Percent Off Calculator
Type the original price and a percent off from 0 to 100, then press Calculate. The calculator shows the original price, the amount you save and the sale price. It rounds the sale price to the cent and takes the saving as the original price minus the sale price, so the two always add up to the original price shown.
How to use the Percent Off Calculator
- Enter your numbers in the Percent Off Calculator above.
- Press the Calculate button to see the result.
- To try other numbers, change any value and press the button again.
The percent-off formulas
Savings = Original × (% off / 100) · · · Sale price = Original − Savings = Original × (1 − % off / 100)
Multiply the original price by the discount fraction to get the saving, or by one minus the discount fraction to get the sale price directly. The calculator works out the sale price from the numbers as typed and rounds it half up to the cent. At exactly half a cent the sale price rounds up and the saving down, so 25% off $0.74 shows a sale price of $0.56 and a saving of $0.18.
Worked example
A $79.99 item at 35% off: savings = 79.99 × 0.35 = $28.00; sale price = 79.99 × 0.65 = $51.99. To check work: $28.00 + $51.99 = $79.99 (original price).
Frequently asked questions
How do I find the original price from the sale price?
Divide the sale price by (1 − discount). A $40 sale price at 20% off had an original of $40 / 0.80 = $50.
Do percentages combine when stacked?
No — stacked discounts multiply. 30% off then an additional 20% off equals 0.70 × 0.80 = 0.56, or 44% combined off, not 50%.
Does the sale price include sales tax?
No. The calculator adds no tax, so the sale price is the price before tax. To add tax to it, enter the sale price in the sales tax calculator.