Discount Calculator
Calculate the sale price after a percentage discount. Find how much you save and what you'll actually pay. Also works in reverse — find the discount % from original and sale prices.
Part of our Math & Percentage Calculators collection.
Discount Calculator
Free online calculator
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How to Use This Calculator
- 1
Choose whether to calculate sale price or discount %.
- 2
Enter the original price.
- 3
Enter the discount % or sale price.
- 4
See the result and savings instantly.
Discount Formula
Sale Price = Original Price × (1 − Discount% / 100) Savings = Original Price − Sale Price Discount % = ((Original − Sale) / Original) × 100
Example Calculation
Example: 25% off a $120 item
Inputs
calcMode: salePriceoriginalPrice: 120discountPercent: 25
Result
Sale price: $90 | You save: $30
$120 × (1 − 0.25) = $120 × 0.75 = $90. Savings = $30.
Frequently Asked Questions
How do I calculate 20% off?
Multiply the original price by 0.80 (or 80%). For example, 20% off $50 = $50 × 0.80 = $40.
How do I stack multiple discounts?
Apply them sequentially, not additively. A 20% discount followed by a 10% discount = 0.80 × 0.90 = 0.72, which is a 28% total discount — not 30%.