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.
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EAN / UPC Generator
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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.
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Generate consistent SKU codes in bulk from a custom pattern with variant permutations, sequential numbering and collision checking.
Product CSV Validator
Check a product CSV for missing columns, broken variant handles, duplicate SKUs, invalid barcodes and bad prices before you import it.
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Check product images against each marketplace's dimension, aspect ratio, file size and format rules before you upload them.
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Validate ISBN-10 and ISBN-13 check digits, convert between them, and check Amazon ASIN format in bulk.
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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.
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.
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.
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.
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.
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