Discount Calculator
Find the sale price and how much you save, stack a second discount, or work out what percent off a sale price really is.
Sale price after a discount
What discount is it?
The formulas
sale price = original x (1 - discount / 100) you save = original - sale price percent off = (original - sale) / original x 100
Worked examples
| Question | Working | Answer |
|---|---|---|
| $80 at 25% off | 80 x 0.75 | $60 (save $20) |
| $100 at 20% then 10% off | 100 x 0.80 x 0.90 | $72 (28% off) |
| $120 reduced to $90 | (120 - 90) / 120 | 25% off |
The same sums apply to any percentage fall: see the percentage decrease calculator and the guide to percentage formulas.
Frequently asked questions
How do I calculate a sale price?
Multiply the original price by 1 minus the discount as a decimal. An $80 item at 25% off costs 80 x 0.75 = $60, so you save $20.
How do I find the percent off from two prices?
Subtract the sale price from the original, divide by the original, and multiply by 100. From $120 down to $90 is (120 - 90) / 120 x 100 = 25% off.
What do two discounts in a row add up to?
They multiply, they do not add. 20% off and then a further 10% off leaves 0.80 x 0.90 = 72% of the price, which is 28% off in total, not 30%. Use the extra discount box to see it.
How do I work out the original price from the sale price?
Divide the sale price by 1 minus the discount. If an item costs $60 after 25% off, the original price was 60 / 0.75 = $80.
Does it include sales tax?
No. The calculator works on the price you enter. Sales tax is usually added after the discount, so multiply the sale price by 1 plus your tax rate.