Discount calculator
Enter a price and a discount — as a percentage or a flat amount — and see what you pay and what you save. Stack a second discount, set a quantity, and the numbers follow as you type.
- Original price
- $100.00
- Discount
- − $20.00
Now find a discount worth calculating
Couponly's free browser extension tries working codes at checkout for you and tells you the moment it finds one that sticks.
How to use the discount calculator
- 1
Enter the original price. The price on the tag, before anything comes off. Change the currency if you need to — it only affects how the result is written.
- 2
Enter the discount. Use the toggle to switch between a percentage (30% off) and a flat amount ($30 off), or tap one of the quick percentages.
- 3
Read what you pay. The result updates as you type, with the amount saved and the effective percentage off. Add an extra discount or a quantity for the full picture.
What common discounts come to
Every figure below is produced by the calculator above, so it matches to the cent.
| Discount | $25.00 | $50.00 | $100.00 | $250.00 |
|---|---|---|---|---|
| 10% off | $22.50save $2.50 | $45.00save $5.00 | $90.00save $10.00 | $225.00save $25.00 |
| 15% off | $21.25save $3.75 | $42.50save $7.50 | $85.00save $15.00 | $212.50save $37.50 |
| 20% off | $20.00save $5.00 | $40.00save $10.00 | $80.00save $20.00 | $200.00save $50.00 |
| 25% off | $18.75save $6.25 | $37.50save $12.50 | $75.00save $25.00 | $187.50save $62.50 |
| 30% off | $17.50save $7.50 | $35.00save $15.00 | $70.00save $30.00 | $175.00save $75.00 |
| 40% off | $15.00save $10.00 | $30.00save $20.00 | $60.00save $40.00 | $150.00save $100.00 |
| 50% off | $12.50save $12.50 | $25.00save $25.00 | $50.00save $50.00 | $125.00save $125.00 |
| 60% off | $10.00save $15.00 | $20.00save $30.00 | $40.00save $60.00 | $100.00save $150.00 |
| 70% off | $7.50save $17.50 | $15.00save $35.00 | $30.00save $70.00 | $75.00save $175.00 |
| 75% off | $6.25save $18.75 | $12.50save $37.50 | $25.00save $75.00 | $62.50save $187.50 |
Percentage off, amount off, and why stacking isn't addition
A percentage discount scales with the price: 20% off is worth $4 on a $20 shirt and $400 on a $2,000 laptop. A flat amount doesn't — $10 off is $10 whatever you buy, which makes it a bigger effective discount the cheaper the item is. When a store offers you the choice, work out both: $10 off beats 20% off on anything under $50.
Stacked discounts are where the mental arithmetic usually goes wrong. "20% off, plus an extra 10% off sale prices" is not 30% off. The second discount comes off the already-reduced price, so $100.00 becomes $80.00, and 10% off that is $72.00 — 28% off in total. The gap widens as the discounts get bigger: 30% and an extra 30% is 51% off, not 60%.
A coupon code behaves the same way. It normally applies to the subtotal after any sale price, and tax and shipping are calculated afterwards — which is why the number here is your subtotal, not your final total at checkout.