Discount Calculator

Stacked discounts and checking a deal

Two discounts applied one after another do not add up. A 20% discount followed by an extra 10% off the reduced price leaves you paying 0.8 × 0.9 = 0.72 of the original, which is a 28% total discount, not 30%. On a ₹2,000 item that is ₹1,440 rather than ₹1,400.

To compare offers, convert each to the final price you will actually pay, including shipping and taxes. A ₹500 flat discount beats a 20% discount only when the original price is below ₹2,500. Also check whether the 'original' price is genuine; a large percentage off an inflated list price may still cost more than a competitor's regular price.

How discounts are calculated

The sale price is the original price multiplied by (1 − discount ÷ 100). The amount saved is original × discount ÷ 100. For a 30 percent discount, you pay 70 percent of the original price.

When a shop offers two discounts one after another ("extra 10 percent off sale prices"), they multiply rather than add: 30 percent then 10 percent gives 0.70 × 0.90 = 0.63, which is a 37 percent total discount, not 40 percent.

Worked example

A jacket marked 3,499 with 25 percent off: savings are 3,499 × 0.25 = 874.75, so you pay 2,624.25. If GST is charged after the discount at 12 percent, the final bill is 2,624.25 × 1.12 = 2,939.16.

Spotting real bargains

A big percentage off an inflated "original" price is not a real saving. Compare the final price with what other sellers charge, and for bulk packs compare unit prices (price per gram or per piece) using the unit price comparison calculator.