How to use the Discount Calculator
- Enter the original price.
- Enter the discount percentage.
- Add an extra discount if the store offers one on top, such as a coupon code.
- Add sales tax if it is charged after the discount (common in the US).
Formula used
Sale price = Price × (1 − d₁/100) × (1 − d₂/100)You save = Price − Sale priceTotal discount % = (1 − (1 − d₁/100)(1 − d₂/100)) × 100
Worked examples
| Price | Discount | Sale price | You save |
|---|---|---|---|
| $50 | 20% | $40 | $10 |
| $80 | 25% | $60 | $20 |
| £120 | 40% + 20% | £57.60 | £62.40 (52%) |
| ₹2,999 | 30% | ₹2,099.30 | ₹899.70 |
Frequently asked questions
How do I calculate 20% off?
Multiply the price by 0.8. For example, 20% off $35 is 35 × 0.8 = $28.
Is 40% + 20% off the same as 60% off?
No. The second discount applies to the already reduced price, so the total is 52%.
How do I find the discount percentage from two prices?
Discount % = (Original − Sale) ÷ Original × 100. The Percentage Calculator can do this too.
Is sales tax charged before or after the discount?
In most US states, sales tax is charged on the discounted price. In the UK and India, prices usually include VAT or GST already.
How do I work out the original price from the sale price?
Divide the sale price by (1 − discount/100). If $60 is the price after 25% off, the original was $80.
Written and tested by MasterKit Online Editorial Team
Our team builds and tests every tool by hand, checks each formula against official sources (IRS, HMRC, the Income Tax Department of India, CBSE, NHS, WHO) and reviews pages whenever rules change. Last reviewed on . Spotted a mistake? Tell us.