Calculate sale prices and total savings instantly. Enter the original price and discount percentage to find your final price. Supports stacked (double) discounts.
Enter a price and discount, then click Calculate Discount to see your savings.
Calculating a discount is a straightforward percentage operation. The formula determines how much you save and what you actually pay after the discount is applied.
Discount Formula:
For example, a 25% discount on a $120 item: Savings = $120 × 0.25 = $30. Final price = $120 − $30 = $90.
An equivalent shortcut is to multiply the original price by (1 − discount rate). So $120 × 0.75 = $90 directly.
Stacked discounts (also called compound or successive discounts) apply multiple percentage reductions sequentially, not additively. This is a critical distinction that many shoppers miss.
Why 20% + 10% does NOT equal 30%: When you apply 20% off first, the second 10% discount applies to the already-reduced price, not the original. Here is the math:
The combined discount formula is: Effective Discount = 1 − ((1 − d1) × (1 − d2)), where d1 and d2 are the discount rates as decimals. For 20% + 10%: 1 − (0.80 × 0.90) = 1 − 0.72 = 0.28 = 28%.
| Discount | $25 | $50 | $100 | $200 | $500 |
|---|---|---|---|---|---|
| 10% off | $22.50 | $45.00 | $90.00 | $180.00 | $450.00 |
| 15% off | $21.25 | $42.50 | $85.00 | $170.00 | $425.00 |
| 20% off | $20.00 | $40.00 | $80.00 | $160.00 | $400.00 |
| 25% off | $18.75 | $37.50 | $75.00 | $150.00 | $375.00 |
| 30% off | $17.50 | $35.00 | $70.00 | $140.00 | $350.00 |
| 40% off | $15.00 | $30.00 | $60.00 | $120.00 | $300.00 |
| 50% off | $12.50 | $25.00 | $50.00 | $100.00 | $250.00 |
Shopping tip: When comparing deals, always calculate the final price rather than comparing discount percentages. A 30% discount on a $200 item ($140 final) is a better deal than 40% off a $250 item ($150 final), even though the second discount percentage is higher. Focus on the amount you actually pay.