Discount Calculator — Including Stacked Discounts

Discount Calculator

A single discount, or two stacked together — see the real final price, not a rough mental-math guess.

Original price & discounts

Original price

First discount

Additional discount (stacked)

Set the second discount to 0 if there's only one — stacked discounts apply to the already-discounted price, not the original.

Final price

$72.00

You save: $28.00
Combined discount: 28.0%

Two stacked discounts never simply add together — 20% off, then another 10% off, comes to 28% total savings, not 30%, since the second discount applies to a smaller starting amount.

A worked example

A $100 item with 20% off, then an additional 10% off, ends up at $72 — a combined 28% discount, not the 30% simple addition would suggest.

Frequently asked questions

Why doesn't 20% off plus 10% off equal 30% off?

The second discount applies to the price after the first discount, which is already smaller — 10% of a smaller number is a smaller dollar amount than 10% of the original price would have been, so the combined effect is always a little less than simple addition.

Does the order of stacked discounts matter?

No — mathematically, applying 20% then 10% gives the exact same final price as applying 10% then 20%. Multiplication is commutative, so the order you apply percentage discounts in doesn't change the result.

This calculator provides general estimates only.