Percentage calculator (percent of and % change)
Work out X% of Y, what percent one number is of another, and percentage change.
What does the discount calculator do?
This discount calculator works in both directions: enter the original price and the percentage off to get the sale price and your savings, or enter both prices to find the discount percent. You can stack a second discount, which is taken off the already reduced price, and add sales tax to the final amount.
How to use the discount calculator
- Choose whether you know the discount percent or the sale price.
- Enter the original price and the discount percent, or the original and sale prices. A decimal point or a decimal comma both work.
- If you need them, add a second discount (applied after the first) and a tax rate to add to the final price.
- Read the sale price, the amount saved and the working, and copy any figure.
Your privacy
All calculations run in your browser. The prices you enter are not sent or stored anywhere.
Frequently asked questions
How do I calculate a discount?
Multiply the original price by (1 − discount ÷ 100). A 25% discount on 120 is 120 × 0.75 = 90, so you save 30.
Are two 20% discounts the same as 40% off?
No. The second discount is taken off the already reduced price. 20% off 100 is 80, and another 20% off 80 is 64: 36% off in total, not 40%.
How do I find the discount percent from two prices?
Subtract the sale price from the original price, divide by the original price and multiply by 100. From 80 to 60 is (80 − 60) ÷ 80 × 100 = 25% off.
Is tax added before or after the discount?
This calculator adds tax to the final, discounted price. How coupons and discounts interact with tax depends on where you are and the type of discount, so check your receipt when the exact amount matters.