The Best Free ROAS Calculators: An Honest Comparison

How this comparison was done

Each tool below was reviewed in October 2026 by reading its page directly: which inputs it asks for, which outputs it shows, whether the formulas are displayed, whether any signup or email gate stands between you and the result, and what the page says about tracking and data handling. No accounts were created and no payments were made — "free" here means you can get a result without paying.

Every calculator was judged on the same six criteria: does it show the formula, does it compute break-even ROAS, does it compute maximum CPA, does it require signup, what ads or tracking surround it, and does it handle margins and refunds. Worked examples in this article use one illustrative scenario so the tools are comparable: $10,000 ad spend, $35,000 attributed revenue, 40% gross margin.

These numbers are illustrative, not benchmarks. A 3.5× ROAS is not "good" or "bad" until it is measured against your own break-even point.

Side-by-side comparison

The calculators in detail

1. MetricClue — the step-by-step one (this site)

The home-page calculator takes ad spend and attributed revenue and returns ROAS as a multiple and a percentage, then walks through a break-even section: order revenue minus product cost, shipping, transaction fees, and other costs gives maximum CPA, and order revenue divided by maximum CPA gives break-even ROAS. Every formula is printed next to the result it produces.

Honest strengths: the only tool here that shows each line of arithmetic rather than just the answer; the only one with a dedicated maximum CPA calculator; no signup, no email gate, and the tool page carries no agency sales pitch. Honest weaknesses: there is no dedicated refund or return-rate input (you would put it under "other cost"), no LTV-adjusted view, and no Amazon ACoS toggle. If your economics live and die by returns, Grow with BA models them more directly.

2. Adscriptly — the cleanest quick check

Adscriptly's page states its three formulas outright — ROAS equals revenue divided by spend, break-even ROAS equals 1 divided by gross margin, profit equals revenue times margin minus spend — and notes that all math runs in the browser with nothing stored or sent anywhere. Enter spend, revenue, and gross margin; get ROAS, the ROAS you actually need, and whether the campaign made money.

Best for: a fast, no-noise ROAS and break-even check when you already know your margin. Limitation: margin is a single gross-margin input, so fulfillment, shipping, and returns are all folded into one number you must compute yourself.

3. Top Growth Marketing — the agency workhorse

TGM's tool pairs the standard inputs (ad spend, revenue, optional gross margin) with a rich results panel: ROAS as a multiple and percentage, ACoS, cost per $1 of revenue, break-even ROAS, gross profit, profit per $1 of spend, and a plain-English verdict ("above break-even" or not). The surrounding guide is genuinely educational, including a ROAS-vs-MER-vs-ROI-vs-CAC explainer.

Best for: DTC media buyers who want one page that both calculates and teaches. Watch out for: the page publishes DTC benchmark tables drawn from the agency's own client portfolio. Treat those as one agency's experience, not as targets — a benchmark cannot tell you whether your 3.5× clears your break-even.

4. Grow with BA — the deepest cost model

This is the most thorough free tool of the seven on cost structure. Beyond spend and revenue it asks for average order value, gross margin, fulfillment cost per order, and return rate, then returns contribution margin, contribution per order, estimated orders, CAC per order, gross profit, fulfillment totals, and estimated return losses. The FAQ states plainly that everything runs in the browser and nothing is stored.

Best for: planning with real order economics — it is the only tool here that prices returns explicitly instead of leaving them to you. Limitation: the formulas are described as "standard" in the FAQ rather than displayed step by step in the tool, so you see verdicts more than arithmetic.

5. RootAMZ — the Amazon seller's pick

Built for Amazon PPC, RootAMZ shows the ROAS formula, converts the result to an ACoS equivalent, and adds a performance rating with target ROAS guidance. It explains break-even ROAS as 1 divided by net margin, with the worked logic that a 25% net margin needs at least 4× to break even.

Best for: Amazon sellers who think in ACoS and want the ROAS translation for free. Watch out for: the performance rating uses fixed bands (6×+ "excellent", under 2.5× "likely unprofitable"). Fixed bands cannot be right for every margin — at a 15% net margin, even a 6× ROAS loses money. Use the break-even explainer on the same page instead of the rating.

6. Taylor Sicard — the break-even specialist

The most conceptually ambitious tool here. It computes three numbers from your contribution margin: break-even ROAS (1 ÷ margin), profit-target ROAS (1 ÷ (margin − the share of revenue you want to keep)), and an LTV-adjusted floor (1 ÷ (margin × lifetime orders)). The page shows a full worked example — at a 38% margin with 1.8 lifetime orders, break-even is 2.6×, the profit target is 3.6×, the first-order LTV floor is 1.5× — and explains why contribution margin beats gross margin for this job.

Best for: anyone setting targets rather than just measuring — the profit-target and LTV variants are genuinely more useful than a single break-even number. Watch out for: the three numbers display without signup, but the full written breakdown report asks for your email. Decide whether the report is worth the newsletter.

7. Enalitica — the blended-view purist

Enalitica's calculator is the only one here built around the distinction between blended ROAS (total revenue ÷ total ad spend) and MER (total revenue ÷ ad spend plus agency fees, tools, and creative costs). It documents every formula, sets break-even MER at 1 ÷ gross margin, and adds a 1.4× target multiplier for actual profit. The page states that everything runs in the browser.

Best for: judging marketing as a whole rather than grading one channel — and the only tool that prices your agency retainer into the efficiency number. Limitation: it cannot tell you which channel earned the sale; that is the known trade-off of every blended metric.

Verdict: which one should you use?

There is no single winner, because the tools answer different questions. Match the tool to your question:

Just need a quick ROAS number with the math visible? Adscriptly. Fastest path from inputs to an answer you can audit.

Planning with real order costs, including returns? Grow with BA. Its fulfillment and return-rate inputs are the most complete free cost model here — more complete than ours.

Selling on Amazon? RootAMZ for the ACoS translation, but ignore the fixed performance bands and compute your own break-even from your net margin.

Setting targets, not just measuring? Taylor Sicard. The profit-target and LTV-adjusted variants are the most sophisticated free break-even thinking available; just know the detailed report costs an email address.

Judging all of marketing together? Enalitica. Nothing else here separates blended ROAS from MER or includes agency costs.

Want every calculation step shown, plus maximum CPA, with no signup and no pitch? MetricClue — this site's calculator. That is the trade we chose: full transparency on the tool, monetized elsewhere.

And an honest admission: two things competitors do better than we do. Grow with BA models return rates explicitly where we leave them to "other cost," and Taylor Sicard's LTV-adjusted break-even answers a question our calculator does not ask. We would rather tell you that than pretend otherwise.

Examples are illustrative, not client results or benchmarks. The calculations use the inputs shown; real-world decisions depend on your records and assumptions. Competitor tools were reviewed in October 2026; their pages may have changed since. Report a correction.