Discount Calculator
Calculate discounts, sale prices, and savings.
What do you want to calculate?
Inputs
Price before the discount
Percentage taken off the price
Quick Reference
Sale Price
What you pay after the discount
You Save
Total savings
Effective Discount
Off the original price
Breakdown
How it works
A discount calculator finds the sale price after a percentage is taken off, and how much you save. Multiply the price by the discount to get the saving, or by (1 − discount) to jump straight to the final price.
Sale price & saving
Saving = Price · (discount% ÷ 100) Sale price = Price · (1 − discount% ÷ 100)
- Price
- original price
- discount%
- percent off
Worked example
- Original price = $80
- Discount = 25%
- Saving = 80 × 0.25 = $20
- Sale price = 80 × 0.75
$20 off → you pay $60.
Good to know
- Stacked discounts multiply, they don't add: 20% off then 10% off is 0.8 × 0.9 = 28% off, not 30%.
- A discount is taken before sales tax, which is then applied to the lower price.
- To find the original price from a sale price, divide by (1 − discount).
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Frequently Asked Questions
How do I calculate a percent-off price?
Multiply the original price by (1 − discount): 25% off $80 is 80 × 0.75 = $60, saving $20. Equivalently, the saving is price × discount and the sale price is what remains.
How do stacked discounts work?
They multiply rather than add: 20% off followed by an extra 10% off leaves 0.8 × 0.9 = 72% of the price — a 28% total discount, not 30%. The order of percentage discounts does not change the result.
How do I find the original price from a sale price?
Divide by (1 − discount). If something costs $60 after 25% off, the original was 60 ÷ 0.75 = $80. Adding 25% back to $60 gives the wrong answer ($75) — a classic percentage trap.
What is a BOGO deal really worth?
Buy-one-get-one-free equals 50% off — but only if you buy two and wanted two. BOGO 50% off works out to just 25% off across the pair, which is why retailers favor phrasing deals this way.
Is sales tax applied before or after the discount?
For store discounts and sale prices, tax is normally charged on the reduced price you actually pay. Treatment of manufacturer coupons can vary by state, but the general rule is that the discount comes first, then tax on the remainder.