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Duration / Time Calculator

Convert between milliseconds, human-readable durations, ISO 8601 (P1DT2H30M), and HH:MM:SS formats. Calculate time breakdowns for timeouts, TTLs, and intervals.

Your data never leaves your browser Available via MCP

Enter a duration and click Convert

Accepts: milliseconds (90000), human (2h 30m 15s), ISO 8601 (P1DT2H30M), time (01:30:00)
Next steps
Epoch Converter → Date Converter → Cron Generator → Math Eval →

How to Use

  1. Enter a duration in any format: 90000 (ms), 2h 30m, P1DT2H30M, or 01:30:00.
  2. Click Convert to see all equivalent formats.
  3. Copy results with the Copy button.

Common Duration Values

  • 1 minute — 60,000 ms
  • 1 hour — 3,600,000 ms
  • 1 day — 86,400,000 ms
  • 1 week — 604,800,000 ms
  • 30 days — 2,592,000,000 ms

Developer Use Cases

  • Cache TTL — Redis EXPIRE, HTTP Cache-Control max-age
  • JWT expiration — token lifetime in seconds
  • Rate limiting — window size in milliseconds
  • Database timeouts — connection and query timeouts
  • Cron intervals — time between scheduled jobs

Related Tools

Convert Unix timestamps with the Epoch Converter. Convert date formats with the Date Converter. Build cron expressions with the Cron Generator. Evaluate math expressions with the Math Evaluator. Calculate byte sizes with the Byte Calculator.

Frequently Asked Questions

What input formats are supported?
Milliseconds (90000), human-readable (2h 30m 15s), ISO 8601 durations (P1DT2H30M), time notation (01:30:00), and simple units (30s, 5m, 2h, 1d, 1w).
What is ISO 8601 duration format?
ISO 8601 durations use the format PnYnMnDTnHnMnS. P is the duration designator, T separates date and time parts. Examples: P1D = 1 day, PT2H30M = 2 hours 30 minutes, P1DT12H = 1 day 12 hours.
How is this useful for developers?
Converting between duration formats is needed for configuring timeouts, TTLs, rate limits, cron intervals, cache expiration, JWT token lifetimes, and database connection pool settings.
Is my data safe?
Yes. All calculations happen entirely in your browser. No data is sent to any server.

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