Discount Calculator
Work out the sale price after a discount and how much you save. Use a percentage or a fixed amount off, stack a second discount (like an extra 10% at checkout), and add tax to see the final price you’ll pay.
Calculate the discount
Discount formulas
Percentage off
Sale price = price × (1 − discount% ÷ 100) · Saving = price − sale priceAmount off
Sale price = price − amount · Discount % = amount ÷ price × 100With tax
Final price = sale price × quantity × (1 + tax% ÷ 100)In most places tax is charged on the discounted price, not the original price.
Stacked discounts are not added together
“25% off plus an extra 10%” is not 35% off. The second discount applies to the already-reduced price: 1 − (0.75 × 0.90) = 32.5% in total. The calculator shows the true combined discount.
Worked examples
- Sale price = 80 × 0.75 = 60; you save 20
- After 25%: 60; after extra 10%: 54 (32.5% total off)
- With 20% VAT: 54 × 1.2 = 64.80
Quick discount table
| Price | 10% off | 20% off | 25% off | 30% off | 50% off |
|---|---|---|---|---|---|
| 20 | 18.00 | 16.00 | 15.00 | 14.00 | 10.00 |
| 50 | 45.00 | 40.00 | 37.50 | 35.00 | 25.00 |
| 100 | 90.00 | 80.00 | 75.00 | 70.00 | 50.00 |
| 250 | 225.00 | 200.00 | 187.50 | 175.00 | 125.00 |
| 1,000 | 900.00 | 800.00 | 750.00 | 700.00 | 500.00 |
Frequently asked questions
How do I calculate 20% off a price?
Multiply the price by 0.8. 20% off 45 is 45 × 0.8 = 36, a saving of 9.
How do I work out the discount percentage?
Divide the amount saved by the original price and multiply by 100. A 120 item reduced to 90 is 30 ÷ 120 = 25% off.
Is 20% + 10% off the same as 30% off?
No, it is 28% off in total: 0.8 × 0.9 = 0.72 of the original price.
Related calculators
Check the store’s terms: some discounts can’t be combined, and tax rules vary by country.