diff --git a/api/index.php b/api/index.php
index 6f1686d..e6a5976 100644
--- a/api/index.php
+++ b/api/index.php
@@ -6733,6 +6733,8 @@ function getAllShoppingPrices(PDO $db): void {
                     'estimated_total'       => $est,
                     'estimated_total_label' => $est !== null ? _formatPrice($est, $currency) : null,
                     'from_cache'            => true,
+                    '_resolved_qty'         => $qty,
+                    '_resolved_unit'        => $unit,
                 ]);
                 $total += $est ?? 0;
                 continue;
@@ -6775,6 +6777,8 @@ function getAllShoppingPrices(PDO $db): void {
                     'estimated_total'       => $est,
                     'estimated_total_label' => $est !== null ? _formatPrice($est, $currency) : null,
                     'from_cache'            => false,
+                    '_resolved_qty'         => $qty,
+                    '_resolved_unit'        => $unit,
                 ]);
                 $total += $est ?? 0;
             } else {
@@ -6818,34 +6822,36 @@ function _calcEstimatedTotal(float $pricePerUnit, string $priceUnitLabel, float
     // "pacco 500g" or "mazzo" fall through to the countable path below.
     if ($label === 'kg') {
         $weightKg = 0.0;
-        if ($unit === 'conf' && $defQty > 0 && !empty($pkgUnit)) {
+        if (($unit === 'conf' || $unit === 'pz') && $defQty > 0 && !empty($pkgUnit)) {
+            // Each conf/pz weighs defQty pkgUnit (e.g. defQty=250, pkgUnit='g')
             $sub = strtolower($pkgUnit);
             if ($sub === 'g')  $weightKg = $qty * $defQty / 1000.0;
             elseif ($sub === 'kg') $weightKg = $qty * $defQty;
-            // unknown sub-unit: can't convert → return null
         } elseif ($unit === 'g')  {
             $weightKg = $qty / 1000.0;
         } elseif ($unit === 'kg') {
             $weightKg = $qty;
         }
-        // pz / conf without defQty → assume 1 unit at price_per_unit (e.g. 1kg of fruit)
-        if ($weightKg <= 0) return round($pricePerUnit, 2);
+        // Cannot convert unit to kg → return null instead of misleadingly using
+        // price_per_unit as total (which would inflate estimates for items like
+        // "3 pz Salame" priced at €21.50/kg, returning €21.50 for just ~300g).
+        if ($weightKg <= 0) return null;
         return round($pricePerUnit * $weightKg, 2);
     }
 
     // ── Volume-based price (per liter) ────────────────────────────────────────
     if (in_array($label, ['l', 'lt', 'litre', 'liter', 'litro'])) {
         $volumeL = 0.0;
-        if ($unit === 'conf' && $defQty > 0 && !empty($pkgUnit)) {
+        if (($unit === 'conf' || $unit === 'pz') && $defQty > 0 && !empty($pkgUnit)) {
             $sub = strtolower($pkgUnit);
             if ($sub === 'ml') $volumeL = $qty * $defQty / 1000.0;
             elseif ($sub === 'l') $volumeL = $qty * $defQty;
         } elseif ($unit === 'ml') {
             $volumeL = $qty / 1000.0;
         } elseif ($unit === 'l') {
-            $volumeL = $qty;
+            $volumeL = $qty; 
         }
-        if ($volumeL <= 0) return round($pricePerUnit, 2);
+        if ($volumeL <= 0) return null;
         return round($pricePerUnit * $volumeL, 2);
     }
 
diff --git a/assets/css/style.css b/assets/css/style.css
index 2e01a4b..fc6c758 100644
--- a/assets/css/style.css
+++ b/assets/css/style.css
@@ -1924,6 +1924,11 @@ body {
     white-space: nowrap;
     line-height: 1.25;
 }
+.price-col-qty {
+    font-size: 0.72rem;
+    font-weight: 400;
+    color: #64748b;
+}
 .price-col-unit {
     font-size: 0.62rem;
     color: #94a3b8;
diff --git a/assets/js/app.js b/assets/js/app.js
index 65d1497..d0a215a 100644
--- a/assets/js/app.js
+++ b/assets/js/app.js
@@ -8804,8 +8804,14 @@ function _buildPriceBadgeHTML(entry, sym) {
     const unitLine = unitLabel && entry.price_per_unit != null
         ? `${sym}${entry.price_per_unit.toFixed(2)}/${unitLabel}`
         : '';
+    // Show resolved qty so user can verify the computation
+    const resolvedQty  = entry._resolved_qty  ?? null;
+    const resolvedUnit = entry._resolved_unit ?? null;
+    const qtyLine = (resolvedQty != null && resolvedQty !== 1)
+        ? `${resolvedQty}\u202f${resolvedUnit}`
+        : '';
     const title = entry.source_note || '';
-    return `<div class="price-col-main" title="${escapeHtml(title)}">${mainLabel}</div>`
+    return `<div class="price-col-main" title="${escapeHtml(title)}">${mainLabel}${qtyLine ? `<span class=\"price-col-qty\">\u00a0·\u00a0${escapeHtml(qtyLine)}</span>` : ''}</div>`
          + (unitLine ? `<div class="price-col-unit">${unitLine}</div>` : '');
 }
 
@@ -8935,15 +8941,17 @@ async function fetchAllPrices(forceRefresh = false) {
                 const entry = prices[item.name];
                 const badge = document.getElementById(`price-badge-${idx}`);
                 if (entry && !entry.error && entry.estimated_total != null) {
-                    // Store in client cache keyed by whatever qty the server used
+                    // Store with server-resolved qty/unit for correct cache validation
                     _cachedPrices[item.name] = {
                         ...entry,
-                        _qty:  entry._qty  ?? entry.quantity  ?? 1,
-                        _unit: entry._unit ?? entry.unit      ?? 'conf',
+                        _qty:  entry._resolved_qty  ?? 1,
+                        _unit: entry._resolved_unit ?? 'conf',
                     };
                     if (badge) badge.innerHTML = _buildPriceBadgeHTML(entry, sym);
-                } else if (badge) {
-                    badge.innerHTML = `<span class="price-col-error">–</span>`;
+                } else {
+                    // Item has no estimate (unit conversion impossible or not found)
+                    // Keep any old cache entry but don't update badge to stale value
+                    if (badge) badge.innerHTML = `<span class="price-col-error">–</span>`;
                 }
             });
 
diff --git a/index.html b/index.html
index da7e3b1..bac3820 100644
--- a/index.html
+++ b/index.html
@@ -11,7 +11,7 @@
     <title>EverShelf</title>
     <link rel="manifest" href="manifest.json">
     <link rel="icon" type="image/png" href="assets/img/logo/logo_icon.png">
-    <link rel="stylesheet" href="assets/css/style.css?v=20260507e">
+    <link rel="stylesheet" href="assets/css/style.css?v=20260508a">
     <!-- QuaggaJS for barcode scanning -->
     <script src="https://cdn.jsdelivr.net/npm/@ericblade/quagga2@1.8.4/dist/quagga.min.js"></script>
     <!-- @xenova/transformers: ES-module bootstrap that exposes a lazy category-classifier as window._categoryPipelinePromise -->
@@ -1462,6 +1462,6 @@
     </div>
 </div>
 
-<script src="assets/js/app.js?v=20260507o"></script>
+<script src="assets/js/app.js?v=20260508a"></script>
 </body>
 </html>