Break-Even ROAS Calculator
Find the minimum Return on Ad Spend needed to cover your costs, based on profit margin.
Gross profit as a percentage of revenue (profit ÷ revenue × 100).
= 250% of ad spend needs to come back as revenue just to break even.
Break-Even ROAS = 1 / Profit Margin
Substitution: 1 / 40.00% = 1 / 0.4000 = 2.50x
With a 40.00% profit margin, your break-even ROAS is 2.50x (or 250% of ad spend returned as revenue) — every $1 in ad spend needs at least $2.50 in revenue just to cover the ad cost.
How Break-Even ROAS Works
Return on Ad Spend (ROAS) is revenue divided by ad spend. The break-even ROAS is the specific ROAS at which every dollar spent on advertising is exactly recovered by gross profit — no more, no less. Below it, ads lose money overall; above it, ads generate net profit after covering the cost of goods.
The formula is simply Break-Even ROAS = 1 ÷ Profit Margin, where profit margin is expressed as a fraction of revenue (e.g. 40% margin → 0.40). A thinner margin means you need a much higher ROAS just to break even: a 20% margin product needs a 5x ROAS to break even, while a 50% margin product only needs 2x.
Use this alongside your actual campaign ROAS to see how much of a safety buffer you have — and remember that break-even ROAS only accounts for cost of goods, not fixed overhead, returns, or platform fees, so many advertisers target a ROAS meaningfully above break-even.
Built and maintained by Meet Shah · Last updated
What this tool is used for
- Finding the ROAS at which a campaign stops losing money.
- Setting a target ROAS with a margin buffer above break-even.
- Working out the revenue a spend level needs to produce.
- Comparing break-even points across products with different margins.
- Producing a floor to judge campaign performance against.
Frequently Asked Questions
- How is break-even ROAS derived?
- It is 1 divided by your profit margin as a fraction. At a 40% margin, £1 of ad spend needs £2.50 of revenue to be covered exactly — because only 40p of each revenue pound is available to pay for advertising.
- Which margin should I use?
- Contribution margin — price minus every variable cost of fulfilling the sale, including goods, shipping, payment fees and returns. Using gross margin overstates what is available and produces a break-even target you will quietly miss.
- What happens at a zero or negative margin?
- There is no break-even ROAS. At zero margin no amount of revenue covers the spend, and at a negative margin each sale loses money before advertising is considered. The calculator says so rather than returning a number.
- What is the buffer against my target?
- How far your target ROAS sits above break-even — your margin for error. A target only slightly above break-even leaves nothing for a bad week, a rise in costs, or the gap between platform-reported and actual conversions.
- Should I aim for break-even ROAS?
- Only if the customer is worth more than the first order. Break-even means the campaign pays for itself and contributes nothing to overhead, which is a deliberate strategy when lifetime value is high and a slow bleed otherwise.
- Does this account for fixed costs?
- No — it covers variable cost only. Rent, salaries and software still have to come out of the contribution the campaign generates, so a genuinely profitable target sits meaningfully above the break-even figure.
Common errors and gotchas
- Computing break-even from revenue rather than from contribution margin, which is the figure that matters.
- Omitting variable costs such as shipping, returns and payment fees.
- Treating break-even as the target, which leaves no profit at all.
- Using a blended margin when the product mix varies substantially.
- Ignoring that customer lifetime value can justify operating below break-even on first purchase.