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Ecommerce/Shopping · Buy-Side calculator

ACoS (Advertising Cost of Sale)

ACoS is ad spend as a percentage of the sales those ads drove, the standard metric on retail media like Amazon Ads.

Formula

ACoS = (Ad spend ÷ Attributed sales) × 100

Fill in any 2 fields. The one you edited longest ago is solved for you.

input
Dollars.
input
Dollars.
waiting
Percent. Waiting for the other fields.

Waiting for 2 values to solve ACoS.

What is ACoS?

ACoS is ad spend as a percentage of the sales those ads drove, the standard metric on retail media like Amazon Ads. It is the inverse of ROAS: a 20% ACoS is a 5x ROAS.

Worked example

If ad spend is $5,000 and attributed sales is $25,000, then ACoS = 20.00%.

ACoS = (Ad spend ÷ Attributed sales) × 100

Formula variable breakdown

spendAd spend
Enter ad spend directly, or leave it blank and let the solver calculate it from the other 2 fields.
salesAttributed sales
Enter attributed sales directly, or leave it blank and let the solver calculate it from the other 2 fields.
acosACoS(output)
Enter ACoS directly, or leave it blank and let the solver calculate it from the other 2 fields.

Tactical application guide

ACoS links ad spend and attributed sales in a fixed ratio, so any two pin down the third. Planning backwards is where it earns its keep: enter the ad spend you have and the ACoS you are targeting, and the solver tells you the attributed sales you must secure. Or lock attributed sales and ACoS from a benchmark to see the ad spend that plan implies before you commit.

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