Marketing
ROAS Calculator
Return on ad spend — the revenue each dollar of advertising brings back. Add your margin and it also finds the break-even ROAS you need to actually turn a profit, plus net profit and ACOS.
Enter your numbers
Sales attributed to the campaign
$
What you paid for the ads
$
Add it to see break-even ROAS and net profit
%
Return on ad spend
4×4:1 · 400%
Thin / break-even
0×break-even 3.33×8×+
$4 of revenue comes back for every $1 of ad spend.
Break-even ROAS
3.33×
Net profit
$400
ACOS
25%
Revenue / $1
$4
Try an example
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The basics
What is ROAS?
ROAS — return on ad spend — answers one question: for every dollar you put into advertising, how much revenue came back? It is the headline efficiency metric for paid media, but on its own it only describes the top line. Pair it with your profit margin and it tells you whether the campaign actually made money.
ROAS = revenue ÷ ad spend
The core formula
Divide the revenue a campaign generated by what you spent on it. The result is a multiple — read 4× as “four dollars back per dollar in.” The same number can be shown as a ratio or a percent.
$8,000 ÷ $2,000 = 4× (4:1, 400%)
break-even = 1 ÷ margin
Why margin matters
Revenue is not profit. Your margin sets the break-even point — the ROAS at which gross profit just covers the spend. Beat it and you profit; miss it and you lose money even above 1×.
25% margin → 1 ÷ 0.25 = 4× to break even
Method
How to calculate ROAS by hand
Three steps take you from raw numbers to a verdict on whether the spend paid off.
- 1
Add up campaign revenue and spend
Pull the sales attributed to the campaign and the total you paid for those ads over the same window. Keep the time periods aligned.
revenue = $8,000 spend = $2,000 - 2
Divide revenue by spend
ROAS is revenue divided by ad spend. The result is a multiple you can also read as a ratio (4:1) or a percent (400%).
$8,000 ÷ $2,000 = 4× (4:1, 400%) - 3
Compare against break-even
Invert your margin to get the break-even ROAS, then check your result against it. Above the line is profit; below it is a loss.
1 ÷ 25% = 4× break-even → 4× breaks even
Worked examples
See it across business types
The same arithmetic, very different verdicts — because break-even ROAS rides entirely on margin. Switch tabs to see why a 1.2× can lose money while a 2.4× prints profit.
Given revenue = $8,000, spend = $2,000, margin = 30%
ROAS = $8,000 ÷ $2,000 = 4× (400%)
Break-even = 1 ÷ 30% = 3.33×
Net profit = $8,000 × 30% − $2,000 = $400
ROAS = 4× ≥ break-even 3.33×
A store with a 30% margin needs a 3.33× ROAS to break even — a 4× clears it, so the campaign profits.
Quick chart
What ROAS do you need at each margin?
The fastest way to set a target: find your profit margin, read across to the break-even ROAS, then add the slice of profit you want to keep.
Profit you want to keep
ROAS that keeps 10% of revenue as profit| Profit margin | Break-even ROAS | Target ROAS (+10%) | Max ACOS |
|---|---|---|---|
| 10% | 10× | — | 10% |
| 15% | 6.67× | 20× | 15% |
| 20% | 5× | 10× | 20% |
| 25% | 4× | 6.67× | 25% |
| 30% | 3.33× | 5× | 30% |
| 40% | 2.5× | 3.33× | 40% |
| 50% | 2× | 2.5× | 50% |
| 60% | 1.67× | 2× | 60% |
| 70% | 1.43× | 1.67× | 70% |
| 80% | 1.25× | 1.43× | 80% |
Break-even ROAS is simply 1 ÷ margin. At a 25% margin you need 4× (400%) just to cover costs; the max ACOS column is the mirror image — the highest ad-cost-of-sales you can afford before the campaign loses money.
Where it shows up
Where ROAS is used
Every paid-media platform reports a version of this number — the labels and attribution windows differ, but the math is the same.
Purchase ROAS
Meta & Google Ads
Reported per campaign as conversion value divided by spend. Watch the attribution window — a 7-day click claim flatters ROAS versus 1-day.
ROAS = 1 ÷ ACOS
Amazon Ads
Amazon optimises on ACOS, the inverse of ROAS. Sellers set a target ACOS ceiling that maps directly to a minimum ROAS.
Blended ROAS
Agency reporting
Agencies report blended ROAS across all channels for the client view, and per-channel ROAS to decide where the next dollar goes.
Worth knowing
Rules worth remembering
A handful of relationships make ROAS easy to reason about — and a few traps make it easy to misread.
ROAS > 1 ≠ profit
Positive is not profitable
Clearing 1× only means revenue beat spend. You profit only above the break-even set by your margin, which is almost always well over 1×.
ROAS = 1 ÷ ACOS
ROAS and ACOS are inverses
A higher ROAS is a lower ACOS. Convert freely: 4× is the same target as a 25% ACOS.
break-even = 1 ÷ margin
Margin sets the bar
Thin margins demand a high ROAS; fat margins forgive a low one. The bar moves with the business, not with the platform.
blended vs per-channel
Mind the blend
Branded search inflates blended ROAS with sales you would have won anyway. Judge new spend on incremental, not blended, return.
window matters
Attribution shifts the number
The same campaign reports different ROAS under different attribution windows and models. Compare like with like.
target = 1 ÷ (margin − profit%)
Build in profit
To keep a margin of profit rather than just break even, widen the divisor by the profit slice you want to retain.
Reference
ROAS, ACOS, break-even, and ROI
Four numbers people mix up. Here is exactly what each one measures and how it relates to the others.
revenue ÷ spend
ROAS
Revenue per dollar of ad spend — a pure top-line measure of advertising efficiency, shown as a multiple, ratio, or percent.
$8,000 ÷ $2,000 = 4×
spend ÷ revenue
ACOS
The inverse of ROAS as a percent — the share of revenue eaten by ad cost. Lower is better; it is Amazon’s preferred lens.
$2,000 ÷ $8,000 = 25%
1 ÷ margin
Break-even ROAS
The ROAS at which gross profit equals ad spend. Below it you lose money even with a return above 1×.
1 ÷ 25% = 4×
profit ÷ total cost
ROI
Return against everything invested, not just ads. ROAS can look healthy while ROI is negative once all costs come out.
profit ÷ (COGS + spend + overhead)
Pitfalls
Common ROAS mistakes
Most bad ROAS decisions trace back to one of these — easy to avoid once you know them.
Chasing ROAS instead of profit
Maxing ROAS usually means under-spending on the highest-intent audiences. The most profitable campaigns often run at a lower ROAS but far more volume. Optimise total profit, not the multiple.
Comparing across attribution windows
A platform claiming 7-day-click conversions will always post a higher ROAS than one on 1-day. Stacking those numbers side by side compares fiction to fact.
Using revenue, forgetting margin
Reporting a 3× ROAS as a win on a 20% margin hides a loss — break-even there is 5×. Always carry the margin alongside the ROAS.
Counting branded search as new revenue
Blended ROAS that leans on branded search and returning customers overstates what your ads actually drove. Look at incremental lift.
FAQ
Common questions
ROAS stands for return on ad spend — the revenue earned for every dollar spent on advertising. A ROAS of 4 (written 4×, 4:1, or 400%) means $4 of revenue came back for each $1 spent.
Divide the revenue attributed to a campaign by the amount spent on it: ROAS = revenue ÷ ad spend. $8,000 of sales from $2,000 of ads is a ROAS of 4 (4:1, or 400%).
A common rule of thumb is 4:1, but the real target depends on your profit margin. Break-even ROAS is 1 ÷ margin: on a 25% margin you need a ROAS of 4 just to cover the cost of goods, so anything below that loses money even though revenue exceeds ad spend. High-margin businesses can profit at 2× or lower.
Break-even ROAS is the return at which gross profit exactly covers your ad spend — found by inverting your profit margin: break-even = 1 ÷ margin. At a 50% margin it is 2×; at a 20% margin it is 5×. Beat it and the campaign profits; fall short and it loses money even at a ROAS above 1.
ROAS measures revenue against ad spend only. ROI (return on investment) measures profit against the total cost of the investment, including cost of goods, shipping, and overhead. A campaign can show a strong ROAS while ROI is negative if margins or other costs are thin.
They are inverses. ROAS = revenue ÷ spend, expressed as a multiple. ACOS (advertising cost of sales) = spend ÷ revenue, expressed as a percent. A 4× ROAS equals a 25% ACOS. Amazon sellers usually optimise ACOS; most other platforms report ROAS.
No. A ROAS of 1 (1:1) means revenue exactly equals ad spend, with nothing left to cover the product itself, fulfilment, or overhead — so you lose money. You are profitable only once your ROAS clears the break-even point set by your margin.
Start from break-even (1 ÷ margin), then build in the profit you want to keep. To retain a slice of revenue as profit, required ROAS = 1 ÷ (margin − target profit %). If you run on a 30% margin and want to keep 10% of revenue, you need 1 ÷ 20% = 5×.
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Ugo CharlesBuilt and fact-checked against our editorial standards · Last updated June 2026
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