Rate Limit Header Calculator
Fixed-window arithmetic from supplied values, with reset≤window and remaining=max(0,limit-used). Reference time is explicit. Legacy RateLimit-* and X-RateLimit-* are provider-specific conventions; X reset uses Unix seconds. Alternative syntax follows draft-ietf-httpapi-ratelimit-headers-11 (May2026), not a final RFC; confirm the receiver's contract. No live quota measurement.
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Results
Review the settings and run. Editing inputs clears old results.
Processing model and limits
Fixed-window arithmetic from supplied values, with reset≤window and remaining=max(0,limit-used). Reference time is explicit. Legacy RateLimit-* and X-RateLimit-* are provider-specific conventions; X reset uses Unix seconds. Alternative syntax follows draft-ietf-httpapi-ratelimit-headers-11 (May2026), not a final RFC; confirm the receiver's contract. No live quota measurement.
Data and model checked: IETF RateLimit draft11 ↗ToolHub source controls ↗
How to use this tool
Load the example, confirm field units and processing rules, then run locally. Editing any input clears the old result. Copy or download the complete output explicitly.
When not to use it
Fixed-window arithmetic from supplied values, with reset≤window and remaining=max(0,limit-used). Reference time is explicit. Legacy RateLimit-* and X-RateLimit-* are provider-specific conventions; X reset uses Unix seconds. Alternative syntax follows draft-ietf-httpapi-ratelimit-headers-11 (May2026), not a final RFC; confirm the receiver's contract. No live quota measurement.