For Online Sellers

Discount Impact Calculator: How Many More Sales to Break Even?

Free tool · Updated October 2, 2026 · By CouponTalk · Reviewed by CouponTalk Expert Reviews on October 2, 2026

Your result

Enter your measurements to see your result.

Quick answer

A discount comes straight out of your margin. Extra sales needed = margin ÷ (margin − discount) − 1. With a 40% margin, a 10% discount needs 33% more sales to earn the same profit, a 20% discount needs 100% more, and any discount of 40% or more can never break even.

How to use this calculator

Enter your margin before the discount.
Enter the discount you plan to run.
See the extra units needed to keep the same profit.

Fee and rate table

Extra sales needed to keep the same profit
Margin	5% off	10% off	15% off	20% off	25% off
20% margin	+33%	+100%	+300%	Never	Never
30% margin	+20%	+50%	+100%	+200%	+500%
40% margin	+14%	+33%	+60%	+100%	+167%
50% margin	+11%	+25%	+43%	+67%	+100%

Fees and rates checked on 2 October 2026. Marketplaces revise rate cards often, so confirm current figures in your seller dashboard before you set prices.

Frequently asked questions

How much more do I need to sell if I give a discount?

Divide your margin by (margin − discount) and subtract 1. At a 30% margin, a 10% discount needs 50% more units sold.

Are sale discounts worth it?

They work when they bring new customers, clear old stock or win the Buy Box, but they rarely pay off on volume alone when the discount is close to your margin.