diff --git a/src/components/quotes/actions.ts b/src/components/quotes/actions.ts
index 450ec08e..57486250 100644
--- a/src/components/quotes/actions.ts
+++ b/src/components/quotes/actions.ts
@@ -187,6 +187,21 @@ export async function getQuoteById(id: string): Promise<{
       };
     }
 
+    // 디버깅: API 응답 구조 확인
+    console.log('[QuoteActions] getQuoteById raw data:', JSON.stringify({
+      client_name: result.data.client_name,
+      client: result.data.client,
+      calculation_inputs: result.data.calculation_inputs,
+      items: result.data.items?.map((item: Record<string, unknown>) => ({
+        id: item.id,
+        item_name: item.item_name,
+        calculated_quantity: item.calculated_quantity,
+        base_quantity: item.base_quantity,
+        unit_price: item.unit_price,
+        total_price: item.total_price,
+      })),
+    }, null, 2));
+
     return {
       success: true,
       data: transformApiToFrontend(result.data),
@@ -201,11 +216,13 @@ export async function getQuoteById(id: string): Promise<{
 }
 
 // ===== 견적 등록 =====
+// 주의: 호출자가 transformFormDataToApi 또는 transformFrontendToApi로 변환한 데이터를 전달해야 함
 export async function createQuote(
-  data: Partial<Quote>
+  data: Record<string, unknown>
 ): Promise<{ success: boolean; data?: Quote; error?: string; __authError?: boolean }> {
   try {
-    const apiData = transformFrontendToApi(data);
+    // 이미 변환된 API 형식 데이터를 그대로 사용
+    const apiData = data;
 
     console.log('[QuoteActions] POST quote request:', apiData);
 
@@ -255,12 +272,14 @@ export async function createQuote(
 }
 
 // ===== 견적 수정 =====
+// 주의: 호출자가 transformFormDataToApi 또는 transformFrontendToApi로 변환한 데이터를 전달해야 함
 export async function updateQuote(
   id: string,
-  data: Partial<Quote>
+  data: Record<string, unknown>
 ): Promise<{ success: boolean; data?: Quote; error?: string; __authError?: boolean }> {
   try {
-    const apiData = transformFrontendToApi(data);
+    // 이미 변환된 API 형식 데이터를 그대로 사용
+    const apiData = data;
 
     console.log('[QuoteActions] PUT quote request:', apiData);
 
@@ -754,6 +773,190 @@ export async function sendQuoteKakao(
   }
 }
 
+// ===== 완제품(FG) 목록 조회 =====
+export interface FinishedGoods {
+  id: number;
+  item_code: string;
+  item_name: string;
+  item_category: string;
+  specification?: string;
+  unit?: string;
+}
+
+export async function getFinishedGoods(category?: string): Promise<{
+  success: boolean;
+  data: FinishedGoods[];
+  error?: string;
+  __authError?: boolean;
+}> {
+  try {
+    const searchParams = new URLSearchParams();
+    searchParams.set('item_type', 'FG');
+    if (category) {
+      searchParams.set('item_category', category);
+    }
+    searchParams.set('size', '1000'); // 전체 조회
+
+    const url = `${process.env.NEXT_PUBLIC_API_URL}/api/v1/items?${searchParams.toString()}`;
+
+    console.log('[QuoteActions] GET finished goods:', url);
+
+    const { response, error } = await serverFetch(url, {
+      method: 'GET',
+    });
+
+    if (error) {
+      return {
+        success: false,
+        data: [],
+        error: error.message,
+        __authError: error.code === 'UNAUTHORIZED',
+      };
+    }
+
+    if (!response) {
+      return {
+        success: false,
+        data: [],
+        error: '완제품 목록 조회에 실패했습니다.',
+      };
+    }
+
+    if (!response.ok) {
+      console.warn('[QuoteActions] GET finished goods error:', response.status);
+      return {
+        success: false,
+        data: [],
+        error: `API 오류: ${response.status}`,
+      };
+    }
+
+    const result = await response.json();
+
+    if (!result.success) {
+      return {
+        success: false,
+        data: [],
+        error: result.message || '완제품 목록 조회에 실패했습니다.',
+      };
+    }
+
+    // API 응답: { success, data: { data: [], ... } } 또는 { success, data: [] }
+    const items = result.data?.data || result.data || [];
+
+    return {
+      success: true,
+      data: items.map((item: Record<string, unknown>) => ({
+        id: item.id,
+        item_code: item.code as string,        // Item 모델은 'code' 필드 사용
+        item_name: item.name as string,        // Item 모델은 'name' 필드 사용
+        item_category: (item.item_category as string) || '',
+        specification: item.specification as string | undefined,
+        unit: item.unit as string | undefined,
+      })),
+    };
+  } catch (error) {
+    console.error('[QuoteActions] getFinishedGoods error:', error);
+    return {
+      success: false,
+      data: [],
+      error: '서버 오류가 발생했습니다.',
+    };
+  }
+}
+
+// ===== BOM 기반 자동 견적 산출 (다건) =====
+export interface BomCalculateItem {
+  finished_goods_code: string;
+  // React 필드명 (camelCase) - API가 내부에서 W0/H0 등으로 변환
+  openWidth: number;
+  openHeight: number;
+  quantity?: number;
+  guideRailType?: string;
+  motorPower?: string;
+  controller?: string;
+  wingSize?: number;
+  inspectionFee?: number;
+}
+
+export interface BomCalculationResult {
+  finished_goods: {
+    code: string;
+    name: string;
+    item_category?: string;
+  };
+  items: Array<{
+    item_code: string;
+    item_name: string;
+    specification?: string;
+    unit?: string;
+    quantity: number;
+    unit_price: number;
+    total_price: number;
+    process_group?: string;
+  }>;
+  subtotals: Record<string, { name?: string; count?: number; subtotal?: number } | number>;
+  grand_total: number;
+}
+
+export async function calculateBomBulk(items: BomCalculateItem[]): Promise<{
+  success: boolean;
+  data: BomCalculationResult[];
+  error?: string;
+  __authError?: boolean;
+}> {
+  try {
+    const url = `${process.env.NEXT_PUBLIC_API_URL}/api/v1/quotes/calculate/bom/bulk`;
+
+    console.log('[QuoteActions] POST calculate BOM bulk:', { items });
+
+    const { response, error } = await serverFetch(url, {
+      method: 'POST',
+      body: JSON.stringify({ items }),
+    });
+
+    if (error) {
+      return {
+        success: false,
+        data: [],
+        error: error.message,
+        __authError: error.code === 'UNAUTHORIZED',
+      };
+    }
+
+    if (!response) {
+      return {
+        success: false,
+        data: [],
+        error: 'BOM 계산에 실패했습니다.',
+      };
+    }
+
+    const result = await response.json();
+    console.log('[QuoteActions] POST calculate BOM bulk response:', result);
+
+    if (!response.ok || !result.success) {
+      return {
+        success: false,
+        data: [],
+        error: result.message || 'BOM 계산에 실패했습니다.',
+      };
+    }
+
+    return {
+      success: true,
+      data: result.data || [],
+    };
+  } catch (error) {
+    console.error('[QuoteActions] calculateBomBulk error:', error);
+    return {
+      success: false,
+      data: [],
+      error: '서버 오류가 발생했습니다.',
+    };
+  }
+}
+
 // ===== 견적 요약 통계 =====
 export async function getQuotesSummary(params?: {
   dateFrom?: string;
@@ -826,4 +1029,49 @@ export async function getQuotesSummary(params?: {
       error: '서버 오류가 발생했습니다.',
     };
   }
+}
+
+// ===== 현장명 목록 조회 (자동완성용) =====
+export async function getSiteNames(): Promise<{
+  success: boolean;
+  data: string[];
+  error?: string;
+  __authError?: boolean;
+}> {
+  try {
+    // 기존 견적에서 현장명 수집 (중복 제거)
+    const listResult = await getQuotes({
+      perPage: 500,
+    });
+
+    if (!listResult.success) {
+      return {
+        success: false,
+        data: [],
+        error: listResult.error,
+        __authError: listResult.__authError,
+      };
+    }
+
+    // 현장명 추출 및 중복 제거
+    const siteNames = Array.from(
+      new Set(
+        listResult.data
+          .map(q => q.siteName)
+          .filter((name): name is string => !!name && name.trim() !== '')
+      )
+    ).sort();
+
+    return {
+      success: true,
+      data: siteNames,
+    };
+  } catch (error) {
+    console.error('[QuoteActions] getSiteNames error:', error);
+    return {
+      success: false,
+      data: [],
+      error: '서버 오류가 발생했습니다.',
+    };
+  }
 }
\ No newline at end of file
diff --git a/src/components/quotes/types.ts b/src/components/quotes/types.ts
index 392f9c96..3de2efeb 100644
--- a/src/components/quotes/types.ts
+++ b/src/components/quotes/types.ts
@@ -33,6 +33,29 @@ export const QUOTE_STATUS_COLORS: Record<QuoteStatus, string> = {
   converted: 'bg-indigo-100 text-indigo-800',
 };
 
+// ===== 날짜 형식 변환 헬퍼 =====
+/**
+ * API 날짜 문자열을 HTML date input용 YYYY-MM-DD 형식으로 변환
+ * 지원 형식: ISO 8601, datetime string, date only
+ */
+function formatDateForInput(dateStr: string | null | undefined): string {
+  if (!dateStr) return '';
+
+  // 이미 YYYY-MM-DD 형식인 경우
+  if (/^\d{4}-\d{2}-\d{2}$/.test(dateStr)) {
+    return dateStr;
+  }
+
+  // ISO 8601 또는 datetime 형식 (2025-01-06T00:00:00.000Z, 2025-01-06 00:00:00)
+  const date = new Date(dateStr);
+  if (isNaN(date.getTime())) {
+    return ''; // 유효하지 않은 날짜
+  }
+
+  // YYYY-MM-DD 형식으로 변환
+  return date.toISOString().split('T')[0];
+}
+
 // ===== 제품 카테고리 =====
 export type ProductCategory = 'screen' | 'steel';
 
@@ -71,6 +94,7 @@ export interface Quote {
   managerContact?: string;
   productCategory: ProductCategory;
   quantity: number;
+  unitSymbol?: string;  // 단위 (개소, set 등)
   supplyAmount: number;
   taxAmount: number;
   totalAmount: number;
@@ -83,6 +107,8 @@ export interface Quote {
   deliveryLocation?: string;
   paymentTerms?: string;
   items: QuoteItem[];
+  calculationInputs?: CalculationInputs;  // 자동산출 입력값 (폼 복원용)
+  bomMaterials?: BomMaterial[];  // BOM 자재 목록
   createdAt: string;
   updatedAt: string;
   createdBy?: string;
@@ -92,6 +118,42 @@ export interface Quote {
 }
 
 // ===== API 응답 타입 =====
+// 자동산출 입력값 타입
+export interface CalculationInputItem {
+  productCategory?: string;
+  productName?: string;
+  openWidth?: string;
+  openHeight?: string;
+  guideRailType?: string;
+  motorPower?: string;
+  controller?: string;
+  wingSize?: string;
+  inspectionFee?: number;
+  floor?: string;
+  code?: string;
+  quantity?: number;  // 수량
+}
+
+export interface CalculationInputs {
+  items?: CalculationInputItem[];
+}
+
+// BOM 자재 항목 타입 (API 응답)
+export interface BomMaterialApiData {
+  item_index: number;
+  finished_goods_code: string;
+  item_code: string;
+  item_name: string;
+  item_type: string;       // 품목 유형 (RM: 원자재, SM: 부자재, CS: 소모품)
+  item_category: string;   // 품목 카테고리
+  specification: string;
+  unit: string;
+  quantity: number;
+  unit_price: number;
+  total_price: number;
+  process_type: string;    // 공정 유형
+}
+
 export interface QuoteApiData {
   id: number;
   quote_number: string;
@@ -104,42 +166,72 @@ export interface QuoteApiData {
   };
   site_name: string | null;
   site_code: string | null;
-  manager_name: string | null;
-  manager_contact: string | null;
+  // 담당자/연락처 - API 실제 필드명과 레거시 호환
+  manager?: string | null;           // API 실제 필드명
+  contact?: string | null;           // API 실제 필드명
+  manager_name?: string | null;      // 레거시 호환
+  manager_contact?: string | null;   // 레거시 호환
   product_category: 'screen' | 'steel';
   quantity: number;
+  unit_symbol?: string | null;  // 단위 (개소, set 등)
   supply_amount: string | number;
   tax_amount: string | number;
   total_amount: string | number;
   status: QuoteStatus;
   current_revision: number;
   is_final: boolean;
-  description: string | null;
-  valid_until: string | null;
-  delivery_date: string | null;
-  delivery_location: string | null;
-  payment_terms: string | null;
+  // 비고/납기일 - API 실제 필드명과 레거시 호환
+  remarks?: string | null;           // API 실제 필드명
+  completion_date?: string | null;   // API 실제 필드명
+  description?: string | null;       // 레거시 호환
+  valid_until?: string | null;
+  delivery_date?: string | null;     // 레거시 호환
+  delivery_location?: string | null;
+  payment_terms?: string | null;
+  calculation_inputs?: CalculationInputs | null;
   items?: QuoteItemApiData[];
+  bom_materials?: BomMaterialApiData[];  // BOM 자재 목록
   created_at: string;
   updated_at: string;
   created_by: number | null;
   updated_by: number | null;
   finalized_at: string | null;
   finalized_by: number | null;
+  // 관계 데이터 (with 로드 시)
+  creator?: {
+    id: number;
+    name: string;
+  } | null;
+  updater?: {
+    id: number;
+    name: string;
+  } | null;
+  finalizer?: {
+    id: number;
+    name: string;
+  } | null;
 }
 
 export interface QuoteItemApiData {
   id: number;
   quote_id: number;
-  product_id: number | null;
-  product_name: string;
+  // 품목 정보 (API는 item_name/item_code 사용)
+  item_id?: number | null;
+  item_code?: string | null;
+  item_name: string;
+  product_id?: number | null;  // 레거시 호환
+  product_name?: string;       // 레거시 호환
   specification: string | null;
   unit: string | null;
-  quantity: number;
+  // 수량/금액 (API는 calculated_quantity, total_price 사용)
+  base_quantity?: number;
+  calculated_quantity?: number;
+  quantity?: number;  // 레거시 호환
   unit_price: string | number;
-  supply_amount: string | number;
-  tax_amount: string | number;
-  total_amount: string | number;
+  total_price?: string | number;
+  supply_amount?: string | number;  // 레거시 호환
+  tax_amount?: string | number;     // 레거시 호환
+  total_amount?: string | number;   // 레거시 호환
   sort_order: number;
   note: string | null;
 }
@@ -163,44 +255,57 @@ export function transformApiToFrontend(apiData: QuoteApiData): Quote {
     clientName: apiData.client?.name || apiData.client_name || '',
     siteName: apiData.site_name || undefined,
     siteCode: apiData.site_code || undefined,
-    managerName: apiData.manager_name || undefined,
-    managerContact: apiData.manager_contact || undefined,
+    // API 실제 필드명(manager, contact) 우선, 레거시 필드명(manager_name, manager_contact) 폴백
+    managerName: apiData.manager || apiData.manager_name || undefined,
+    managerContact: apiData.contact || apiData.manager_contact || undefined,
     productCategory: apiData.product_category,
     quantity: apiData.quantity || 0,
+    unitSymbol: apiData.unit_symbol || undefined,
     supplyAmount: parseFloat(String(apiData.supply_amount)) || 0,
     taxAmount: parseFloat(String(apiData.tax_amount)) || 0,
     totalAmount: parseFloat(String(apiData.total_amount)) || 0,
     status: apiData.status,
     currentRevision: apiData.current_revision || 0,
     isFinal: apiData.is_final || false,
-    description: apiData.description || undefined,
+    // API 실제 필드명(remarks, completion_date) 우선, 레거시 필드명(description, delivery_date) 폴백
+    description: apiData.remarks || apiData.description || undefined,
     validUntil: apiData.valid_until || undefined,
-    deliveryDate: apiData.delivery_date || undefined,
+    deliveryDate: apiData.completion_date || apiData.delivery_date || undefined,
     deliveryLocation: apiData.delivery_location || undefined,
     paymentTerms: apiData.payment_terms || undefined,
     items: (apiData.items || []).map(transformItemApiToFrontend),
+    calculationInputs: apiData.calculation_inputs || undefined,  // 자동산출 입력값 포함
+    bomMaterials: (apiData.bom_materials || []).map(transformBomMaterialApiToFrontend),  // BOM 자재 목록
     createdAt: apiData.created_at,
     updatedAt: apiData.updated_at,
-    createdBy: apiData.created_by ? String(apiData.created_by) : undefined,
-    updatedBy: apiData.updated_by ? String(apiData.updated_by) : undefined,
+    createdBy: apiData.creator?.name || undefined,
+    updatedBy: apiData.updater?.name || undefined,
     finalizedAt: apiData.finalized_at || undefined,
-    finalizedBy: apiData.finalized_by ? String(apiData.finalized_by) : undefined,
+    finalizedBy: apiData.finalizer?.name || undefined,
   };
 }
 
 export function transformItemApiToFrontend(apiData: QuoteItemApiData): QuoteItem {
+  // API 필드 우선순위: item_name > product_name
+  const productName = apiData.item_name || apiData.product_name || '';
+  // API 필드 우선순위: calculated_quantity > quantity > base_quantity (정수로 변환)
+  const rawQuantity = apiData.calculated_quantity ?? apiData.quantity ?? apiData.base_quantity ?? 0;
+  const quantity = Math.round(rawQuantity);
+  // API 필드 우선순위: total_price > total_amount > supply_amount
+  const totalAmount = parseFloat(String(apiData.total_price ?? apiData.total_amount ?? apiData.supply_amount ?? 0)) || 0;
+
   return {
     id: String(apiData.id),
     quoteId: String(apiData.quote_id),
-    productId: apiData.product_id ? String(apiData.product_id) : undefined,
-    productName: apiData.product_name,
+    productId: apiData.item_id ? String(apiData.item_id) : (apiData.product_id ? String(apiData.product_id) : undefined),
+    productName,
     specification: apiData.specification || undefined,
     unit: apiData.unit || undefined,
-    quantity: apiData.quantity || 0,
+    quantity,
     unitPrice: parseFloat(String(apiData.unit_price)) || 0,
-    supplyAmount: parseFloat(String(apiData.supply_amount)) || 0,
+    supplyAmount: totalAmount,  // total_price를 supplyAmount로 사용
     taxAmount: parseFloat(String(apiData.tax_amount)) || 0,
-    totalAmount: parseFloat(String(apiData.total_amount)) || 0,
+    totalAmount,
     sortOrder: apiData.sort_order || 0,
     note: apiData.note || undefined,
   };
@@ -286,6 +391,7 @@ export interface QuoteFormItem {
   motorPower: string;
   controller: string;
   quantity: number;
+  unit?: string;  // 품목 단위
   wingSize: string;
   inspectionFee: number;
   unitPrice?: number;
@@ -293,6 +399,55 @@ export interface QuoteFormItem {
   installType?: string;
 }
 
+// BOM 자재 항목 (프론트엔드용)
+export interface BomMaterial {
+  itemIndex: number;
+  finishedGoodsCode: string;
+  itemCode: string;
+  itemName: string;
+  itemType: string;       // 품목 유형 (RM: 원자재, SM: 부자재, CS: 소모품)
+  itemCategory: string;   // 품목 카테고리
+  specification: string;
+  unit: string;
+  quantity: number;
+  unitPrice: number;
+  totalPrice: number;
+  processType: string;    // 공정 유형
+}
+
+// BOM 계산 결과 아이템 타입
+export interface BomCalculationResultItem {
+  item_code: string;
+  item_name: string;
+  specification?: string;
+  unit?: string;
+  quantity: number;      // 1개당 BOM 수량 (base_quantity)
+  unit_price: number;
+  total_price: number;
+  process_group?: string;
+}
+
+// BOM 계산 결과 타입
+export interface BomCalculationResult {
+  finished_goods: {
+    code: string;
+    name: string;
+    item_category?: string;
+  };
+  items: BomCalculationResultItem[];
+  subtotals: Record<string, { name?: string; count?: number; subtotal?: number } | number>;
+  grand_total: number;
+}
+
+// 견적 산출 결과 타입
+export interface CalculationResults {
+  summary: { grand_total: number };
+  items: Array<{
+    index: number;
+    result: BomCalculationResult;
+  }>;
+}
+
 export interface QuoteFormData {
   id?: string;
   registrationDate: string;
@@ -304,65 +459,343 @@ export interface QuoteFormData {
   contact: string;
   dueDate: string;
   remarks: string;
+  unitSymbol?: string;  // 선택한 제품(모델)의 단위 (개소, set 등)
   items: QuoteFormItem[];
+  bomMaterials?: BomMaterial[];  // BOM 자재 목록
+  calculationResults?: CalculationResults;  // 견적 산출 결과 (저장 시 BOM 자재 변환용)
 }
 
 // ===== Quote → QuoteFormData 변환 =====
 export function transformQuoteToFormData(quote: Quote): QuoteFormData {
+  const calcInputs = quote.calculationInputs?.items || [];
+
+  // BOM 자재(quote.items)의 총 금액 계산
+  const totalBomAmount = quote.items.reduce((sum, item) => sum + (item.totalAmount || 0), 0);
+  const itemCount = calcInputs.length || 1;
+  const amountPerItem = Math.round(totalBomAmount / itemCount);
+
+  // 디버깅 로그
+  console.log('[transformQuoteToFormData] quote.calculationInputs:', JSON.stringify(quote.calculationInputs, null, 2));
+  console.log('[transformQuoteToFormData] calcInputs:', JSON.stringify(calcInputs, null, 2));
+  console.log('[transformQuoteToFormData] quote.items.length:', quote.items.length);
+  console.log('[transformQuoteToFormData] totalBomAmount:', totalBomAmount, 'amountPerItem:', amountPerItem);
+
   return {
     id: quote.id,
-    registrationDate: quote.registrationDate,
+    registrationDate: formatDateForInput(quote.registrationDate),
     writer: quote.createdBy || '',
     clientId: quote.clientId,
     clientName: quote.clientName,
     siteName: quote.siteName || '',
     manager: quote.managerName || '',
     contact: quote.managerContact || '',
-    dueDate: quote.deliveryDate || '',
+    dueDate: formatDateForInput(quote.deliveryDate),
     remarks: quote.description || '',
-    items: quote.items.map((item) => ({
-      id: item.id,
-      floor: '',
-      code: '',
-      productCategory: '',
-      productName: item.productName,
-      openWidth: '',
-      openHeight: '',
-      guideRailType: '',
-      motorPower: '',
-      controller: '',
-      quantity: item.quantity,
-      wingSize: '',
-      inspectionFee: item.unitPrice || 0,
-      unitPrice: item.unitPrice,
-      totalAmount: item.totalAmount,
-    })),
+    unitSymbol: quote.unitSymbol,  // 단위 (EA, 개소 등)
+    // calculation_inputs.items가 있으면 그것으로 items 복원 (견적 탭 = 사용자가 입력한 수)
+    // 없으면 quote.items 사용 (레거시 호환)
+    items: calcInputs.length > 0
+      ? calcInputs.map((calcInput, index) => ({
+          id: `temp-${index}`,  // 임시 ID (새로 저장 시 갱신됨)
+          floor: calcInput.floor || '',
+          code: calcInput.code || '',
+          productCategory: calcInput.productCategory || '',
+          productName: calcInput.productName || '',
+          openWidth: calcInput.openWidth || '',
+          openHeight: calcInput.openHeight || '',
+          guideRailType: calcInput.guideRailType || '',
+          motorPower: calcInput.motorPower || '',
+          controller: calcInput.controller || '',
+          quantity: calcInput.quantity || 1,
+          unit: undefined,  // BOM 자재에서 가져올 수 있지만 입력 시점에는 없음
+          wingSize: calcInput.wingSize || '50',
+          inspectionFee: calcInput.inspectionFee || 50000,
+          // 금액은 BOM 자재 총합을 탭 수로 나눠서 배분
+          unitPrice: Math.round(amountPerItem / (calcInput.quantity || 1)),
+          totalAmount: amountPerItem,
+        }))
+      : quote.items.map((item, index) => {
+          const spec = item.specification || '';
+          // specification에서 width x height 추출 (예: "3000x2500mm")
+          const sizeMatch = spec.match(/(\d+)\s*x\s*(\d+)/i);
+
+          return {
+            id: item.id,
+            floor: '',
+            code: '',
+            productCategory: '',
+            productName: item.productName,
+            openWidth: sizeMatch ? sizeMatch[1] : '',
+            openHeight: sizeMatch ? sizeMatch[2] : '',
+            guideRailType: '',
+            motorPower: '',
+            controller: '',
+            quantity: item.quantity || 1,
+            unit: item.unit,
+            wingSize: '50',
+            inspectionFee: item.unitPrice || 50000,
+            unitPrice: item.unitPrice,
+            totalAmount: item.totalAmount,
+          };
+        }),
+    // BOM 자재 목록:
+    // - calcInputs가 있으면: quote.items에 BOM 자재가 저장되어 있음 (quote_items 테이블)
+    // - calcInputs가 없으면: quote.bomMaterials 사용 (별도 bom_materials 필드가 있는 경우)
+    bomMaterials: calcInputs.length > 0
+      ? quote.items.map((item, index) => ({
+          itemIndex: index,
+          finishedGoodsCode: '',
+          itemCode: item.productId || item.id || '',
+          itemName: item.productName,
+          itemType: '',
+          itemCategory: '',
+          specification: item.specification || '',
+          unit: item.unit || '',
+          quantity: item.quantity,
+          unitPrice: item.unitPrice,
+          totalPrice: item.totalAmount,
+          processType: '',
+        }))
+      : quote.bomMaterials,
+  };
+}
+
+// ===== BOM 자재 변환 함수 =====
+export function transformBomMaterialApiToFrontend(apiData: BomMaterialApiData): BomMaterial {
+  return {
+    itemIndex: apiData.item_index,
+    finishedGoodsCode: apiData.finished_goods_code,
+    itemCode: apiData.item_code,
+    itemName: apiData.item_name,
+    itemType: apiData.item_type,           // 품목 유형 (RM, SM, CS)
+    itemCategory: apiData.item_category,   // 품목 카테고리
+    specification: apiData.specification,
+    unit: apiData.unit,
+    quantity: apiData.quantity,
+    unitPrice: apiData.unit_price,
+    totalPrice: apiData.total_price,
+    processType: apiData.process_type,     // 공정 유형
+  };
+}
+
+// ===== QuoteApiData → QuoteFormData 변환 (calculation_inputs + bom_materials 포함) =====
+export function transformApiDataToFormData(apiData: QuoteApiData): QuoteFormData {
+  const calcInputs = apiData.calculation_inputs?.items || [];
+
+  // BOM 자재(apiData.items)의 총 금액 계산
+  const totalBomAmount = (apiData.items || []).reduce((sum, item) => {
+    const itemTotal = parseFloat(String(item.total_price ?? item.total_amount ?? 0)) || 0;
+    return sum + itemTotal;
+  }, 0);
+  const itemCount = calcInputs.length || 1;
+  const amountPerItem = Math.round(totalBomAmount / itemCount);
+
+  console.log('[transformApiDataToFormData] totalBomAmount:', totalBomAmount, 'itemCount:', itemCount, 'amountPerItem:', amountPerItem);
+
+  return {
+    id: String(apiData.id),
+    registrationDate: formatDateForInput(apiData.registration_date),
+    writer: apiData.creator?.name || '',
+    clientId: apiData.client_id ? String(apiData.client_id) : '',
+    clientName: apiData.client?.name || apiData.client_name || '',
+    siteName: apiData.site_name || '',
+    // API 실제 필드명(manager, contact) 우선, 레거시 필드명(manager_name, manager_contact) 폴백
+    manager: apiData.manager || apiData.manager_name || '',
+    contact: apiData.contact || apiData.manager_contact || '',
+    // API 실제 필드명(completion_date, remarks) 우선, 레거시 필드명(delivery_date, description) 폴백
+    // 날짜는 YYYY-MM-DD 형식으로 변환
+    dueDate: formatDateForInput(apiData.completion_date || apiData.delivery_date),
+    remarks: apiData.remarks || apiData.description || '',
+    unitSymbol: apiData.unit_symbol || undefined,  // 단위 (EA, 개소 등)
+    // calculation_inputs.items가 있으면 그것으로 items 복원 (견적 탭 = 사용자가 입력한 수)
+    // 없으면 apiData.items 사용 (레거시 호환)
+    items: calcInputs.length > 0
+      ? calcInputs.map((calcInput, index) => ({
+          id: `temp-${index}`,  // 임시 ID (새로 저장 시 갱신됨)
+          floor: calcInput.floor || '',
+          code: calcInput.code || '',
+          productCategory: calcInput.productCategory || '',
+          productName: calcInput.productName || '',
+          openWidth: calcInput.openWidth || '',
+          openHeight: calcInput.openHeight || '',
+          guideRailType: calcInput.guideRailType || '',
+          motorPower: calcInput.motorPower || '',
+          controller: calcInput.controller || '',
+          quantity: calcInput.quantity || 1,
+          unit: undefined,  // BOM 자재에서 가져올 수 있지만 입력 시점에는 없음
+          wingSize: calcInput.wingSize || '50',
+          inspectionFee: calcInput.inspectionFee || 50000,
+          // 금액은 BOM 자재 총합을 탭 수로 나눠서 배분
+          unitPrice: Math.round(amountPerItem / (calcInput.quantity || 1)),
+          totalAmount: amountPerItem,
+        }))
+      : (apiData.items || []).map((item, index) => {
+          const spec = item.specification || '';
+          // specification에서 width x height 추출 (예: "3000x2500mm")
+          const sizeMatch = spec.match(/(\d+)\s*x\s*(\d+)/i);
+          // 수량: calculated_quantity > base_quantity > quantity 순으로 확인
+          const itemQuantity = item.calculated_quantity ?? item.base_quantity ?? item.quantity ?? 1;
+
+          return {
+            id: String(item.id),
+            floor: '',
+            code: '',
+            productCategory: '',
+            productName: item.product_name || '',
+            openWidth: sizeMatch ? sizeMatch[1] : '',
+            openHeight: sizeMatch ? sizeMatch[2] : '',
+            guideRailType: '',
+            motorPower: '',
+            controller: '',
+            quantity: Math.round(itemQuantity),
+            unit: item.unit || undefined,
+            wingSize: '50',
+            inspectionFee: 50000,
+            unitPrice: parseFloat(String(item.unit_price)) || 0,
+            totalAmount: parseFloat(String(item.total_amount)) || 0,
+          };
+        }),
+    // BOM 자재 목록 변환
+    bomMaterials: (apiData.bom_materials || []).map(transformBomMaterialApiToFrontend),
   };
 }
 
 // ===== QuoteFormData → API 요청 데이터 변환 =====
 export function transformFormDataToApi(formData: QuoteFormData): Record<string, unknown> {
-  return {
+  // calculationResults가 있으면 BOM 자재 기반으로 items 생성
+  // 없으면 완제품 기준으로 items 생성 (기존 로직)
+  let itemsData: Array<{
+    item_name: string;
+    item_code: string;
+    specification: string | null;
+    unit: string;
+    quantity: number;
+    base_quantity: number;
+    calculated_quantity: number;
+    unit_price: number;
+    total_price: number;
+    sort_order: number;
+    note: string | null;
+    item_index?: number;
+    finished_goods_code?: string;
+    formula_category?: string;
+  }> = [];
+
+  if (formData.calculationResults && formData.calculationResults.items.length > 0) {
+    // BOM 자재 기반 items 생성
+    let sortOrder = 1;
+
+    formData.calculationResults.items.forEach((calcItem) => {
+      const formItem = formData.items[calcItem.index];
+      const orderQuantity = formItem?.quantity || 1;  // 주문 수량
+
+      calcItem.result.items.forEach((bomItem) => {
+        const baseQuantity = bomItem.quantity;  // 1개당 BOM 수량
+        const calculatedQuantity = bomItem.unit === 'EA'
+          ? Math.round(baseQuantity * orderQuantity)
+          : parseFloat((baseQuantity * orderQuantity).toFixed(2));
+        const totalPrice = bomItem.unit_price * calculatedQuantity;
+
+        itemsData.push({
+          item_name: bomItem.item_name,
+          item_code: bomItem.item_code,
+          specification: bomItem.specification || null,
+          unit: bomItem.unit || 'EA',
+          quantity: orderQuantity,  // 주문 수량
+          base_quantity: baseQuantity,  // 1개당 BOM 수량
+          calculated_quantity: calculatedQuantity,  // base × 주문 수량
+          unit_price: bomItem.unit_price,
+          total_price: totalPrice,
+          sort_order: sortOrder++,
+          note: `${formItem?.floor || ''} ${formItem?.code || ''}`.trim() || null,
+          item_index: calcItem.index,
+          finished_goods_code: calcItem.result.finished_goods.code,
+          formula_category: bomItem.process_group || undefined,
+        });
+      });
+    });
+  } else {
+    // 기존 로직: 완제품 기준 items 생성
+    itemsData = formData.items.map((item, index) => {
+      const unitPrice = item.unitPrice || item.inspectionFee || 0;
+      const supplyAmount = unitPrice * item.quantity;
+
+      return {
+        item_name: item.productName,
+        item_code: item.productName,
+        specification: item.openWidth && item.openHeight
+          ? `${item.openWidth}x${item.openHeight}mm`
+          : null,
+        unit: item.unit || '개소',  // 품목의 단위 사용, 없으면 '개소'
+        quantity: item.quantity,
+        base_quantity: 1,  // 완제품은 1개당 1개
+        calculated_quantity: item.quantity,
+        unit_price: unitPrice,
+        total_price: supplyAmount,
+        sort_order: index + 1,
+        note: `${item.floor || ''} ${item.code || ''}`.trim() || null,
+      };
+    });
+  }
+
+  // 총액 계산
+  const totalSupply = itemsData.reduce((sum, item) => sum + item.total_price, 0);
+  const totalTax = Math.round(totalSupply * 0.1);
+  const grandTotal = totalSupply + totalTax;
+
+  // 자동산출 입력값 저장 (나중에 폼 복원용)
+  const calculationInputs: CalculationInputs = {
+    items: formData.items.map(item => ({
+      productCategory: item.productCategory,
+      productName: item.productName,
+      openWidth: item.openWidth,
+      openHeight: item.openHeight,
+      guideRailType: item.guideRailType,
+      motorPower: item.motorPower,
+      controller: item.controller,
+      wingSize: item.wingSize,
+      inspectionFee: item.inspectionFee,
+      floor: item.floor,
+      code: item.code,
+      quantity: item.quantity,  // 수량도 저장
+    })),
+  };
+
+  const result = {
     registration_date: formData.registrationDate,
+    author: formData.writer || null,  // writer → author 필드 매핑
     client_id: formData.clientId ? parseInt(formData.clientId, 10) : null,
     client_name: formData.clientName,
     site_name: formData.siteName || null,
-    manager_name: formData.manager || null,
-    manager_contact: formData.contact || null,
-    delivery_date: formData.dueDate || null,
-    description: formData.remarks || null,
-    product_category: 'screen', // 기본값
+    manager: formData.manager || null,
+    contact: formData.contact || null,
+    completion_date: formData.dueDate || null,
+    remarks: formData.remarks || null,
+    product_category: formData.items[0]?.productCategory?.toLowerCase() || 'screen',
     quantity: formData.items.reduce((sum, item) => sum + item.quantity, 0),
-    items: formData.items.map((item, index) => ({
-      product_name: item.productName,
-      specification: `${item.openWidth}x${item.openHeight}mm`,
-      quantity: item.quantity,
-      unit_price: item.inspectionFee || item.unitPrice || 0,
-      supply_amount: (item.inspectionFee || item.unitPrice || 0) * item.quantity,
-      tax_amount: Math.round((item.inspectionFee || item.unitPrice || 0) * item.quantity * 0.1),
-      total_amount: Math.round((item.inspectionFee || item.unitPrice || 0) * item.quantity * 1.1),
-      sort_order: index + 1,
-      note: `${item.floor} ${item.code}`.trim() || null,
-    })),
+    unit_symbol: formData.unitSymbol || '개소',  // 선택한 제품의 단위 또는 기본값
+    total_amount: grandTotal,
+    calculation_inputs: calculationInputs,
+    items: itemsData,
   };
+
+  // 디버그: 전송되는 데이터 확인
+  console.log('[transformFormDataToApi] 전송 데이터:', JSON.stringify({
+    author: result.author,
+    manager: result.manager,
+    contact: result.contact,
+    site_name: result.site_name,
+    completion_date: result.completion_date,
+    remarks: result.remarks,
+    quantity: result.quantity,
+    items_count: result.items?.length,
+    items_sample: result.items?.slice(0, 3).map(i => ({
+      item_name: i.item_name,
+      quantity: i.quantity,
+      base_quantity: i.base_quantity,
+      calculated_quantity: i.calculated_quantity,
+    })),
+  }, null, 2));
+
+  return result;
 }
\ No newline at end of file
diff --git a/src/lib/api/quote.ts b/src/lib/api/quote.ts
index 88b64b46..a7b11331 100644
--- a/src/lib/api/quote.ts
+++ b/src/lib/api/quote.ts
@@ -85,6 +85,64 @@ interface InputSchemaField {
   description?: string;
 }
 
+/**
+ * BOM 계산 요청 (단건)
+ */
+export interface CalculateBomRequest {
+  finished_goods_code: string;  // 완제품 코드
+  input_variables: {
+    W0: number;           // 오픈사이즈 가로 (mm)
+    H0: number;           // 오픈사이즈 세로 (mm)
+    QTY?: number;         // 수량
+    GT?: string;          // 가이드레일 설치 유형 (벽면형/측면형)
+    MP?: string;          // 모터 전원 (220V/380V)
+    CT?: string;          // 연동제어기 (단독/연동)
+    WS?: number;          // 마구리 날개치수
+    INSP?: number;        // 검사비
+  };
+}
+
+/**
+ * BOM 계산 요청 (다건)
+ */
+export interface CalculateBomBulkRequest {
+  items: CalculateBomRequest[];
+}
+
+/**
+ * BOM 계산 결과 항목
+ */
+interface BomResultItem {
+  item_code: string;
+  item_name: string;
+  specification?: string;
+  unit?: string;
+  quantity: number;
+  unit_price: number;
+  total_price: number;
+  process_group?: string;
+}
+
+/**
+ * BOM 계산 결과
+ */
+export interface BomCalculationResult {
+  finished_goods: {
+    code: string;
+    name: string;
+    item_category?: string;
+  };
+  items: BomResultItem[];
+  subtotals: Record<string, number>;
+  grand_total: number;
+  debug_steps?: Array<{
+    step: number;
+    label: string;
+    description: string;
+    data?: Record<string, unknown>;
+  }>;
+}
+
 /**
  * API 응답 공통 형식
  */
@@ -159,6 +217,26 @@ class QuoteApiClient extends ApiClient {
     const query = productCategory ? `?product_category=${productCategory}` : '';
     return this.get<ApiResponse<Record<string, InputSchemaField>>>(`/api/v1/quotes/calculation-schema${query}`);
   }
+
+  /**
+   * BOM 기반 자동 견적 산출 (단건)
+   *
+   * @param request - BOM 산출 요청 파라미터
+   * @returns BOM 계산 결과
+   */
+  async calculateBom(request: CalculateBomRequest): Promise<ApiResponse<BomCalculationResult>> {
+    return this.post<ApiResponse<BomCalculationResult>>('/api/v1/quotes/calculate/bom', request);
+  }
+
+  /**
+   * BOM 기반 자동 견적 산출 (다건)
+   *
+   * @param request - 다건 BOM 산출 요청 파라미터
+   * @returns BOM 계산 결과 배열
+   */
+  async calculateBomBulk(request: CalculateBomBulkRequest): Promise<ApiResponse<BomCalculationResult[]>> {
+    return this.post<ApiResponse<BomCalculationResult[]>>('/api/v1/quotes/calculate/bom/bulk', request);
+  }
 }
 
 // 싱글톤 인스턴스 내보내기