Advertising
Break-even ROAS formula for ecommerce
Break-even ROAS tells you the minimum return on ad spend required before a campaign stops losing money.
The simple formula
A common break-even ROAS formula is 1 divided by contribution margin. If contribution margin is 40 percent before ads, break-even ROAS is 2.5.
The exact model depends on what you include before ads, but the principle is clear: lower margin requires higher ROAS.
- 40 percent margin needs 2.5 ROAS
- 50 percent margin needs 2.0 ROAS
- 25 percent margin needs 4.0 ROAS
Use product-specific targets
A single account-wide target can hide the fact that some products need much stronger ROAS than others.
- Group products by margin
- Set thresholds before scaling
- Review bundles and discounts separately
Do not forget post-purchase costs
Refunds, support load, return shipping, and payment fees can change the true break-even point.
- Include refund pressure
- Account for payment fees
- Revisit targets after cost changes
Put it to work
Turn the guide into a profit operating view.
MarginCore connects ecommerce sales, ad spend, COGS, fees, refunds, and operational adjustments so teams can review profit with less spreadsheet cleanup.