How it works
Channel CPI = spend ÷ attributed installs. Combined CPI = total spend ÷ total installs.
Acquisition and ads
Cost per install calculator
Compare cost per install across two channels using spend and attributed installs from the same window.
- Channel A CPI
- $2.00
- Channel B CPI
- $3.00
- Combined CPI
- $2.33
Lower CPI does not imply cheaper payers. Deduplicate installs and also compare retention and paid conversion.
Worked example
Channel A: 2,000/1,000 = 2 per install. Channel B: 1,500/500 = 3. Combined CPI: 2.33.
Assumptions and limits
Lower CPI does not imply cheaper payers. Deduplicate installs and also compare retention and paid conversion.
Frequently asked questions
How do I use the cost per install calculator?
Compare cost per install across two channels using spend and attributed installs from the same window.
Should I count reinstalls?
Use a rule consistent with your measurement platform. Mixing first installs and reinstalls undermines comparison.
Do I need an account and are my inputs uploaded?
No account is required. Calculations run in your browser. Entered numbers and text are not included in tool analytics events; only the tool ID, language, and action are recorded.
Want to go past the numbers and see the real market?
Noctral shows estimated MRR, live ads, creators, and competitors so you can validate opportunities with real signals instead of projections.
See Noctral data
