API Quota Calculator
Check projected API usage against a quota and estimate overage cost.
About API Quota Calculator
Quotas and rate limits fail differently: quotas are breached by total volume while rate limits are breached by peaks. A service well inside its quota can still be throttled during a spike. Checking the peak against the rate limit is what catches the failure that monthly averages hide.
Formula
API Quota
Monthly requests = rate per minute × 43,200; peak = average × peak ratio
- rate limit
- Instantaneous cap, breached by peaks rather than averages
- quota
- Cumulative monthly cap
Worked example
With the default values below, API Quota Calculator returns Projected Monthly Requests of 34,560,000. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Average requests per minuteminimum 0
- 800
- Monthly quotaminimum 0.001
- 40,000,000
- Peak to average ratioaccepts 1–50 x
- 3 x
- Rate limit per minuteminimum 0.001
- 2,000
- Overage cost per thousand requestsminimum 0
- 0.4
Results
- Projected Monthly Requests
- 34,560,000
- Share of Quota Used
- 86.400%
- Peak Requests per Minute
- 2,400
- Estimated Overage Cost
- $0.00
- Verdict
- Peak traffic exceeds the per-minute rate limit — requests will be throttled
Step by step
- 1Values used
- 2API Quota
- 3Projected Monthly Requests= 34,560,000
- 4Share of Quota Used= 86.400
- 5Peak Requests per Minute= 2,400
- 6Estimated Overage Cost= 0.00
- 7Verdict= Peak traffic exceeds the per-minute rate limit — requests will be throttled
Assumptions and limits
- The result is derived only from the 5 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 3 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
How is API Quota calculated?
Monthly requests = rate per minute × 43,200; peak = average × peak ratio Quotas and rate limits fail differently: quotas are breached by total volume while rate limits are breached by peaks. A service well inside its quota can still be throttled during a spike.
Why does API Quota matter?
Checking the peak against the rate limit is what catches the failure that monthly averages hide.
What values do I need to enter?
This calculator takes 5 inputs: Average requests per minute, Monthly quota, Peak to average ratio, Rate limit per minute, Overage cost per thousand requests. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.