Cost per User Calculator
Calculate the average AI infrastructure cost incurred per active user.
About Cost per User Calculator
Cost per user is a core unit-economics metric for AI products: it divides total monthly cost — infrastructure plus third-party API spend — by the number of active users to determine how much each user costs to serve. Comparing this figure against your revenue per user (e.g. subscription price) tells you whether your AI feature is profitable at scale.
Formula
cost_per_user = (infrastructure_cost + api_costs) / active_users
- infrastructure_cost
- Monthly infrastructure spend
- api_costs
- Monthly third-party API spend
- active_users
- Number of active users in the period
Worked example
With the default values below, Cost per User Calculator returns Cost per User of $2.0000. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Infrastructure Cost / Monthaccepts 0–100,000,000 $
- 4,000 $
- API Costs / Monthaccepts 0–100,000,000 $
- 6,000 $
- Active Usersaccepts 1–1,000,000,000 users
- 5,000 users
Results
- Cost per User
- $2.0000
- Total Monthly Cost
- $10,000.00
Step by step
- 1Total monthly cost= $10000.00
- 2Cost per user= $2.0000
Assumptions and limits
- The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax or compounding frequency into account.
- Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
What counts as an 'active user' here?
Define active users consistently with your product's usage metrics (e.g. monthly active users) so the cost figure aligns with your revenue-per-user calculations.
Should support and engineering salaries be included?
This calculator focuses on infrastructure and API costs; you can fold labor costs into the infrastructure cost input if you want an all-in figure.
How can I reduce cost per user?
Common levers include caching repeated responses, using smaller/cheaper models for simple requests, batching API calls, and negotiating volume discounts with providers.