diff --git a/resources/views/pages/pdfs/invoice.blade.php b/resources/views/pages/pdfs/invoice.blade.php
index f75cbeed..2356033a 100644
--- a/resources/views/pages/pdfs/invoice.blade.php
+++ b/resources/views/pages/pdfs/invoice.blade.php
@@ -136,21 +136,25 @@
 @endsection
 
 @php
+    if (!extension_loaded('bcmath')) {
+        throw new Exception('BCMath extension is not loaded.');
+    }
     function calculateSubtotal($po_order_transaction, $currencyRate) {
-        $subtotal = 0;
+        $subtotal = "0";
         foreach ($po_order_transaction->transactionDetails as $transaction_detail) {
-            $unitPrice = $transaction_detail->price / $currencyRate;
-            $itemTotal = $unitPrice * $transaction_detail->quantity;
-            $subtotal += $itemTotal;
+            $unitPrice = bcdiv((string)$transaction_detail->price, (string)$currencyRate, 2);
+            $itemTotal = bcmul($unitPrice, (string)$transaction_detail->quantity, 2);
+            $subtotal = bcadd($subtotal, $itemTotal, 2);
         }
         return $subtotal;
     }
 
     function getVoucherDiscount($voucher_redemption) {
-        return $voucher_redemption ? $voucher_redemption->value * -1 : 0;
+        return $voucher_redemption ? bcmul((string)$voucher_redemption->value, "-1", 2) : "0";
     }
 
     function calculateTotalInvoice($subtotal, $service_charge, $tax, $voucherDiscount) {
-        return $subtotal + $service_charge + $tax + $voucherDiscount;
+        return bcadd(bcadd(bcadd($subtotal, $service_charge, 2), $tax, 2), $voucherDiscount, 2);
     }
+
 @endphp