Break-Even ROAS Calculator: The Minimum Ad Return You Need

Advertising numbers are easy to misread. A campaign that returns three times its cost sounds excellent, but if your margin is thin, three times can still lose money. Break-even ROAS is the number that cuts through this. It tells you the minimum return your ads must deliver for the store to break even, given your real costs.

How to use this calculator

1. Enter your selling price per order.
2. Enter your product cost and shipping or fulfilment per order.
3. Enter your payment fee, both the percentage and any flat amount per order.
4. Enter your refund or return rate.
5. Set a target profit margin after ads to see the return you should aim for.
6. Optionally enter your store conversion rate to see the most you can pay per click.

If your costs are not known precisely, use cautious figures. It is safer to underestimate profit than overestimate it.

The formulas

First, the profit available per order before any advertising, which we call the contribution:

• Fees = price × payment fee percentage + flat fee
• Refund loss = price × refund rate
• Contribution per order = price − refund loss − product cost − shipping − fees

Then:

• Break-even CPA = contribution per order
• Break-even ROAS = price ÷ contribution per order
• Target CPA = contribution − (price × target margin)
• Target ROAS = price ÷ target CPA
• Maximum cost per click = break-even CPA × conversion rate

ROAS here means revenue divided by ad spend, measured before refunds, which is how advertising platforms usually report it. The calculator confirms that spending exactly the break-even CPA per order leaves zero profit.

How to read your result

The break-even ROAS is your floor. If your campaigns return less than this, you are losing money on each order, before counting any fixed costs. The target ROAS is the level that leaves the profit margin you asked for. The gap between the two is your room for profit.

The break-even CPA is often easier to act on. If you know each order can only afford an advertising cost of a certain amount, you can judge every campaign, audience and creative against that ceiling. The maximum cost per click turns this into a practical limit for bidding: at your conversion rate, paying more per click than this makes the average order unprofitable.

If the calculator reports that there is no break-even, the order loses money before advertising begins. Advertising cannot fix that. The remedies are to raise the price, lower the product or shipping cost, or reduce refunds.

Why thin margins are dangerous

The relationship between margin and break-even ROAS is steep. As the profit per order shrinks, the return you need rises quickly, so a small increase in costs or refunds can push break-even ROAS beyond what advertising realistically delivers. This is one reason many new online stores lose money on advertising in their first months. Our guide to dropshipping and our comparison of affiliate marketing and dropshipping describe how margins, refunds and ad costs combine.

Use the profit margin calculator to test different selling prices before you commit to a campaign. A modest price change often moves break-even ROAS more than any optimisation of the ads themselves.

Common mistakes

Ignoring fees and refunds. They reduce the profit available for ads.

Using revenue instead of profit. ROAS is about revenue, but the threshold must come from profit.

Forgetting fixed costs. Break-even ROAS covers variable costs only. Subscriptions, software and your own time are extra.

Treating a platform's reported ROAS as truth. Attribution is imperfect, so cross-check against actual orders and payouts.

Copying someone else's target. Their margin is not yours.

Assumptions and limits

This calculator works per order and assumes the same price, cost and refund rate on every order. It treats a refunded order as returning the full price with product cost, shipping and payment fees not recovered, which is cautious. It ignores repeat purchases, average order value differences, discounts, taxes, chargebacks and fixed overheads. Repeat customers can justify a break-even ROAS below one on the first order, but only if you have evidence that they return. Treat the output as a discipline for judging campaigns, not a forecast, and be alert to schemes that promise easy advertising profits; see our guide to make-money-online scams.