Retry-After Header Calculator

Convert a Retry-After header in seconds or HTTP-date format into a local retry time and wait duration.

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This calculator is for API clients, crawlers and integrations that need to respect Retry-After after a 429 or 503 response. Paste the header value and optionally the response timestamp.

What it handles

The tool supports both Retry-After formats: delta seconds and HTTP dates. It returns the retry timestamp, ISO timestamp and wait duration in seconds and minutes.

Scope

Provider-specific backoff rules can be stricter than a single header. Use the result as a timing aid, not a replacement for API documentation.