diff --git a/web/templates/index.html b/web/templates/index.html
index f22dfd3..d4a2181 100644
--- a/web/templates/index.html
+++ b/web/templates/index.html
@@ -3953,6 +3953,9 @@ async function renderPricingTab() {
     };
 
     // Collect LOTs to price: from BOM rows (resolved) or from cart
+    // Use cart quantity when available (source of truth); fall back to BOM-computed quantity.
+    const _cartQtyMap = {};
+    cart.forEach(item => { if (item?.lot_name) _cartQtyMap[item.lot_name] = item.quantity; });
     let itemsForPriceLevels = [];
     if (bomRows.length) {
         const seen = new Set();
@@ -3961,13 +3964,13 @@ async function renderPricingTab() {
             const allocs = _getRowAllocations(row).filter(a => a.lot_name && _bomLotValid(a.lot_name) && a.quantity >= 1);
             if (baseLot && !seen.has(baseLot)) {
                 seen.add(baseLot);
-                itemsForPriceLevels.push({ lot_name: baseLot, quantity: row.quantity * _getRowLotQtyPerPN(row) });
+                itemsForPriceLevels.push({ lot_name: baseLot, quantity: _cartQtyMap[baseLot] ?? (row.quantity * _getRowLotQtyPerPN(row)) });
             }
             if (allocs.length) {
                 allocs.forEach(a => {
                     if (!seen.has(a.lot_name)) {
                         seen.add(a.lot_name);
-                        itemsForPriceLevels.push({ lot_name: a.lot_name, quantity: row.quantity * a.quantity });
+                        itemsForPriceLevels.push({ lot_name: a.lot_name, quantity: _cartQtyMap[a.lot_name] ?? (row.quantity * a.quantity) });
                     }
                 });
             }
@@ -4020,6 +4023,8 @@ async function renderPricingTab() {
 
     // ─── Build shared row data (unit prices for display, totals for math) ────
     // Each BOM row is exploded into per-LOT sub-rows; grouped by vendor PN via groupStart/groupSize.
+    const cartQtyMap = {};
+    cart.forEach(item => { if (item?.lot_name) cartQtyMap[item.lot_name] = item.quantity; });
     const _buildRows = () => {
         const result = [];
         const coveredLots = new Set();
@@ -4064,7 +4069,7 @@ async function renderPricingTab() {
             if (baseLot) {
                 const u = _getUnitPrices(priceMap[baseLot]);
                 const lotQty = _getRowLotQtyPerPN(row);
-                const qty = row.quantity * lotQty;
+                const qty = cartQtyMap[baseLot] ?? (row.quantity * lotQty);
                 subRows.push({
                     lotCell: escapeHtml(baseLot), lotText: baseLot, qty,
                     estUnit: u.estUnit > 0 ? u.estUnit : 0,
@@ -4076,7 +4081,7 @@ async function renderPricingTab() {
             }
             allocs.forEach(a => {
                 const u = _getUnitPrices(priceMap[a.lot_name]);
-                const qty = row.quantity * a.quantity;
+                const qty = cartQtyMap[a.lot_name] ?? (row.quantity * a.quantity);
                 subRows.push({
                     lotCell: escapeHtml(a.lot_name), lotText: a.lot_name, qty,
                     estUnit: u.estUnit > 0 ? u.estUnit : 0,