Break-Even ROAS Calculator

What is break-even ROAS?

Break-even ROAS is the return on ad spend where the contribution profit available before advertising is fully consumed by advertising spend. At that point, post-ad contribution profit is approximately $0.00.

Break-even ROAS formula

Contribution Profit = Revenue - Non-Ad Variable Costs

Contribution Margin = Contribution Profit / Revenue

Break-Even ROAS = Revenue / Contribution Profit

Break-Even ACoS = Contribution Profit / Revenue x 100

Maximum Ad Spend = Contribution Profit

If current ROAS is supplied: Estimated Ad Spend = Revenue / ROAS. Estimated Profit After Ads = Contribution Profit - Estimated Ad Spend.

How contribution margin affects ROAS

A higher contribution margin leaves more room for advertising and lowers the ROAS needed to break even. A lower contribution margin means each ad dollar has to produce more revenue before the order stops losing money.

Break-even ROAS vs target ROAS

Break-even ROAS is the minimum order-level threshold based on the costs entered. A target ROAS may be higher if you want profit after ads, room for overhead, or a margin of safety.

Break-even ROAS vs ACoS

ROAS is revenue divided by ad spend. ACoS is ad spend divided by revenue. At break-even, break-even ACoS equals contribution margin, and break-even ROAS is approximately 1 divided by that margin as a decimal.

Maximum ad spend per order

Maximum ad spend is the contribution profit before advertising. If revenue is $100 and non-ad variable costs are $70, then $30 is available for advertising before the order reaches break-even.

Worked example

• Total non-ad costs: $30.00
• Contribution profit: $20.00
• Contribution margin: 40.00%
• Maximum ad spend: $20.00
• Break-even ACoS: 40.00%
• Break-even ROAS: 2.50x

How ecommerce sellers can use break-even ROAS

Sellers can compare current ROAS against the break-even threshold, estimate ad spend capacity per order, and identify products that need cost reductions or price changes before paid acquisition can work.

Limitations

This is an order-level economics estimate. It does not automatically account for income tax, fixed overhead, rent, software subscriptions, payroll, refunds, returns, discounts, customer lifetime value, repeat purchases, advertising attribution differences, incrementality, brand effects, or future cost changes. Break-even ROAS is useful, but it is not the only metric advertisers should use.

Frequently asked questions

What is break-even ROAS?

It is the ROAS where ad spend equals the contribution profit available before advertising, leaving approximately zero post-ad contribution profit.

How do I calculate break-even ROAS?

Subtract non-ad variable costs from revenue to get contribution profit, then divide revenue by that contribution profit.

What is the difference between ROAS and ACoS?

ROAS is revenue divided by ad spend. ACoS is ad spend divided by revenue. For example, 4.00x ROAS is equivalent to 25% ACoS.

How do I calculate maximum advertising spend?

Maximum ad spend per order equals contribution profit before ads: revenue minus non-ad variable costs.

Why does contribution margin affect break-even ROAS?

Contribution margin determines how much of each sales dollar remains for ads and profit. Lower margin products require higher ROAS to break even.

What happens if my costs are higher than my selling price?

The order is already losing money before advertising. The calculator shows no advertising room instead of returning a negative ROAS.

Is higher ROAS always better?

Higher ROAS usually means more revenue per ad dollar, but sellers should also consider volume, margin, attribution quality, customer lifetime value, and repeat purchases.

Does break-even ROAS include profit?

Break-even ROAS means post-ad contribution profit is approximately zero. A profitable target usually needs ROAS above break-even.

Should I include fixed business overhead?

This calculator is built for order-level variable economics. Fixed overhead can be considered separately or added into other variable costs only when you intentionally want to allocate it to an order.

Can I use this calculator for Meta, Google or TikTok Ads?

Yes. The math is platform-neutral and can be used for Meta Ads, Google Ads, TikTok Ads, Amazon Ads, and other paid advertising channels.