GUIDE · 2026-07-23
How to use the Discount Calculator
A 10% coupon after a 30% sale does not equal 40% off; it is applied to the already reduced price, producing 37% off. The calculator separates final price, savings and effective discount.
How it works
List price × (1 − discount) × (1 − extra discount) = final price
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Step-by-step
- 01Enter the list price used as the comparison base.
- 02Enter the sale discount and additional coupon in their order of application.
- 03Review the final price, total savings and effective rate.
Worked example
INPUTList price 100; 30% off plus another 10%
RESULTFinal 63; savings 37; effective discount 37%
The rates apply to different price bases and should not simply be added.Limits and checks
- Account separately for fixed coupons, caps and minimum-spend rules.
- Check whether tax and shipping are calculated before or after discounts.
Useful examples
- Check a 30% sale price
- Add a 10% coupon after a sale
- Compare effective discounts
Frequently asked questions
Do 30% and 10% discounts equal 40% off?
No. Applied one after another, they produce an effective discount of 37%.
Which currency does this use?
It calculates plain numbers, so you can use dollars, won, pounds or any other currency.