How to calculate break-even ROAS from product costs
A revenue-to-ad-spend ratio tells you what the campaign sold. It does not, by itself, tell you whether it made money.
Open the Break-Even ROAS Calculator →Work out the contribution available for advertising
ROAS compares attributed revenue with advertising spend. It does not deduct product costs, postage, payment charges or returns. Start by subtracting those non-ad variable costs from revenue. The amount remaining is the maximum advertising allowance before the order's contribution reaches zero.
With £40 revenue and £25 non-ad variable costs, £15 remains for advertising. £40 divided by £15 gives 2.67× break-even ROAS when displayed to two places. That threshold covers the entered variable costs; it leaves nothing for general overhead or a further profit target.
Build a target that leaves room for the business
If you want £5 left from that example after advertising, the ad budget is £10 rather than £15. £40 revenue divided by £10 spend gives a 4× target under those assumptions. Write down the contribution you want to retain instead of choosing a benchmark because another seller uses it.
Use the same revenue basis in the ad report and calculation where possible. Gross sales including collected tax, cancelled orders or duplicated attribution may not match the revenue that belongs to the business. Keep those differences visible when assessing a campaign.
Compare products and returns before scaling
Two products with the same sales revenue may have different affordable advertising costs. One may take longer to make, cost more to deliver or be returned more often. Calculate the limit per product or a documented basket mix, then check the campaign's actual mix.
A profitable-looking attributed return also needs enough completed orders to be informative. Record the reporting window, cancellations and any later refunds. Scaling advertising increases spend immediately, while payouts and repeat purchases may arrive later or not at all.
A worked example
£40 revenue less £25 non-ad variable costs leaves £15. £40 ÷ £15 = 2.67× break-even ROAS before fixed costs.
Before you use the result
- Subtract all non-ad variable costs first.
- Keep collected tax and attribution differences clear.
- Choose a contribution amount to retain after ads.
- Review product mix, cancellations and returns.
- Test the cash required before increasing spend.
Common questions
Does 3× ROAS mean my ads are profitable?
It depends on the product's cost structure. A 3× return can exceed one product's break-even threshold and fall below another's. Calculate the threshold and include the wider contribution target before making the decision.
Can I include repeat purchases?
Only when you have measured evidence and a consistent attribution period. Do not assume every newly acquired customer will return. Keep the first-order calculation separate from any longer-term customer analysis.
Put the numbers into practice
Break-Even ROAS Calculator →How much can you spend to acquire a product order? →Cash flow vs profit: why a product can tie up cash →How to calculate product return costs and a return allowance →A practical calculation guide, not professional accounting, legal or tax advice. Examples are illustrative unless identified as official. Calculation methodology and limitations.