Discount Calculator
Calculate sale price, savings, or find what percentage off something is.
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How to Calculate a Discount
To find the sale price after a percentage discount, multiply the original price by (1 − discount% ÷ 100). For a 20% discount on a $100 item: $100 × 0.80 = $80. The savings are simply: Original Price × (discount% ÷ 100) = $100 × 0.20 = $20.
Common Discount Reference Table
| Discount | $50 Item | $100 Item | $200 Item | $500 Item |
|---|---|---|---|---|
| 5% off | $47.50 | $95.00 | $190.00 | $475.00 |
| 10% off | $45.00 | $90.00 | $180.00 | $450.00 |
| 15% off | $42.50 | $85.00 | $170.00 | $425.00 |
| 20% off | $40.00 | $80.00 | $160.00 | $400.00 |
| 25% off | $37.50 | $75.00 | $150.00 | $375.00 |
| 30% off | $35.00 | $70.00 | $140.00 | $350.00 |
| 40% off | $30.00 | $60.00 | $120.00 | $300.00 |
| 50% off | $25.00 | $50.00 | $100.00 | $250.00 |
| 60% off | $20.00 | $40.00 | $80.00 | $200.00 |
| 75% off | $12.50 | $25.00 | $50.00 | $125.00 |
How to Find What Percentage Off
If you know the original price and the sale price, the discount percentage is: ((Original − Sale) ÷ Original) × 100. Example: a jacket was $120 and is now $84. Discount = ((120 − 84) ÷ 120) × 100 = 30% off.
Finding the Original Price
When you only know the sale price and the discount, recover the original with: Sale Price ÷ (1 − discount% ÷ 100). Example: a $72 shirt after 40% off originally cost $72 ÷ 0.60 = $120.
Frequently Asked Questions
20% of $50 is $10, so the sale price is $50 − $10 = $40. Use the calculator above to check any combination instantly.
Multiply the remaining percentages: (1 − 0.20) × (1 − 0.10) = 0.72, so you pay 72% of the original — a combined discount of 28%, not 30%. Two discounts are never simply additive.
50% off means you pay exactly half the original price and save the other half. So a $200 item at 50% off costs $100, saving you $100.
Use the "Find Original Price" tab above. Enter the sale price and the discount percentage and the calculator recovers the original price for you.
Close but not the same. Buy 3 get 1 free means you pay for 3 out of 4 items, which is 25% off — not 30%. A 30% discount reduces every item by 30%.
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