Free discount calculator
Calculate sale price and savings for any discount percentage — enter original price and discount rate to see the final price and money saved, updated live, as you type.
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Final price = original × (1 − discount%). Does not include sales tax.
Results are estimates. Consult a professional.
How the discount calculator works
A discount calculator finds the sale price after a percentage reduction, the dollar amount saved, and the effective final price when multiple discounts are applied. Stacking two discounts is not the same as adding them — each successive discount is taken on the already-reduced price, so two 15% discounts yield 27.75% off, not 30%.
Worked example: single vs. stacked discounts
Single discount: A $80 jacket is marked 25% off. Stacked discounts: A $100 item gets a 10% loyalty discount applied first, then a 15% seasonal promotion applied to the reduced price. The result is not 25% off.
Sale prices at common discount levels
The table shows the final sale price for four original price points across five discount rates. All figures assume a single discount applied to the original price.
| Original Price | 10% Off | 20% Off | 25% Off | 30% Off | 50% Off |
|---|---|---|---|---|---|
| $25 | $22.50 | $20.00 | $18.75 | $17.50 | $12.50 |
| $50 | $45.00 | $40.00 | $37.50 | $35.00 | $25.00 |
| $100 | $90.00 | $80.00 | $75.00 | $70.00 | $50.00 |
| $200 | $180.00 | $160.00 | $150.00 | $140.00 | $100.00 |
Source: Sale price = original × (1 − discount%). Values exclude tax.
Tips for evaluating discounts
Discounts are marketing tools as well as genuine savings. Knowing how the math works helps you cut through anchoring tactics and identify when a deal is actually a deal.
- Calculate savings in dollars, not just percent — a 50% discount on a $20 item saves $10; a 10% discount on a $200 item saves $20. Raw percentages can mislead.
- Check the original price history — retailers sometimes inflate the 'original' price before marking it down; browser extensions like CamelCamelCamel track Amazon price history.
- Understand stacked discount order — when a store coupon and a site-wide sale combine, the order usually doesn't matter (multiplication is commutative), but a flat dollar coupon applied first changes the math.
- Factor in tax after discount — sales tax is almost always applied to the post-discount price, so the effective tax amount is lower on a discounted purchase.
- Compare unit prices on bulk discounts — a 'buy 2 get 1 free' offer is a 33.3% discount per unit; compare that against a percentage-off deal on a single unit.
Accuracy and limitations
The calculator assumes the stated original price is the genuine pre-discount price. In practice, 'original' prices can be manipulated to exaggerate savings — a known retail practice that has attracted FTC scrutiny. Results do not include sales tax, which varies by jurisdiction, or fees that may apply. For stacked discounts, the calculation assumes each discount is applied sequentially to the running price; some retailers apply all discounts to the original price simultaneously, which produces a different (and more favorable) result.
Not financial advice — consult a financial professional for your specific situation.
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About this calculator
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