🏷️ Discount Calculator
Find the final price and your savings for any percentage discount, including an extra discount stacked on top.
Quick answer: Sale price = original × (1 − discount ÷ 100). For example, 25% off $80 saves $20.00, so you pay $60.00; an extra 10% off brings it to $54.00 – a 32.5% total discount, not 35%.
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Discount Calculator inputs
Result
Final price
$60.00
You save $20.00
| Original price | $80.00 |
| 25% off | −$20.00 |
| You pay | $60.00 |
Common discounts on $80.00
| Discount | You save | You pay |
|---|---|---|
| 5% off | $4.00 | $76.00 |
| 10% off | $8.00 | $72.00 |
| 15% off | $12.00 | $68.00 |
| 20% off | $16.00 | $64.00 |
| 25% off | $20.00 | $60.00 |
| 30% off | $24.00 | $56.00 |
| 40% off | $32.00 | $48.00 |
| 50% off | $40.00 | $40.00 |
| 60% off | $48.00 | $32.00 |
| 70% off | $56.00 | $24.00 |
How to calculate a discount
A percentage discount reduces the price by that share of the original. Convert the percentage to a decimal, multiply by the price to get your saving, and subtract.
Saving = Price × Discount ÷ 100 · Sale price = Price × (1 − Discount ÷ 100)
Example: a pair of $80 trainers at 25% off → saving $20.00, sale price $60.00.
Stacked (double) discounts
“Take an extra 10% off sale prices” means the second discount is applied to the reduced price, not the original. Multiply the remaining fractions together:
Final = Price × (1 − d₁) × (1 − d₂) · Combined discount = 1 − (1 − d₁)(1 − d₂)
Example: $80 × 0.75 × 0.90 = $54.00. The combined discount is 32.5%, a little less than the 35% you might expect from adding them. The order of the two discounts makes no difference to the final price.
Quick mental shortcuts
- 10% off: move the decimal point one place left and subtract.
- 25% off: divide by 4 and subtract, or multiply by 0.75.
- 50% off: halve the price.
- “Buy one, get one half price”: equals 25% off each item when buying two.
Shopping tips
- Compare the final price, not the size of the percentage – a higher list price can hide a weaker deal.
- Check whether a coupon applies before or after other promotions; the result is the same mathematically, but eligibility rules differ.
- Remember that sales tax or VAT and shipping may be added after the discount.
Estimates for educational purposes, not financial or tax advice.
Frequently asked questions
How do I calculate a percentage discount?
Multiply the original price by the discount percentage and divide by 100 to get the saving, then subtract it from the price. 30% off $50 is a $15 saving, so you pay $35.
Do stacked discounts add up?
No. A second discount applies to the already-reduced price, so 20% off then an extra 20% off is a 36% total discount, not 40%. The calculator shows the true combined figure.
How do I find the original price from a sale price?
Divide the sale price by 1 minus the discount as a decimal. A $45 item marked 25% off originally cost 45 ÷ 0.75 = $60.
Is sales tax charged before or after the discount?
In most places tax is charged on the discounted price for store discounts and coupons. Manufacturer coupons are sometimes taxed on the full price.