Calculate sale prices, savings, and original prices instantly. Handles percent off, stacked discounts, reverse calculations and BOGO deals — free and accurate.
⚠️ Important: 20% off + 10% off does NOT equal 30% off. Each discount applies to the already-reduced price. Use this calculator to find the true total discount.
Here are the most commonly searched discount amounts. Enter your exact price in the calculator above for any amount not shown here.
| Original Price | 10% off | 20% off | 25% off | 30% off | 50% off |
|---|---|---|---|---|---|
| $10 | $9.00 | $8.00 | $7.50 | $7.00 | $5.00 |
| $20 | $18.00 | $16.00 | $15.00 | $14.00 | $10.00 |
| $25 | $22.50 | $20.00 | $18.75 | $17.50 | $12.50 |
| $50 | $45.00 | $40.00 | $37.50 | $35.00 | $25.00 |
| $75 | $67.50 | $60.00 | $56.25 | $52.50 | $37.50 |
| $100 | $90.00 | $80.00 | $75.00 | $70.00 | $50.00 |
| $150 | $135.00 | $120.00 | $112.50 | $105.00 | $75.00 |
| $200 | $180.00 | $160.00 | $150.00 | $140.00 | $100.00 |
| $250 | $225.00 | $200.00 | $187.50 | $175.00 | $125.00 |
| $300 | $270.00 | $240.00 | $225.00 | $210.00 | $150.00 |
| $500 | $450.00 | $400.00 | $375.00 | $350.00 | $250.00 |
| $1,000 | $900.00 | $800.00 | $750.00 | $700.00 | $500.00 |
Understanding how discounts work helps you make smarter purchasing decisions and spot when a "deal" isn't actually a deal. Here are all the formulas you need.
To find the sale price after a percentage discount, multiply the original price by the discount percentage to get the savings, then subtract from the original price.
Example: 20% off $50 → $50 × (1 − 0.20) = $50 × 0.80 = $40 sale price. You save $10.
If you know what you paid and what discount was applied, you can work backwards to find the original price. This is useful when comparing prices across stores.
Example: You paid $80 and it was 20% off → $80 ÷ 0.80 = $100 original price.
To calculate what percentage discount you received, subtract the sale price from the original, divide by the original price, and multiply by 100.
Example: Original $120, sale price $90 → ((120 − 90) ÷ 120) × 100 = 25% off.
One of the most common misconceptions in shopping is that two percentage discounts add together. They don't — and retailers know this.
🧮 Example: A $100 item with 20% off then 10% off → First: $100 × 0.80 = $80. Then: $80 × 0.90 = $72. Total saved: $28. Effective discount: 28% — NOT 30%.
Each successive discount is applied to the already-reduced price. The more discounts stack, the bigger the gap between what you might expect and what you actually save. Use our stacked discount calculator above to see the true effective discount.
BOGO (Buy One Get One) deals are popular but often misunderstood. Here's what each type actually means in real savings:
BOGO Free — You buy one at full price, get the second free. Effective discount: 50% per item (when buying exactly two identical items).
BOGO 50% off — You buy one at full price, get the second at half price. Effective discount: 25% on your total purchase.
Buy 2 Get 1 Free — You buy two at full price, get the third free. Effective discount: 33% per item when buying three.
The key question to ask: would you have bought the second item anyway? If not, BOGO is often designed to make you spend more, not save more.
When comparing a percentage discount to a fixed amount off, the answer depends on the original price. A percentage discount grows with the price, while a fixed discount stays the same.
Example: Is 20% off better than $15 off? On a $60 item — 20% off saves $12, so $15 off is better. On an $80 item — 20% off saves $16, so 20% off is better. The crossover point is $75 — at exactly $75, both save the same amount.