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ACOS Calculator

Work out your ACOS (advertising cost of sales), the equivalent ROAS, and whether you’re above or below your break-even ACOS.

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Your margin = your break-even ACOS.
ACOS
Equivalent ROAS
Break-even ACOS

ACOS explained

ACOS = Ad spend ÷ Sales × 100. It’s the inverse of ROAS (ACOS 25% = ROAS 4.0). Common on Amazon and Shopping. Your break-even ACOS equals your profit margin.

Reading the number

If your margin is 30%, any ACOS under 30% is profitable. Lower isn’t always better if a higher ACOS is still profitable and drives volume.

Frequently asked questions

How do I calculate ACOS?

Divide ad spend by the sales those ads generated and multiply by 100.

What is a good ACOS?

Anything below your profit margin. Margin 30% → keep ACOS under 30% to profit.

Is this free?

Yes — no sign-up.

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