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Break-Even ROAS Calculator

Finds the ROAS, ACOS and cost per sale at which advertising breaks even for your margin, and checks a live campaign against it.

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In short Break-Even ROAS Calculator is a free online tool on inputtesthub.com that finds the ROAS, ACOS and cost per sale at which advertising breaks even for your margin, and checks a live campaign against it. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the Break-Even ROAS Calculator

  1. Enter your figures in the input fields.
  2. The result updates as you type, together with the full working.
  3. Check the breakdown table to see exactly how the number was reached.

About the Break-Even ROAS Calculator

The Break-Even ROAS Calculator finds the ROAS, ACOS and cost per sale at which advertising breaks even for your margin, and checks a live campaign against it. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Setting a target ROAS before launching a campaign.
  • Deciding a maximum bid or cost per acquisition.
  • Judging whether a running campaign is actually profitable.

Details

Break-even ROAS1 ÷ contribution margin
Break-even ACOSEQUALS the contribution margin
At a 50% margin2× ROAS breaks even
At a 25% margin4× ROAS breaks even
ROAS × ACOSAlways 1

The maths behind it

This tool uses break-even ROAS = price ÷ contribution margin, and break-even ACOS is the contribution margin as a percentage of price. The two are the same fact stated upside down. Every intermediate value is shown on screen, so the result can be checked by hand.

This is single-order maths and it deliberately ignores repeat purchases. If customers come back, the honest comparison is lifetime value against acquisition cost, and a campaign that loses money on the first order can still be the best spend you make. It also assumes ad-attributed revenue is genuinely incremental, which is the assumption most likely to be wrong.

Where this tool stops

Overheads, salaries, returns and discounting sit below the contribution margin and are not modelled. Break-even here means the ad pays for itself, not that the business makes money.

Explained in our guides

All guides

Frequently asked questions

Is a 3× ROAS good?
It depends entirely on the margin it is measured against, which is why the number alone means nothing. At a 50% contribution margin, 3× is comfortably profitable. At a 25% margin, break-even is 4× and 3× is losing money on every sale — and scaling the campaign scales the loss.
What is the difference between ROAS and ACOS?
They are reciprocals. ROAS is revenue divided by spend; ACOS is spend divided by revenue expressed as a percentage. A 4× ROAS is a 25% ACOS. Amazon sellers talk in ACOS, everyone else in ROAS, and the confusion is purely dialect.
Is the Break-Even ROAS Calculator free?
It is free, with no account, no trial and no daily cap. Every calculators tool on inputtesthub.com works the same way: open the page and use it.
Is the Break-Even ROAS Calculator safe to use with private information?
No. The Break-Even ROAS Calculator runs entirely in your browser using JavaScript. Because the work happens locally, the tool also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
What is the equation behind the Break-Even ROAS Calculator?
It uses break-even ROAS = price ÷ contribution margin, and break-even ACOS is the contribution margin as a percentage of price. The two are the same fact stated upside down. The full working is printed under the result, so you can follow every step rather than trusting a black box.
What does a typical result look like?
Enter a 45 product costing 15 with 8 of shipping and fees and the Break-Even ROAS Calculator returns a 2.05× break-even ROAS, a 48.9% ACOS and 22 as the most you can pay for a sale.
What do people use the Break-Even ROAS Calculator for most?
The most common reasons people reach for it: setting a target ROAS before launching a campaign. Deciding a maximum bid or cost per acquisition. Judging whether a running campaign is actually profitable. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Is there anything the Break-Even ROAS Calculator cannot do?
Overheads, salaries, returns and discounting sit below the contribution margin and are not modelled. Break-even here means the ad pays for itself, not that the business makes money. Knowing where a tool stops being trustworthy matters more than the cases where it works.
What figures does the Break-Even ROAS Calculator work from?
Break-even ROAS is 1 ÷ contribution margin. Break-even ACOS is EQUALS the contribution margin. At a 50% margin is 2× ROAS breaks even. These are printed on the page itself, so you do not have to take them on trust.
Is the number rounded?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.

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