What is the Cost Per Install Calculator?
The Cost Per Install Calculator measures the average cost of acquiring a single app install through mobile advertising campaigns. CPI is the primary success metric for mobile user acquisition (UA) teams on iOS and Android. It helps app marketers evaluate ad network performance, optimize creative sets, and manage campaign budgets against install volume targets.
How does it work?
Enter your total campaign cost including ad platform spend, creative production, and any UA tool or agency fees. Enter the number of installs attributed to the campaign within your chosen attribution window. The calculator divides total cost by total installs to produce your average CPI. Lower CPI indicates more efficient install generation, though post-install engagement metrics also matter for true UA success.
Formula
campaign cost / installs
How the calculation works
How the calculation works
- 1Input campaign cost ($10,000) and installs (2,500).
- 2Divide cost by installs: $10,000 / 2,500 = $4.00.
- 3Result: $4.00 per install.
Worked example
Worked Example
Driftwave Travel, a travel-app startup, spends $10,000 on TikTok and Meta UA campaigns that generate 2,500 installs.
- 1Campaign cost: $10,000.
- 2Installs attributed: 2,500.
- 3Divide cost by installs: $10,000 / 2,500 = $4.00.
- 4CPI is $4.00 per install.
Result
Driftwave Travel acquired each install for $4.00.
Interpretation guide
How to read your result
Installs are expensive, often from premium geos, hard audiences, or high competition.
Test lower-cost geos, cheaper formats, and creative refresh before scaling.
Costs are normal for your app category.
Watch post-install metrics; CPI alone does not show if users retain or pay.
Efficient install generation, common in gaming and casual categories.
Scale the winning networks and creatives.
Very cheap installs; verify attribution quality to rule out organic leakage.
Check install-to-event rates before scaling budget.
Benchmarks
Typical CPI by app category. iOS CPIs typically run 30-60% higher than Android for the same campaign.
| App category | Typical | Strong |
|---|---|---|
| Gaming | $1-5 | <$1.50 |
| Productivity apps | $3-8 | <$3 |
| Fintech | $5-15 | <$5 |
Common mistakes
- - Not accounting for organic installs that get incorrectly attributed to paid campaigns
- - Comparing CPI across different geographies without adjusting for regional cost differences
- - Focusing solely on CPI without measuring post-install retention and in-app purchase value
Practical tips
Practical tips
Optimize for post-install events (registrations, first purchase), not raw installs.
Split iOS and Android budgets; iOS converts better but costs 30-60% more.
Use SKAdNetwork and your MMP to check attribution quality across networks.
Keep creative fresh; install costs climb quickly as audiences fatigue.
Cap CPI by geo and value segment to protect blended efficiency.
When should you use it?
- - Evaluating the efficiency of user acquisition campaigns across ad networks
- - Comparing CPI across different creative formats and audience segments
- - Setting target CPIs for campaign budget allocation and bid management
- - Reporting UA performance to product and executive stakeholders
Benefits
- - Provides a standardized cost metric for comparing UA channels and campaigns
- - Helps identify the most efficient ad networks and creative combinations for installs
- - Enables data-driven scaling decisions based on unit economics rather than install volume
Step-by-step example
Sum all costs associated with your UA campaign including ad network spend, video creative production, attribution tool costs, and any managed service fees. Count the installs attributed to the campaign from your MMP (Adjust, Branch, AppsFlyer). Divide total cost by total installs to find your CPI. Compare against your target CPI and industry benchmarks for your app category.
Real-world example
A mobile game runs a UA campaign spending $10,000 across TikTok and Meta, generating 2,500 installs. The CPI is $4.00. If the average player generates $6.00 in in-app purchases within 30 days, the campaign is profitable with a 1.5x short-term ROAS. A CPI above $8 would make it difficult to achieve positive returns given the average player value.