How to use the Discount Calculator
- Enter the original price before any discount.
- Enter the discount percentage shown on the offer.
- If there is a second offer such as a coupon, enter it in the extra discount box. Leave it at 0 otherwise.
- Read the final price, the amount saved and the effective discount.
Formula used
Final price = Price × (1 − D1 ÷ 100) × (1 − D2 ÷ 100). You save = Price − Final price. Two discounts do not simply add up, because the second applies to the already-reduced price.
Worked example
Here is the Discount Calculator worked through with the example values shown above, so you can check each step by hand.
| Inputs | |
|---|---|
| Original price | ₹2,000 |
| Discount | 25 % |
| Extra discount (optional) | 0 % |
| Result | |
| Final price | ₹1,500 |
| You save | ₹500 |
| Effective discount | 25% |
How a discount is calculated
The saving is the price multiplied by the discount percentage divided by 100, and the final price is the price minus that saving. At 25% off ₹2,000, you save ₹500 and pay ₹1,500. At 30% off ₹1,499, you save ₹449.70 and pay ₹1,049.30.
To go backwards and find the original price from a sale price, divide the final price by (1 − discount ÷ 100). ₹1,500 after a 25% discount means an original price of 1,500 ÷ 0.75 = ₹2,000.
Why two discounts do not add up
A second discount is applied to the already reduced price, not the original one. 20% off followed by another 10% off is not 30% off. On ₹2,000 you pay ₹1,600 after the first discount and then ₹1,440 after the second, so the total saving is ₹560, which is an effective discount of 28%.
This matters when stores advertise stacked offers. The combined effect is always a little smaller than the sum of the percentages.
Tips for comparing offers
Compare final prices, not percentages. A smaller discount on a lower starting price can beat a bigger discount on an inflated one. Check whether the displayed price already includes GST and whether delivery charges apply, because both change what you actually pay. A flat ₹ discount is better than a percentage on a cheap item, and the reverse is true on an expensive one.
Successive discounts and working backwards
Two discounts do not simply add. A 20% discount followed by an extra 10% is not 30% off: the price becomes 80% × 90% = 72% of the original, a total discount of 28%. The calculator shows this as the effective discount.
To find the original price from a sale price, divide the sale price by one minus the discount: a jacket on sale for 80 at 20% off was 80 ÷ 0.80 = 100. Be careful with “up to” discounts, which apply only to some items, and with coupons that apply before or after other discounts, since the order can change the final price.
Frequently asked questions
How do I calculate the discounted price?
Multiply the price by (1 − discount ÷ 100). For 25% off ₹2,000, 2,000 × 0.75 = ₹1,500.
How do I calculate the discount percentage from two prices?
Subtract the sale price from the original price, divide by the original price and multiply by 100. If ₹2,000 becomes ₹1,500, (500 ÷ 2,000) × 100 = 25%.
Is a 20% + 10% discount the same as 30%?
No. The second discount applies to the reduced price, so 20% followed by 10% is an effective 28% discount.
How do I find the original price from the sale price?
Divide the sale price by (1 − discount ÷ 100). A ₹1,500 sale price at 25% off means the original price was ₹2,000.
Does the discount apply before or after GST?
It depends on the seller. Some prices are shown with GST included. Check the final bill to see how the discount and tax were applied.
What is an effective discount?
It is the total saving as a percentage of the original price after all discounts are applied. With 20% and then 10% off, the effective discount is 28%.
Is 20% off and then 10% off the same as 30% off?
No. It is 28% off, because the second discount applies to the already reduced price.
This calculator gives estimates for information only. Actual figures from a bank, employer, tax authority or doctor may differ. It is not financial, tax, legal or medical advice.