Discount Calculator
Enter the original price and the discount percentage to see how much you save and what you pay. The calculator also works for a 100% discount, which leaves a final price of 0, and it will warn you if the discount is greater than 100%.
Discount Calculator
Enter an original price and a discount percentage to see the amount saved and the final price.
Result
The discount formulas
Step-by-step
- Convert the discount to a decimal by dividing by 100.
- Multiply the original price by that decimal to get the amount saved.
- Subtract the amount saved from the original price to get the final price.
Practical examples
Discount amount: 100 × 0.20 = 20. Final price: 100 − 20 = 80.
Discount amount: 99.99 × 0.15 = 14.9985. Final price: 84.9915.
If you already know the sale price and the discount, use the reverse percentage calculator: original = sale price ÷ (1 − discount ÷ 100).
When to use this calculator
- Checkout maths, sale signs, and invoices where the list price and the discount percent are known.
Common mistakes
- Applying a second discount to the original price instead of to the already-reduced price, if two discounts are meant to be sequential.
- Confusing “$20 off” (an amount) with “20% off” (a percentage of the original).
Frequently asked questions
How do I find the original price before a discount?
Divide the sale price by (1 − discount ÷ 100). A price of 80 after 20% off came from 100. The reverse percentage calculator is built for that step.
What is the shortcut for the final price?
Multiply the original by (1 − P ÷ 100). 20% off is the same as paying 80% of the original.