Math
Discount Calculator
Calculate the final price after a percentage discount, find what percentage off you received, or work backwards to find the original price. Includes a quick comparison table for common discounts.
Quick select discount
Discount Comparison Table
| Discount | You Save | Final Price |
|---|---|---|
| 5% off | — | Enter price above |
| 10% off | — | Enter price above |
| 15% off | — | Enter price above |
| 20% off | — | Enter price above |
| 25% off | — | Enter price above |
| 30% off | — | Enter price above |
| 40% off | — | Enter price above |
| 50% off | — | Enter price above |
| 60% off | — | Enter price above |
| 70% off | — | Enter price above |
| 75% off | — | Enter price above |
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Frequently Asked Questions
How do I calculate a percentage discount?
To calculate a discount: multiply the original price by the discount percentage, then divide by 100 to find the amount saved. Subtract that from the original price to get the final price. Formula: Final Price = Original Price × (1 − Discount% ÷ 100). Example: 30% off $80 = $80 × 0.70 = $56. You save $24.
How much is 20% off?
To find 20% off any price, multiply the price by 0.80 (which is 1 − 0.20). For example: 20% off $50 = $50 × 0.80 = $40. You save $10. Quick mental math trick: 20% off = take 10% (move the decimal left one place) and double it. 10% of $50 = $5, doubled = $10 saved.
How much is 30% off?
Multiply the original price by 0.70. Example: 30% off $120 = $120 × 0.70 = $84. You save $36. Mental math: 10% of $120 = $12. Three times that = $36 saved.
How much is 50% off?
Simply halve the original price. 50% off $200 = $100. This is the easiest discount to calculate mentally — just divide by 2.
How do I calculate what percentage off something is?
Formula: Discount % = ((Original Price − Sale Price) ÷ Original Price) × 100. Example: An item originally $80 is now $60. Discount % = ((80 − 60) ÷ 80) × 100 = (20 ÷ 80) × 100 = 25% off. Use the 'What % off did I get?' mode above to calculate this automatically.
How do I find the original price before a discount?
Formula: Original Price = Sale Price ÷ (1 − Discount% ÷ 100). Example: An item is $75 after a 25% discount. Original price = $75 ÷ (1 − 0.25) = $75 ÷ 0.75 = $100. Use the 'Find original price' mode above.
Is a higher discount always a better deal?
Not necessarily. A 50% discount on an overpriced item may still be more expensive than the same item at full price elsewhere. Always compare the final sale price against other retailers. Also watch for 'MSRP inflation' — some retailers artificially raise the original price before applying a discount to make the deal seem better than it is.