CPI varies hugely: casual gaming $0.50–$1, e-commerce $1–$3, fintech $3–$10, subscription apps $2–$8. iOS is typically 2–3x more expensive than Android. The "good" CPI depends on your LTV — as long as CPI < LTV, acquisition is profitable.

Why is effective CPI more important than raw CPI?

Raw CPI only measures the download cost. Many installs never result in engaged users. Effective CPI accounts for what percentage of installs actually use and retain the app, giving the true cost of acquiring a valuable user.

How do I improve my activation rate?

Optimize your onboarding flow: reduce steps, add progress indicators, show value immediately. Ensure your ad creative accurately represents the app. Send push notifications reminding users to complete setup. A/B test onboarding variations.

What activation and retention rates are typical?

Average app activation (completes onboarding): 40–70%. Day-1 retention: 25–40%. Day-7 retention: 10–20%. Day-30 retention: 5–15%. Social and gaming apps tend toward lower retention; utility and fintech toward higher.

Should I optimize for CPI or cost per event?

Optimize for cost per in-app event (registration, purchase, subscription) once you have enough data. Facebook, Google, and TikTok all support "app event optimization" that targets users more likely to become retained users, improving effective CPI.

How does CPI differ between iOS and Android?

iOS CPI is typically 2–3x higher than Android due to smaller audience and Apple's privacy controls (ATT). However, iOS users tend to have higher LTV, better retention, and higher purchase rates, often justifying the higher CPI.

App Install Cost Calculator

Calculate your cost per install (CPI) for mobile app campaigns. Measure effective CPI including post-install activation and retention for true user acquisition cost.

Ad Spend ($)

Platform

Campaign Type

Impressions

Clicks

App Installs

Acquisition Funnel

Impressions1,200,000

Clicks28,000

Installs4,000

Active Users (30d)1,280

Cost per Install (CPI)

$2.00

Primary metric for app install campaign efficiency

Cost per Click (CPC)

$0.29

Ad spend divided by total clicks

CPM (Cost per 1,000 Impr.)

$6.67

Effective CPM across the campaign

Install Rate

14.29%

Click-to-install: 0.333% impression-to-install

Active Users (30-day)

1,280

Estimated D30 retention for android platform

Cost per Active User

$6.25

True acquisition cost after accounting for churn

Platform CPI Benchmarks

Platform / Vertical	CPI Range	CTR	Install Rate	Notes
iOS – Gaming	$1.50–$4.00	2–4%	5–10%	High competition, premium users
iOS – Utility	$0.80–$2.50	3–5%	8–15%	Strong retention potential
iOS – Finance	$3.00–$8.00	1–3%	3–7%	Highest CPIs in market
Android – Gaming	$0.60–$2.00	3–6%	8–14%	Broader reach, lower CPIs
Android – Utility	$0.30–$1.50	4–7%	10–18%	Most cost-efficient
Android – Finance	$1.50–$5.00	2–4%	5–10%	Growing market

Planning notes, formulas, and examples

About the App Install Cost Calculator

Cost per install (CPI) is the primary metric for mobile app advertising campaigns. Every major platform — Facebook, Google, TikTok, Apple Search Ads — can deliver app installs, but the cost and quality vary dramatically.

However, raw CPI tells only part of the story. Many installs come from users who never open the app, or open it once and churn. The effective CPI accounting for activation rate (users who complete onboarding) and retention rate (users who remain after 7 or 30 days) reveals the true acquisition cost per valuable user.

This calculator computes both the raw CPI and the effective CPI adjusted for post-install behavior. It helps you compare campaigns on the metric that matters: cost per retained, activated user, not just cost per download.

Quantifying this parameter enables systematic comparison across campaigns, channels, and time periods, revealing opportunities for optimization that drive sustainable business growth. This analytical approach empowers marketing teams to run more efficient campaigns, reduce wasted ad spend, and continuously improve the customer acquisition funnel over time.

When This Page Helps

Raw CPI doesn't reflect user quality. This calculator adjusts for activation and retention to show the true cost per valuable user, helping you optimize mobile user acquisition budgets across platforms.

How to Use the Inputs

Enter your total ad spend for app install campaigns.
Enter the total number of installs.
Enter your activation rate (% who complete onboarding).
Enter your 7-day or 30-day retention rate.
View your raw CPI, effective CPI, and cost per retained user.
Compare across campaigns and platforms to allocate budget.

Formula used

CPI = Ad Spend ÷ Installs
Activated Users = Installs × Activation Rate
Retained Users = Activated Users × Retention Rate
Cost Per Activated User = Spend ÷ Activated Users
Cost Per Retained User = Spend ÷ Retained Users

Example Calculation

Result: $2.00 CPI, $13.33 cost per retained user

$10,000 ÷ 5,000 installs = $2.00 CPI. With 60% activation, 3,000 users actually use the app ($3.33 each). With 25% 30-day retention, only 750 users remain ($13.33 each). The true cost per valuable user is 6.7x the headline CPI.

Tips & Best Practices

Global average CPI ranges from $1–$5 for iOS and $0.50–$3 for Android.
Gaming apps typically have the lowest CPI but also the lowest retention.
Apple Search Ads have high CPI ($2–$5) but strong intent and better retention.
Facebook and TikTok often have lower CPI but variable quality — track down-funnel metrics.
Optimize for post-install events (activation, purchase) not just installs.
Run cohort analysis on D1, D7, D30 retention to compare campaign quality.

The True Cost of App User Acquisition

App install advertising is one of the largest categories of digital ad spend, but the headline CPI metric hides significant quality variation. Two campaigns with identical $2 CPI can have vastly different outcomes if one has 60% activation and the other has 30%.

The Install-to-Activation Gap

On average, 30–50% of app installs never result in a meaningful app open. Users install and forget, or open once and never return. This gap between install and activation is the biggest hidden cost in mobile marketing. Improving activation rate compounds the value of every dollar spent on acquisition.

Platform CPI Comparison

Facebook app install campaigns: $1–$3 CPI. Google UAC: $1–$4. Apple Search Ads: $2–$5. TikTok: $0.50–$2. Snapchat: $1–$3. Each platform attracts different user quality. Lower CPI platforms may not deliver lower cost-per-retained-user.

Building a CPI Target

Your target CPI should be derived from LTV: if average user lifetime value is $20 and you want a 3x LTV:CPI ratio, your target CPI is $6.67. But use effective CPI (adjusted for activation and retention) in this calculation for accuracy.

Sources & Methodology

Last updated: February 8, 2026

Frequently Asked Questions

CPI varies hugely: casual gaming $0.50–$1, e-commerce $1–$3, fintech $3–$10, subscription apps $2–$8. iOS is typically 2–3x more expensive than Android. The "good" CPI depends on your LTV — as long as CPI < LTV, acquisition is profitable.