Target ROAS Calculator

Why break-even is not a target

Bidding at break-even means every order is worth exactly zero to you. You still pay for the warehouse, the software, the returns you did not predict and the tariff change you did not see coming. A target ROAS is break-even plus the room to survive being wrong.

Target ROAS = break-even ROAS × buffer multiple

Or, working from the margin you want instead:

Target ROAS = 1 ÷ (contribution margin − target net margin)

The two routes answer different questions. The buffer asks “how much cushion do I want against being wrong?” The margin route asks “what do I need this to earn?” Use the margin route when you have a number you must hit, and the buffer route when you are protecting against volatility rather than chasing a figure.

Choosing between the two modes

Buffer multiple

A multiplier on break-even. Bigger buffers mean fewer orders at higher confidence; smaller buffers mean more volume at thinner protection. The right size is a function of how volatile your costs are, not of what other people use.

Target net margin

The percentage of revenue you want to keep after everything, advertising included. This mode can return no answer at all, and that is a real result rather than an error — if your target margin is at or above your contribution margin, no advertising efficiency gets you there and the fix is price or cost.

Average order value

Only used to convert the target into a per-order cost ceiling. If your AOV moves a lot, bid on ROAS; if it is stable, the CPA figure is easier to act on day to day.

A worked example

Take a SKU breaking even at 2.13x — a contribution margin of 46.9%.

At a 1.5× buffer, target ROAS is 3.19x. On a $49 order that is a ceiling of $15.34 per acquisition, and you would set tROAS to 320% in Ads Manager.

Switch to the margin route and ask for 15% net: you need 1 ÷ (0.469 − 0.15) = 3.13x. Nearly the same answer by a different path, which is a good sign that both are sane.

Push the target to 40% net and the arithmetic still works, but the answer stops being useful: only 6.9 points are left for advertising, so you would need 14.4x. Push to 50% and the calculator returns nothing at all, because 50% is above the entire 46.9% contribution margin — there is no advertising efficiency that reaches it. Both cases are telling you the same thing, one loudly: that is not a bidding problem.

How much buffer is enough

Published guidance clusters around 1.5–2× break-even, and that range is a reasonable place to start. But it is a rule of thumb standing in for a question only you can answer: how far can your costs move before you notice?

Three things should push your buffer up. Volatile input costs — and in 2026, tariffs moved three times. Long lead times, because you are committing to costs months before you sell. And thin contribution margin, where small absolute changes are large relative ones.

One thing should push it down: a genuinely stable cost base with short lead times, where you can react faster than conditions change. Very few importers are in that position right now.

Next steps

Questions

What is a good target ROAS?

It is not a number you pick, it is a number your costs produce. A 70% contribution margin SKU targets comfortably below 2x; a 25% margin SKU needs 4x or more just to clear break-even with any cushion. Anyone quoting a universal target ROAS is quoting their own cost structure, not yours.

Should I put target ROAS into Ads Manager as a bid strategy?

You can, and the result panel gives you the percentage to enter. Two cautions: platform tROAS is measured on platform-attributed revenue, which is usually optimistic, so the real return will come in below the target you set. And setting it far above what the account has historically achieved can starve delivery entirely rather than improving efficiency.

Why does the margin mode sometimes return nothing?

Because the target is unreachable. If you want 40% net from a SKU with 46.9% contribution margin, only 6.9 points are left for advertising — meaning you would need a ROAS above 14x. The calculator says nothing rather than printing an absurd number, because the honest answer is that the target is wrong.

How often should I recalculate this?

Whenever an input to break-even moves — a supplier price change, a duty change, a shift in return rate. Not on a schedule. A target ROAS calculated against last quarter's landed cost is a target for a product you are no longer selling.

Does target ROAS work for a whole account?

Not directly. Target ROAS is a per-SKU or per-campaign figure. For the account level you want target MER, which is the same arithmetic applied to total revenue and total spend — including the organic and repeat revenue no ad platform will claim.

Sources and last update

Last verified 2026-08-22.

• TrueProfit — What's a Good ROAS in 2026
• EcomCalcTools — Ecommerce ROAS benchmarks by channel

Figures here are planning estimates. Duty applies per 10-digit HTS code and platform fees change without much notice — check your own broker and your own seller account before committing spend. Full workings on the methodology page.