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Discount Calculator
Store promotions often stack: an item discount, then an extra percentage at checkout. This calculator applies discounts in order so you see the real final price and how much you save at each step.
Last reviewed July 30, 2026.
When to use this
- Checking a “20% off + extra 10%” promotion before you buy
- Comparing a single coupon versus stacked codes
- Explaining to someone why sequential percents are not additive
Worked example
Jacket $120 with discounts 20%, then 10%. After 20%: $96. After another 10%: $86.40. Total saved: $33.60—not $36 (which would be a flat 30% off).
Common mistakes
- Adding stacked percents together (20+10) instead of applying them in sequence
- Forgetting shipping or tax that may still apply to the discounted goods
- Assuming every “extra 10% off” applies to the original price
How it works
Each discount multiplies the current price by (1 − percent ÷ 100). Steps are sequential. Savings are original price minus final price.
How to use
- Enter the original price.
- Enter one or more discount percents, separated by commas, in the order they apply.
- Review final price, total saved, and each step.
Related on this site
- Percentage Calculator — Find percent of a number, percent change, increases, and decreases.
- US Sales Tax Calculator — Add or remove sales tax using approximate rates for all 50 states and D.C.
FAQ
Why isn’t 20% then 10% the same as 30% off?
Because the second discount applies to the already-reduced price. 20% off $100 is $80; 10% of $80 is $8; final $72.
What order should I enter discounts?
Enter them in the same order the store applies them—usually item discount first, then cart-level extras.
Can I enter a dollar-off coupon?
This version is percentage-based. Convert a dollar coupon to an approximate percent, or subtract it mentally from the final price.
Does this include sales tax?
No. Pair it with the sales tax calculator if you need an after-tax total.
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