Discount Calculator
Find a sale price, discount percentage or the effect of two consecutive discounts.
How to calculate a discount
Sale price = original price × (1 − discount / 100). For two discounts, apply each to the remaining price: original × (1 − first / 100) × (1 − second / 100).
Example: 20% then 10% off 1,000 gives 720, saving 280 or 28%. Discounts must be between 0% and 100%. To find a percentage, the original price must be positive and the sale price cannot exceed it.
Frequently asked questions
Is 20% plus 10% the same as 30% off?
No. Successive discounts multiply the remaining price, producing 28% off in this example.
What this calculator estimates
A percentage discount is calculated from the original price, not from the final sale price. Consecutive discounts must be applied one after another.
Formula and method
Savings = original price × discount rate. Sale price = original price − savings.
Worked examples
- A 20% discount on ₹2,500 saves ₹500, so the sale price is ₹2,000.
- Two consecutive discounts of 20% and 10% on ₹1,000 produce ₹720, not ₹700.
Methodology and assumptions
Each percentage is treated as a fraction of its current base. A single discount is subtracted from the original price; consecutive discounts are applied sequentially to the remaining price rather than added together.
Authoritative sources
- Guide to the SI: percent represents the number 0.01National Institute of Standards and Technology
Sources last checked September 10, 2026. Regulations and guidance can change; use the linked authority for the current position.
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Calculation, source, and limitation check completed September 10, 2026 by Ajit Naskar. No independent professional review is claimed.