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ROAS & break-even calculator

Check return on ad spend alongside contribution, entered costs, and your break-even ad budget.

Your inputs

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Inputs are processed locally. Do not enter personal information or confidential campaign parameters.

Your result

Enter your figures and calculate to see your result.

Formula and example checked against automated tests · 15 November 2026

Revenue is only part of the picture

ROAS measures attributed revenue for each unit spent on advertising. It does not deduct product costs, shipping, payment fees, or overhead. Enter revenue and spend for the same attribution window, then include the variable costs of the sales counted in that revenue. Add allocated fixed costs to see a fuller profit estimate.

The formulas

ROAS = attributed revenue ÷ ad spend
Contribution before ads = revenue − variable costs
Profit after entered costs = revenue − variable costs − ad spend − fixed costs
Break-even ROAS before fixed costs = revenue ÷ (revenue − variable costs)
Break-even ad budget including fixed costs = revenue − variable costs − fixed costs

A worked example

With 5,000 in attributed revenue, 1,000 ad spend, 3,000 variable costs, and 500 fixed costs, ROAS is 5× and profit after entered costs is 500. Profit margin after ads is 10%. The break-even ROAS before fixed costs is 2.5×, and the ad budget that leaves zero profit at the entered revenue and costs is 1,500.

Use a consistent attribution window

Compare like with like. Refunds, tax treatment, delayed purchases, and overlapping platform attribution can distort revenue. Avoid adding revenue reported by multiple ad platforms without checking for duplicate conversions. This tool does not access ad accounts, validate attribution, or estimate incremental lift.

The break-even ROAS figure assumes the variable cost ratio remains constant and excludes fixed costs. The separate ad-budget figure includes fixed costs at the revenue you entered. It is a scenario calculation, not a forecast of what increasing spend will generate.

Is a high ROAS always profitable?

No. A business with high product costs can lose money even with apparently strong ROAS. Look at contribution and the profit remaining after all relevant costs.

Why is break-even unavailable?

If revenue is zero or variable costs equal or exceed revenue, there is no positive contribution to fund ads. A negative ad allowance means the entered costs exceed revenue before ads.

Reference: Omni Calculator’s ROAS explanation. The fixed-cost scenario here is shown separately.

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