Discount Calculator
Calculate discounts online for free. Find the discount amount, final sale price and total savings, or work out the discount percentage from the original and sale prices.
Choose a calculation
Your discount results
Original price:
Discount amount:
Price after discount:
Sales tax:
Total including tax:
Calculations are estimates. The calculator assumes the discount is applied to the original price and, when selected, sales tax is applied to the discounted price.
How to use the Discount Calculator
1. Choose Calculate Discount or Find Discount Percentage.
2. Enter the original price and discount percentage, or enter both the original and sale prices.
3. Optionally enter a sales tax rate and choose whether to include tax in the final price.
4. Click Calculate Discount to see your savings and final price. Use Copy Results to copy the calculation.
Discount calculation formulas
Discount amount: Original price × (Discount percentage ÷ 100)
Sale price: Original price − Discount amount
Discount percentage: ((Original price − Sale price) ÷ Original price) × 100
Sales tax: Price after discount × (Tax rate ÷ 100)
Total including tax: Price after discount + Sales tax
Frequently asked questions
How do I calculate a discount?
Multiply the original price by the discount percentage divided by 100. Subtract that amount from the original price to get the sale price.
How much is 20% off 100?
A 20% discount on 100 saves 20, leaving a sale price of 80 before any sales tax.
How do I calculate the discount percentage?
Subtract the sale price from the original price, divide the difference by the original price, then multiply by 100.
Can I include sales tax?
Yes. Enter the tax rate and select the option to include tax. The calculator applies tax to the discounted price.
Can I use this calculator on a mobile phone?
Yes. The layout adapts to smaller screens and works in modern mobile and desktop browsers.
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