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# How to find out the real cost of an App Install – Deepak Abbot

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Finding the cost of your app install is simple — price (CPI) you pay to a network? Think again — is it the actual cost of each net install? Here is a quick math on how to calculate it accurately (excel calculator available below to download):

You need to have the following 3 basic numbers available to start with:
Price you pay per install: CPI paid to network
Average uninstall rate: Available from Android App Store dashboard
K Factor (How many organic install brought in by a paid one): Varies as per the rank bucket— check the table below.

K Factor Table:
Apps ranked between 1 to 10 = 2.5
Apps ranked between 11 to 25 = 1.5
Apps ranked between 26 to 50 = 1
Apps ranked between 51 to 100 = 0.5
Apps above 101 = 0.1
(Note: Rank in overall Free or Overall Paid section)

So now lets take an example and find App’s effective CPI:
Example 1: App ranked between 11 to 25
(A) Install Recd: 1
(B) CPI Charged by Network: \$2.5
(C) Total Paid to Network: A x B = \$2.5
(D) Uninstall Rate: 40%
(E) Net Installs: A/(1-D) = 0.6
(F) K Factor: 1.5 (Refer table above)
(G) Organic Install: E x F = 0.9
(H) Total Installs = E + G= 1.5
Effective CPI = C/H= \$1.67

So in above example your effective cost of getting an install is \$1.67

Now lets see how the math changes if your app is ranked below 100:
Example 2: App ranked below 100
(A) Install Recd: 1
(B) CPI Charged by Network: \$2.5
(C) Total Paid to Network: A x B = \$2.5
(D) Uninstall Rate: 40%
(E) Net Installs: A/(1-D) = 0.6
(F) K Factor: 0.1 (Refer table above)
(G) Organic Install: E x F = 0.06
(H) Total Installs = E + G = 0.66
Effective CPI = C/H = \$3.79