Percent Off Calculator
Calculate a sale price after one or two percent-off discounts and see the real combined percentage you save.
How to use the Percent Off Calculator
- Enter the original price.
- Enter the percent off.
- Enter the extra percent off (optional) – Applied to the already-reduced price.
- Enter the sales tax (optional).
- Press Calculate. The result updates automatically as you type.
About the Percent Off Calculator
Clearance tags often say "take an extra 20% off the lowest ticketed price." Shoppers tend to add the percentages, but stacked discounts multiply. Each one applies to whatever price is left after the previous discount, so the combined savings are always less than the simple sum.
The order does not matter: 40% then 20% gives the same result as 20% then 40%. What matters is that both are applied to a shrinking price. This calculator shows the real combined percentage, which makes it easy to compare a stacked deal with a single big discount elsewhere.
Results are estimates; a store's rounding rules may change the final cents.
Formula
Final price = Price × (1 − d1) × (1 − d2)
Combined discount = 1 − (1 − d1)(1 − d2)
Example: 40% off then an extra 20% off $120: 120 × 0.6 × 0.8 = $57.60, a combined discount of 52%, not 60%.
Example calculation
Using the default values:
- Original price = $120
- Percent off = 40%
- Extra percent off (optional) = 20%
the calculator returns:
- Final price: $57.60
- You save: $62.40
- Combined discount: 52%
- Price after first discount: $72.00
Frequently asked questions
Is 40% off plus 20% off the same as 60% off?
No. It equals 52% off, because the 20% is taken from the price that is already 40% lower.
How do I calculate 30% off in my head?
Find 10% by moving the decimal one place left, multiply by 3 and subtract. For $70: 10% is $7, 30% is $21, so the price is $49.
Does the order of discounts matter?
No. Multiplication is commutative, so the final price is the same either way.
Last updated: · Category: Financial calculators