Discount calculator
Work out a sale price in seconds, stack two discounts, add sales tax, or compare two offers to see which one really costs less.
Percent off calculator
Enter the price and the discount. Add a second discount or sales tax if you need them.
Compare two offers
Same cart, two deals: for example 15% off with free shipping against $10 off with paid shipping. See which one really costs less.
Offer ACheaper
Offer BCheaper
How the discount calculator works
All the maths runs in your browser. Nothing you type is sent anywhere.
Percent off
Sale price = Price × (1 − Discount ÷ 100)
You save = Price − Sale priceExample: $80 with 25% off is 80 × 0.75 = $60.00, a saving of $20.00.
Double discount
Final price = Price × (1 − D1 ÷ 100) × (1 − D2 ÷ 100)
Total discount = 1 − (1 − D1 ÷ 100) × (1 − D2 ÷ 100)Example: $80 with 25% off and then 10% off is 80 × 0.75 × 0.9 = $54.00. That is 32.5% off in total, not 35%.
Sales tax
Total = Sale price × (1 + Tax ÷ 100)Example: $54.00 with 8% tax is 54 × 1.08 = $58.32.
Comparing two offers
You pay = Cart − Discount + Shipping
Break-even cart = Amount off ÷ (Percent off ÷ 100)An offer only counts when the cart reaches its minimum spend; otherwise you pay the full cart plus the regular shipping cost. Example: on a $60 cart, 15% off with free shipping costs $51.00, while $10 off with $5.99 shipping costs $55.99, so the percent-off offer saves $4.99.
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Frequently asked questions
How do I calculate a percentage discount?
Multiply the price by one minus the discount as a decimal. For 25% off $80: 80 × 0.75 = $60, so you save $20.
Is 20% off plus another 10% off the same as 30% off?
No. Stacked discounts are applied one after the other, so the second one is taken off the already reduced price. 20% then 10% is 1 − (0.8 × 0.9) = 28% in total: $100 becomes $72, not $70.
Which is better, a percent off or a fixed amount off?
It depends on your cart. Divide the amount off by the percent as a decimal to get the break-even cart: 15% off beats $10 off once your cart is over $10 ÷ 0.15 = $66.67. Shipping and minimum spends can change the answer, so use the Compare two offers tool for your own cart.
Is sales tax added before or after the discount?
This calculator adds tax to the discounted price, which is how a store’s own coupon code is usually treated. Rules differ between states and countries, so check the total at checkout.
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