Technology & Computing
API Rate Limiter Token Bucket & Leaky Bucket Sizer
Size a token bucket or leaky bucket rate limiter to sustain an average request rate while tolerating bursts.
Your inputs
Change any value to update the result instantly.
Requests admitted immediately
500 requests
Requests queued/throttled
300 requests
Time to drain remaining burst
3 sec
Time to fully serve the burst
8 sec
Increase bucket capacity to tolerate larger bursts without rejecting requests; increase refill rate to raise the sustained long-run throughput.
Formula and working
Bucket fills at refillRate tokens/sec, up to bucketCapacity; a burst of size B drains the bucket in B ÷ refillRate seconds if B > capacity is disallowed
- 1
Collect the inputs
Sustained allowed rate (requests/sec) = 100; Bucket capacity (max burst size, tokens) = 500; Incoming burst size (requests) = 800
- 2
Apply the formula
Bucket fills at refillRate tokens/sec, up to bucketCapacity; a burst of size B drains the bucket in B ÷ refillRate seconds if B > capacity is disallowed
- 3
Result
Requests admitted immediately = 500 requests
Frequently asked questions
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
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