Discount Calculator
Calculate the sale price after a percentage discount, find what percentage off an item is, or work backwards from a sale price.
Frequently Asked Questions
How do I calculate a percentage discount?
Multiply the original price by the discount percentage, then subtract from the original. Formula: Sale Price = Original × (1 − Discount%). Example: 25% off $80 = $80 × 0.75 = $60. You save $20. Mental shortcut: 25% off means you pay 75% of the price.
What is 20% off $50?
20% off $50 = $40. You save $10. Quick method: 10% of $50 = $5, doubled = $10 discount. Final price: $50 − $10 = $40. This calculator handles any combination: enter 50 as original price and 20 as discount percentage.
How do I find the original price before a discount?
Divide the sale price by (1 − discount%). Example: if an item is $75 after a 25% discount: original = $75 ÷ 0.75 = $100. Use the 'Find Original' mode above — enter the sale price and discount percentage.
What percentage off is a sale price?
Subtract the sale price from the original, divide by the original, multiply by 100. Formula: Discount% = ((Original − Sale) ÷ Original) × 100. Example: original $120, sale $84: (36/120) × 100 = 30% off. Use the 'Find %' mode above.
How do I calculate multiple discounts stacked?
Apply discounts sequentially, not additively. A 20% discount followed by a 10% discount is NOT 30% off. Example: $100 → −20% = $80 → −10% = $72. Total savings: $28 (28% off, not 30%). To combine: (1−0.20) × (1−0.10) = 0.72 = 28% total discount.