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Free ROAS Calculator

Work out return on ad spend, find the break-even ROAS your margin actually requires, and convert between ROAS and ACoS. No sign-up required.

Work out

Revenue from ads

Ad spend

Gross profit margin % (optional)

The ROAS formula, and how to use it

The ROAS formula is one division, and this ROAS calculator applies it in all three directions:

ROAS = Revenue / Ad spend

ROAS stands for return on ad spend. The result is a plain multiple, so 4 means four units of revenue for every one spent. You will see the same figure written three ways, and they all mean the same thing: 4x, 4:1, and 400%.

Worked example. A campaign spent $2,500 and produced $10,000 in tracked revenue. That is 10,000 divided by 2,500, giving a ROAS of 4.

The formula rearranges the usual two ways. To find the revenue a target ROAS implies, multiply the ROAS by your spend. To find the spend you can afford at a target ROAS, divide the revenue by it. The calculator handles all three so nothing needs rearranging by hand.

What is a good ROAS? The honest answer

The number repeated everywhere is 4:1. It is worth understanding where that came from, because it is not a law of nature: 4:1 is the break-even point for a business with a 25% gross margin. Somewhere along the way a break-even figure for one kind of business became general advice for every kind.

A ROAS on its own cannot tell you whether you made money, because it compares revenue to ad spend and ignores what the goods cost you. Two businesses reporting the identical 4x ROAS can be in completely different positions:

A software business at 85% margin. Break-even is about 1.2x, so 4x is very profitable.
A retailer at 25% margin. Break-even is exactly 4x, so 4x earns nothing at all.
A low-margin reseller at 15%. Break-even is 6.7x, so 4x is losing money on every order.

This is why the calculator above asks for your gross margin, and why it gives you a verdict rather than only a ratio. It is the one input that turns a ROAS from a number into an answer.

Break-even ROAS, the number that makes the target real

Break-even ROAS is the return at which ad spend exactly consumes the gross profit from the sales it created. Above it you are making money, below it you are buying revenue at a loss.

Break-even ROAS = 1 / Gross margin

The derivation is short enough to be worth seeing. With revenue R, ad spend A and gross margin m, gross profit is R times m. Break-even is where that equals the ad spend, so R times m equals A. Rearranged, R divided by A equals 1 divided by m, and R divided by A is the ROAS.

So a 40% margin needs 2.5x, a 25% margin needs 4x, and a 10% margin needs 10x. The lower your margin, the harder advertising has to work before it contributes anything, which is why thin-margin businesses struggle to make paid acquisition pay at all.

The break-even mode above also takes a target net margin, so you can ask the more useful question: not what do I need to survive, but what do I need to hit the profit I actually want.

ROAS, ACoS and TACoS

Three metrics, one underlying performance, and a lot of avoidable confusion. Amazon reports ACoS, Google and Meta buyers talk about ROAS, and they are reciprocals of each other.

ROAS is revenue divided by ad spend. Higher is better.
ACoS is ad spend divided by revenue, as a percentage. Lower is better. A 25% ACoS is a 4x ROAS.
TACoS is ad spend divided by total revenue, organic included.

TACoS is the one worth watching over time, because ACoS can look perfectly healthy while advertising quietly becomes the only thing selling anything. If your ACoS holds steady but your TACoS keeps climbing, your organic demand is shrinking and the ads are covering for it. A TACoS that falls while total sales rise is the pattern you want, and it is the clearest signal that organic is doing real work.

How to improve ROAS, and where the ceiling is

Only two things move ROAS: more revenue from the same spend, or the same revenue from less spend. Everything practical falls under one of those.

Fix the landing page first. Conversion rate multiplies across every campaign pointing at it, so it is usually the fastest lever available.
Cut what spends without converting. Search terms, placements and audiences that consume budget and return nothing are dragging the average down.
Raise average order value. Bundles, upsells and thresholds increase the revenue side without touching the spend side.
Check attribution. Platforms credit themselves generously. Some of a strong reported ROAS is often revenue that would have arrived anyway.

There is a structural ceiling worth naming. Paid acquisition charges you again for every sale, so improving ROAS means renting the same traffic more efficiently rather than owning it. Organic works the other way: the cost is incurred once when the page is created, and the visits it earns afterwards are free. That is not an argument against paid advertising, which buys speed and control organic cannot. It is an argument for not letting the ad account be the only way customers can find you.

Frequently asked questions

How do you calculate ROAS?

Divide the revenue the ads produced by what you spent on them. The ROAS formula is ROAS = revenue / ad spend. A campaign that spent $2,500 and generated $10,000 has a ROAS of 4, usually written 4x, 4:1 or 400%. The calculator above works it out instantly and can also work backwards if you know the ROAS and need the revenue or the spend.

Is a 2.5 ROAS good?

It depends entirely on your margin, and anyone answering without asking is guessing. At a 50% gross margin, a 2.5x ROAS is profitable: every unit of ad spend returns 1.25 in gross profit, so you keep 0.25 after the ads pay for themselves. At a 30% margin the same 2.5x ROAS loses money, because break-even there is 3.33x. Enter your margin in the calculator above and it will tell you which side of the line you are on.

What does 4:1 ROAS mean?

It means four units of revenue for every one spent on advertising, so a $1,000 spend produced $4,000 in sales. It is the same thing as a 4x ROAS or 400% ROAS. What it does not tell you is whether you made any money, because that depends on what those sales cost you to fulfil. At a 25% gross margin, 4:1 is exactly break-even.

What is considered a good ROAS ratio?

The figure quoted most often is 4:1, and it is repeated so widely that it has become a rule of thumb detached from where it came from. It is only meaningful for businesses with roughly a 25% gross margin, where 4:1 happens to be break-even. A software business at 85% margin is profitable at 1.2x. A retailer at 15% margin needs 6.7x just to stand still. Work out your own break-even and judge against that instead.

What is break-even ROAS?

The ROAS at which your ad spend exactly consumes the gross profit from the sales it produced, so you finish level. The formula is break-even ROAS = 1 / gross margin. A 40% margin gives a break-even of 2.5x, a 25% margin gives 4x, and a 10% margin gives 10x. Everything above your break-even is profit and everything below it is a loss, which is why it is the only number that makes a ROAS target meaningful.

What ROAS is 25% ACoS?

A 4x ROAS. ACoS and ROAS are reciprocals: ACoS is ad spend divided by revenue while ROAS is revenue divided by ad spend, so ACoS = 100 / ROAS when written as a percentage. A 25% ACoS means ads cost a quarter of the revenue they generated, which is the same as making four times what you spent. The ACoS mode above converts between the two.

What is the difference between ACoS and TACoS?

ACoS measures ad spend against only the revenue the ads are credited with. TACoS measures the same spend against your total revenue, organic sales included. The difference matters because ACoS can look stable while advertising quietly becomes the only thing selling anything. A TACoS that falls while total sales rise is the healthy pattern: it means organic demand is carrying more of the load and you are less exposed if you pause spending.

Is ROAS the same as ROI?

No, and conflating them flatters your numbers. ROAS compares revenue to ad spend and ignores everything else, including the cost of the goods sold. ROI compares profit to total investment. A 3x ROAS sounds like a 200% return but may be a net loss once the cost of goods, shipping and overheads are counted. ROAS is a media efficiency metric, not a profitability one, which is exactly why the calculator above asks for your margin.

How do I improve my ROAS?

Either earn more revenue from the same spend or spend less for the same revenue. In practice that means raising conversion rate on the pages the ads point at, improving targeting so fewer clicks are wasted, cutting the keywords and placements that spend without converting, and raising average order value through bundling or upsells. Improving the landing page is usually the fastest of these, because it lifts every campaign pointing at it at once.

Why does my ROAS look good but my profit does not?

Almost always because the ROAS is being read without a margin. It is a revenue ratio, so it ignores the cost of the goods, shipping, payment fees, returns and overheads. A 4x ROAS on a product with a 20% margin is a loss. It can also happen through attribution: platforms credit themselves generously, so revenue that would have arrived anyway gets counted as ad-driven, which inflates the ratio without adding a penny.