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Cost Per Install Calculator

Enter your ad spend and target cost per install, or flip it around with an install goal, and get an instant CPI along with the budget or install volume it implies.

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Cost per install (CPI)
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A cost per install calculator turns your app install ad spend and results into a single CPI figure, or works backward from an install goal to tell you the budget needed to reach it.

CPI is not the same as CAC

Cost per install only measures what it costs to get someone to tap install, not what it costs to acquire a customer who actually pays or sticks around. An app can post an impressively low CPI while still losing money if most of those installs never open the app again, which is why CPI needs to be tracked alongside retention and lifetime value rather than as a standalone success metric.

Why CPI benchmarks vary so widely

Mobile measurement partners such as AppsFlyer and industry publications like Business of Apps regularly publish CPI benchmark data showing enormous variation by app category, platform and country, from well under a dollar for some casual games to several dollars or more for finance and subscription apps. The right CPI target depends on what a converted user is actually worth to your business, not a number pulled from an unrelated category.

What actually moves CPI over time

Creative fatigue hits app install campaigns faster than most other ad formats, so refreshing ad creative regularly tends to be the single biggest lever advertisers have over CPI. Building lookalike audiences from users who retained and converted well, and pulling spend away from placements with weak post-install behavior, are the next levers, ahead of simply cutting bids and accepting lower volume. The same discipline of tying spend to real downstream value is what Rankite applies across every organic and paid growth channel.

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FAQ

Cost Per Install Calculator: questions, answered

What is cost per install (CPI)?
Cost per install is the average amount spent on app install advertising to generate one install, calculated as total ad spend divided by the number of installs it produced. It is the mobile app equivalent of cost per click or cost per lead, and it is one of the most closely watched metrics in app user acquisition.
How do you calculate cost per install?
Divide total ad spend by the number of installs generated over the same period. If a campaign spends $5,000 and generates 2,000 installs, the cost per install is $5,000 divided by 2,000, which is $2.50.
What is a good cost per install?
CPI varies enormously by app category, platform and country, with benchmark data from mobile measurement partners like AppsFlyer and Business of Apps showing gaming and utility apps often paying well under a dollar per install in some markets, while finance and subscription apps with higher lifetime value can profitably pay several dollars or more. Compare your CPI against your own target based on lifetime value, not a single universal number.
Is a lower cost per install always better?
Not by itself. A campaign can produce a very low CPI by targeting broadly and attracting installs from users unlikely to ever pay or stick around, which looks efficient on this one metric while quietly hurting retention and revenue per install. CPI needs to be read alongside retention and lifetime value, not in isolation.
How does cost per install relate to customer acquisition cost (CAC)?
CPI measures the cost to get someone to install the app, while CAC typically measures the cost to acquire a paying or otherwise valuable customer, which requires the install to also convert further down the funnel. An app with a very low CPI but poor onboarding can still end up with a high CAC once you account for how few installs ever turn into real customers.
What lowers cost per install over time?
Creative testing tends to move CPI the most in mobile user acquisition, since ad creative fatigues faster on app install campaigns than on many other ad formats. Expanding into lookalike audiences built from your best existing users, and cutting spend on placements or networks with weak post-install retention, are the next most common levers advertisers use to bring CPI down without just cutting volume.

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