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Not every discount reduces to a single percentage. Two coupons applied one after another don't add up the way they look like they should, a Buy-2-Get-1-Free offer hides an effective rate that no one works out at a glance, and a bundle price only saves money if you check it against buying the items separately. This tool covers all three.

Why stacked discounts don't add up

A 20% discount followed by a 10% discount does not make a 30% discount. The second percentage applies to the already-reduced price, never the original. On a ₹1,999 item that works out to a 28% effective discount. The gap widens with larger or more numerous stacked discounts.

The real discount rate behind a BOGO-style offer

"Buy 2, get 1 free" pays for 2 items but hands over 3. That works out to a 33.3% effective discount on the total, not the 50% most people assume. This calculator converts any buy/free quantity combination into the effective discount rate and the effective per-item price.

Checking whether a bundle saves money

A bundle price only makes sense next to what the same items would cost bought individually. Retailers sometimes price bundles at little or no real saving. This comparison catches that before you commit to offering one or buying one.

Frequently asked questions

Is 20% off plus 10% off the same as 30% off?

No. Stacked percentage discounts compound instead of adding. Applying 20% and then 10% leaves a 28% effective discount off the original price, because the second 10% comes off the already-discounted amount.

What's the effective discount on a Buy 1 Get 1 Free offer?

50%. You pay for 1 item and receive 2, so you're paying half the full price for the same total quantity. The effective rate shifts with the buy/free ratio, and the second calculator works it out for any combination you enter.

Ecommerce & Catalog Cluster

Often used together when preparing marketplace listings - see the full workflow.

GTIN Converter

Convert product codes between GTIN-8, GTIN-12 (UPC-A), GTIN-13 (EAN-13) and GTIN-14, validate check digits, and normalise a whole catalog in bulk.

Ecommerce & CatalogOpen Tool

EAN / UPC Generator

Generate valid-checksum EAN-13, EAN-8, UPC-A and GTIN-14 product codes in bulk for test catalogs, and validate the check digit of any existing code.

Ecommerce & CatalogOpen Tool

Barcode Generator

Render a scannable EAN-13, UPC-A, CODE128 or ITF-14 barcode from a product code and download it as a PNG for labels and store listings.

Ecommerce & CatalogOpen Tool

SKU Generator

Generate consistent SKU codes in bulk from a custom pattern with variant permutations, sequential numbering and collision checking.

Ecommerce & CatalogOpen Tool

Product CSV Validator

Check a product CSV for missing columns, broken variant handles, duplicate SKUs, invalid barcodes and bad prices before you import it.

Ecommerce & CatalogOpen Tool

Marketplace Image Checker

Check product images against each marketplace's dimension, aspect ratio, file size and format rules before you upload them.

Ecommerce & CatalogOpen Tool

ISBN / ASIN Validator

Validate ISBN-10 and ISBN-13 check digits, convert between them, and check Amazon ASIN format in bulk.

Ecommerce & CatalogOpen Tool

IBAN Generator

Generate format-valid, checksum-correct IBAN numbers for any supported country for testing and QA, and validate the checksum of any IBAN.

Ecommerce & CatalogOpen Tool

GST Calculator

Add or remove GST at any standard slab rate, split into CGST/SGST for intra-state supply or IGST for inter-state supply.

Ecommerce & CatalogOpen Tool

Profit Margin Calculator

Work out margin and markup from cost and selling price, roll shipping and duty into a per-unit landed cost, or back into the price a target margin needs.

Ecommerce & CatalogOpen Tool

Shipping Cost Calculator

Work out volumetric vs actual chargeable weight and the total shipping cost from your own courier's rate card, including fuel surcharge and COD fees.

Ecommerce & CatalogOpen Tool

COD & RTO Cost Calculator

Work out your own RTO rate, what a single return-to-origin actually costs, and how COD's net revenue per order compares to a discounted prepaid option.

Ecommerce & CatalogOpen Tool

Marketplace Fee Calculator

Enter your marketplace's commission, payment gateway, and shipping fees to see the real net payout and margin behind a listing price.

Ecommerce & CatalogOpen Tool