Discount Calculator

A discount calculator turns a sale tag into the amount you actually pay. Enter the MRP, the headline discount and any 'extra % off', and it shows the final price, the rupees you save, the effective discount on MRP, and the GST that is either added on top or already sitting inside the price.

The point of the calculator is the stacking. Retailers advertise '25% off + extra 10% off' because the extra discount is taken on the already-reduced price, not on MRP — so the combined saving is 32.5%, never 35%. Seeing the effective percentage lets you compare two offers honestly before you reach the billing counter.

How stacked discounts and GST are calculated

First discount: price = MRP × (1 − discount ÷ 100). Extra offer: that price × (1 − extra ÷ 100). Effective discount = (MRP − final price) ÷ MRP × 100. On a ₹2,000 MRP with 25% off, you pay ₹1,500 and save ₹500. Add 'extra 10% off' and the 10% comes off ₹1,500, not ₹2,000: ₹1,500 × 0.90 = ₹1,350. You save ₹650 in total, an effective 32.5% off — 2.5 percentage points less than simply adding 25 and 10.

GST depends on how the price is quoted. Retail MRP in India is legally inclusive of all taxes, so at 18% the ₹1,350 you pay already contains ₹205.93 of GST: 1,350 − 1,350 ÷ 1.18. Where GST is charged on top — most services, B2B quotes and many online listings shown 'exclusive of taxes' — it is added to the discounted price instead, so ₹1,000 with no discount at 18% bills ₹1,180. Switch the toggle to match the way your bill is written.

How to use this calculator

• Set the MRP or listed price from the tag.
• Enter the headline discount percentage advertised on the offer.
• Add the 'extra % off' only if the store applies it on the already-discounted price — leave it at 0 otherwise.
• Set the GST rate for the product category, then choose whether GST is already in the MRP or charged on top.
• Compare the effective discount against a rival offer, and open the price breakdown to see each step of the bill.

Reading Indian sale tags and MRP rules

Under the Legal Metrology (Packaged Commodities) Rules, MRP is the maximum price at which a packaged item may be sold and it must be inclusive of all taxes — so a shop cannot add GST on top of MRP, and 'MRP + taxes' on a bill is a violation you can refuse to pay. Dual MRPs for the same pack are also not allowed, other than the separately permitted pricing at airports and in hotels for institutional supply. Always check that the discount is computed on the printed MRP and not on an inflated 'list price'.

During end-of-season sales, look past the biggest number on the poster. '50% + extra 20%' is an effective 60% off, not 70%. Bank-card offers usually apply after the discounts as a flat cashback capped at a rupee amount, so a '10% instant discount up to ₹1,000' on a ₹1,350 bill is worth ₹135, not ₹1,000. Coupons on marketplaces stack in a fixed order — item discount, then coupon, then bank offer — and GST is charged on the discounted taxable value, which is why the invoice tax line falls along with the price.

Frequently asked questions