How it is calculated
- Price after discount = original price × (1 − X%).
- With an additional discount: final price = original price × (1 − X%) × (1 − Y%).
- GST (optional) = final price × 18%, charged after the discount.
Example: flat 50% + extra 20% off
| Original price | Rs 5,000 |
| After 50% off | Rs 2,500 |
| After a further 20% off | Rs 2,000 |
| Total saved | Rs 3,000 (60% off, not 70%) |
| With 18% GST (if the shop adds it) | Rs 2,360 |
For any other percentage, use the percentage calculator.
Frequently asked questions
How do I calculate the price after a discount?
Multiply the price by the discount percentage and divide by 100 to get the amount off, then subtract it. A Rs 5,000 item at 30% off: 5,000 × 30 ÷ 100 = Rs 1,500 off, so you pay Rs 3,500.
Is “50% + 20% off” the same as 70% off?
No. The extra 20% is taken off the price that is already reduced. Rs 5,000 less 50% is Rs 2,500; less a further 20% is Rs 2,000. You save Rs 3,000, which is 60% off, not 70%.
Should GST be added after the discount?
Most shops show prices with sales tax already included, so you pay the tag price. Some outlets add GST at the till; where they do, it is charged on the price after discount. The standard sales tax rate is 18% (Sales Tax Act 1990, section 3). Tick the box only if your shop adds it on top.
How do I find the discount percentage from the old and new price?
Subtract the sale price from the original price, divide by the original price and multiply by 100. Rs 4,000 down to Rs 3,000 is 1,000 ÷ 4,000 × 100 = 25% off. The percentage calculator’s “% change” option does this.
Does the calculator round prices?
Amounts are shown to the nearest rupee. Shops may round differently, so the till price can differ by a rupee or two.
Guides
Related calculators
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- Salary tax calculatorCalculate your monthly income tax and take-home salary under the 2026-27 budget, and see how much you save compared with 2025-26.
Sources
- Sales Tax Act 1990 (FBR), section 3(1): standard rate of sales tax 18%
- Discounts: standard percentage arithmetic; successive discounts multiply, (1 − X%) × (1 − Y%).
This calculator gives an estimate for guidance. It is not official advice. Rates and rules change, so confirm important decisions with the relevant authority or a qualified professional. See how we calculate, or report a mistake.