API Budget & Quota Calculator
Turn a monthly API budget into token, request, and per-user usage quotas with an operating reserve.
Editable usage, rate, and operating assumptions
Scenario totals and unit economics
Set per-user token quotas
API Budget & Quota Calculator
Convert a fixed monthly budget into safe token, request, and per-user limits.
Frequently asked questions
Practical answers for applying this calculator to a production API billing or usage plan.
Why reserve part of an API budget?
A reserve covers retries, traffic spikes, larger prompts, price changes, and usage that arrives before metering or alerts catch up.
Should quotas use registered or active users?
Use expected active users for realistic allocation, then enforce hard account or workspace caps so unexpected activation cannot exceed the total budget.
How often should an API budget be reviewed?
Review after model, pricing, product, or traffic changes and compare forecast with actual spend at least once per billing cycle.
Related API billing guides
Read the concepts behind the calculator and adapt the examples to your own API pricing model.
How to Price an API: Cost, Margin and Billing Models
Follow a step-by-step method to choose a billable unit, calculate delivery cost, set margin, design free tiers, and publish sustainable paid API plans.
Read guideAPI Fees & Charges Explained: Rates and Invoice Examples
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