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App/Mobile · Buy-Side calculator

CPI (Cost per Install)

CPI is the average cost of each app install driven by your ads.

Formula

CPI = Spend ÷ Installs

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

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

Waiting for 2 values to solve CPI.

What is CPI?

CPI is the average cost of each app install driven by your ads. It is the entry price of mobile growth, but the installs only pay off if users stick around and spend.

Worked example

If spend is $15,000 and installs is 6,000, then CPI = $2.50.

CPI = Spend ÷ Installs

Formula variable breakdown

spendSpend
Enter spend directly, or leave it blank and let the solver calculate it from the other 2 fields.
installsInstalls
Enter installs directly, or leave it blank and let the solver calculate it from the other 2 fields.
cpiCPI(output)
Enter CPI directly, or leave it blank and let the solver calculate it from the other 2 fields.

Tactical application guide

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

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