diff --git a/src/utils/productDealMethod.ts b/src/utils/productDealMethod.ts
index 4e10cbc..9e992a3 100644
--- a/src/utils/productDealMethod.ts
+++ b/src/utils/productDealMethod.ts
@@ -439,7 +439,7 @@ export function formatMainMetalReceiveText(weight?: number | null) {
 
 export function calcSellReceivedMetalWeight(
   count?: number | null,
-  product?: ProductUnitSource & { percent_fee_sell?: number | null } | null,
+  product?: ProductUnitSource | null,
 ) {
   const quantity = Number(count ?? 0)
   const unitAmount = Number(product?.amount ?? 0)
@@ -447,9 +447,8 @@ export function calcSellReceivedMetalWeight(
     return 0
   }
 
-  const grossAmount = quantity * unitAmount
-  const feeRate = Number(product?.percent_fee_sell ?? 0)
-  return grossAmount - feeRate * grossAmount
+  // کارمزد محصول تعدادی از ریال است — وزن دریافتی فلز کم نمی‌شود
+  return quantity * unitAmount
 }
 
 export function isCashLikeDealMethod(method?: string | null) {
diff --git a/src/views/base/products/components/DealProduct.vue b/src/views/base/products/components/DealProduct.vue
index c8f7fdb..9c42af0 100644
--- a/src/views/base/products/components/DealProduct.vue
+++ b/src/views/base/products/components/DealProduct.vue
@@ -332,6 +332,7 @@ import { useWalletAssets } from '@/composables/useWalletAssets'
 import { formatProductWalletBalanceText, formatInventoryCardValue, getCashWalletBalance, getProductInventoryQuantity } from '@/utils/productAssets'
 import { resolvePhysicalDeliveryState } from '@/utils/physicalDelivery'
 import { isStoreClosed, resolveStoreClosedNotice } from '@/utils/storeHours'
+import { serviceFeePercentage } from '@/utils/serviceFee'
 
 const catalogProducts = getProductsCatalogRef()
 
@@ -434,8 +435,24 @@ const isBuy = ref<boolean>(true)
 const buyTotalPrice = computed(() => resolveProductTradeBuyUnitPrice(props?.ProductItem))
 
 const sellTotalPrice = computed(() => resolveProductTradeSellUnitPrice(props?.ProductItem))
-const buyFee = computed(() => ((props?.ProductItem?.amount * (props?.ProductItem?.percent_fee_buy ?? 0) * (props?.ProductItem?.price ?? 0)).toFixed(0)))
-const sellFee = computed(() => ((props?.ProductItem?.amount * (props?.ProductItem?.percent_fee_sell ?? 0) * (props?.ProductItem?.sellPrice ?? 0)).toFixed(0)))
+
+/** کارمزد از fee_service_charge_percentage — نه percent_fee_* / اختلاف قیمت */
+function countDealFeeGrams() {
+  const count = Number(form.value?.goldValue ?? 0)
+  const unitWeight = Number(props?.ProductItem?.amount ?? 0)
+  return count * unitWeight * Number(serviceFeePercentage.value)
+}
+
+function countDealFeeRial(piecePrice?: number | null) {
+  const unitWeight = Number(props?.ProductItem?.amount ?? 0)
+  const perGram = unitWeight > 0 ? Number(piecePrice ?? 0) / unitWeight : 0
+  return countDealFeeGrams() * perGram
+}
+
+const buyFee = computed(() => countDealFeeRial(props?.ProductItem?.price).toFixed(0))
+const sellFee = computed(() => countDealFeeRial(props?.ProductItem?.sellPrice).toFixed(0))
+const buyFeeGeram = computed(() => countDealFeeGrams().toFixed(4))
+const sellFeeGeram = computed(() => countDealFeeGrams().toFixed(4))
 
 const buyPagination = ref<TableEngineInput>({
   filters: [{
@@ -458,7 +475,10 @@ const sellPagination = ref<TableEngineInput>({
 })
 
 const finalPrice = computed(() => (form.value?.goldValue * (isBuy.value ? props.ProductItem?.price ?? 0 : props.ProductItem?.sellPrice ?? 0)))
-const payablePrice = computed(() => finalPrice.value)
+const payablePrice = computed(() => {
+  const fee = countDealFeeRial(isBuy.value ? props.ProductItem?.price : props.ProductItem?.sellPrice)
+  return isBuy.value ? finalPrice.value + fee : Math.max(0, finalPrice.value - fee)
+})
 
 const minOrderCash = computed(() => productMinOrderCash(props.ProductItem, isBuy.value))
 const maxOrderCash = computed(() => productMaxOrderCash(props.ProductItem))