Discount Calculator
Sale price, savings and stacked discounts
- You pay₹3,49970%
- You save₹1,50030%
| You pay | ₹3,499 | 70.0% |
| You save | ₹1,500 | 30.0% |
Understand the result
About the Discount Calculator
How are discounts calculated?
A discount reduces the price by a percentage or a fixed amount. Sale price = original price × (1 − discount ÷ 100). Things get trickier with stacked offers — “extra 10% off”, bank card discounts, coupons — because each discount applies to the already-reduced price, and GST is then charged on the discounted amount.
This discount calculator works out the sale price and your saving for a percentage or flat discount, applies an optional extra discount on top, adds GST on the final price, and shows the effective overall discount.
How this calculator works
Enter the original price and the discount — as a percentage or a flat rupee amount — and the calculator shows the price you pay and how much you save.
Many sales stack a second discount on top: “flat 30% off + extra 10%”. The second discount applies to the already-reduced price, so the two multiply rather than add. 30% plus 10% is 37% off, not 40%.
If tax is charged on top of the discounted price (common on B2B invoices and some services), add the rate and it is applied after every discount.
Formula
Price after discount = Price × (1 − d₁) × (1 − d₂) Effective discount = 1 − (1 − d₁) × (1 − d₂) Final price = Price after discount × (1 + tax)
Worked example
- A ₹4,999 jacket at 30% off, with an extra 10% card offer.
- After 30%: ₹3,499.30. After the extra 10%: ₹3,149.37.
- You save ₹1,849.63 — an effective 37% off, not 40%.
Stacked discounts are less than they sound
| Offer | Effective discount |
|---|---|
| 20% + extra 10% | 28% |
| 30% + extra 10% | 37% |
| 50% + extra 20% | 60% |
| 40% + extra 40% | 64% |
Multiply the remaining shares: 30% + 10% leaves 0.70 × 0.90 = 0.63 of the price, a 37% discount. Always compare the final price rather than the headline percentages.
Assumptions & important notes
Important notes
- MRPs in India already include GST, so leave the tax at 0 for retail purchases.
- “Up to 70% off” usually means only a few items get the full discount. Check the price of the item you actually want.
- Bank-card offers are often capped at a maximum rupee amount — on a big purchase the effective discount can be much smaller than the headline percentage.
Frequently asked questions
How do I calculate a discount percentage?
Divide the amount saved by the original price and multiply by 100. A ₹4,999 item sold for ₹3,999 is (1,000 ÷ 4,999) × 100 ≈ 20% off.
Is 50% + 20% off the same as 70% off?
No. 50% off leaves half the price; another 20% off that leaves 40% of the original. The total discount is 60%, not 70%.
How do I find the original price from the sale price?
Divide the sale price by (1 − discount). A ₹2,100 price after 30% off was originally 2,100 ÷ 0.7 = ₹3,000.
Is GST charged before or after the discount?
On the price after any discount shown on the invoice. A ₹10,000 item with 10% off is taxed on ₹9,000.
PaiseWise runs entirely in your browser — the figures you enter are never sent anywhere. Results are estimates for planning only, not financial, tax or investment advice.