How Discounts Are Calculated
A discount reduces a price by a percentage of its original value. This calculator shows the exact amount saved along with the final price you'll pay after the discount is applied.
How Discount & Sale Price Are Calculated
Final Price = Original Price × (1 − Discount% / 100)
For example, imagine a jacket priced at ₹4,000 with a 25% discount. Multiply 4,000 by (1 − 25/100), which is 4,000 × 0.75, giving a final price of ₹3,000. You've saved ₹1,000 — the difference between the original and final price.
Stacking Discounts
Watch out for "discount on discount" offers (e.g. 20% + 10% extra) — these don't simply add up to 30%. Each discount applies to the already-reduced price, so the effective total discount is always slightly less than the sum. Let's say a product is priced at ₹2,000. A 20% discount brings it to ₹1,600. Applying a further 10% off that ₹1,600 (not the original ₹2,000) brings it to ₹1,440 — a total saving of ₹560, or 28% off the original price, not the 30% a quick mental sum might suggest.
A typical mistake we often see is shoppers adding stacked discount percentages together and expecting a bigger saving than they actually get. Retailers sometimes rely on this exact mental shortcut when advertising layered discounts, since "20% + 10% off" sounds more generous than the true combined 28% it actually works out to.
Working Backward: Finding the Original Price From a Sale Price
One common scenario: you see a sale price and the discount percentage, but want to know the original price. Rearranging the formula gives Original Price = Final Price ÷ (1 − Discount% / 100). Imagine you see a pair of shoes on sale for ₹2,250 after a 25% discount. Dividing 2,250 by 0.75 gives ₹3,000 as the original price — useful for spotting whether a "sale" price is genuinely discounted from a realistic original price, or whether the original price looks artificially inflated to make the discount seem bigger than it really is.
Does the Discount Apply Before or After Tax?
This is worth checking carefully, since it changes the final amount you pay. Discounts are usually applied to the pre-tax price, with tax (like GST) calculated afterward on the discounted amount — but this isn't universal, and retailer practices can vary. A small business owner setting up a store discount, or a shopper trying to verify a receipt, should check exactly how a specific retailer sequences the discount and tax calculation, since applying tax before versus after a discount produces different final totals.
Comparing Deals Across Different Discount Structures
Retailers often present discounts in different formats — a flat percentage off, a flat rupee amount off, or a "buy one get one at X% off" structure — which makes direct comparison tricky at a glance. Converting every offer into an effective percentage discount on the total spend is usually the clearest way to compare them fairly. Imagine you're choosing between a store offering a flat ₹500 off a ₹2,500 purchase and another offering 15% off the same purchase. The flat ₹500 works out to a 20% effective discount, meaningfully better than the 15% offer, even though "15%" might sound like the bigger number at first glance.