How to use the Discount percentage calculator
Enter original price, and sale price. Choose the currency for your inputs and read the result as you change the values.
How it works and formula
Discount percentage = 100 × (original price − sale price) ÷ original price.
Worked example
| Original price | 100 |
|---|---|
| Sale price | 75 |
Result
Discount 25.00%
Choosing your inputs
Compare the original and sale prices for the same item, quantity and tax basis. Enter the actual prices shown on the offer. The original price must be greater than zero and the sale price cannot exceed it.
How to interpret the result
A reduction from $100 to $75 saves $25, so the discount is 25%. A $25 reduction on a $200 item is only 12.5%. Use the original price as the denominator when checking a promotion.
Frequently asked questions
Which prices should I compare?
Use the same quantity and the same tax basis for both prices. The original must be positive.
What if the sale price equals the original price?
The discount is zero because the difference between the two prices is zero.