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ACOS calculator

Enter ad spend and ad-attributed sales to get your ACOS and see if it beats your margin.

Inputs

Results update live as you type.

ACOS
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Enter values to calculate.

As ROAS
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Ad profit
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Formulas: ACOS = ad spend / ad sales x 100. It is the inverse of ROAS. Profitable when below your product margin.
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ACOS vs ROAS

ACOS is the inverse of ROAS: a 20% ACOS equals a 5.0x ROAS (100 / 20 = 5). Amazon sellers quote ACOS because the ad console reports it that way; the math is identical, only the direction differs.

The only benchmark that matters

Your break-even ACOS equals your product margin before ads. With a 30% margin, any ACOS under 30% keeps the sale profitable. Chasing a low ACOS for its own sake can starve campaigns that would still make money.

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ACOS Calculator FAQs

How do you calculate ACOS?
Divide ad spend by ad-attributed sales and multiply by 100. $300 spend on $1,500 sales is a 20% ACOS.
What is a good ACOS on Amazon?
One that sits below your product margin. Many sellers target 15 to 30%, but a 40% ACOS is fine on a 60% margin product and terrible on a 25% margin one.
How do you convert ACOS to ROAS?
ROAS = 100 / ACOS. A 25% ACOS equals a 4.0x ROAS. To go the other way, ACOS = 100 / ROAS.
Why is my ACOS over 100%?
Ad spend exceeded the sales it generated, often during launches or ranking pushes. It can be deliberate for keyword ranking, but it is not sustainable as an everyday target.
Is my data uploaded anywhere?
No. Every calculation happens in your browser with JavaScript. Nothing you enter leaves your device.
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