Your monthly AI bill divided by active users.
Revenue per user is meaningless if AI cost per user is chasing it. This ratio is the health check. Price with margin on the AI SaaS margin calculator.
Free AI cost-per-active-user calculator — monthly AI spend and active users to your per-user cost and unit economics.
Monthly AI spend ÷ monthly active users. It's the core unit-economics metric for an AI product — it tells you whether each user is profitable once AI cost is counted.
Because AI usage grows as users engage more. A metric that looks fine at launch can quietly rise until AI cost approaches your price. Watching it monthly catches the trend early.