Unit Converters

Time Unit Converter

Convert any duration between milliseconds, seconds, minutes, hours, days, weeks, months, and years — all updating simultaneously. Perfect for SLAs, timeouts, subscription periods, and project planning.

All units update live as you type No sign-up required Browser-only — works offline

Time

Type in any field — all other units update instantly

Features

  • Milliseconds, seconds, minutes, hours, days, weeks, months, years
  • All units update live simultaneously
  • Handles fractions (e.g. 1.5 years)
  • Shows exact and approximate conversions
  • Month uses average 30.437 days for approximation
  • Browser-only, no account needed

How to use it

  1. Select a time unit from the dropdown.
  2. Type your duration value.
  3. All other time units update instantly.
  4. Click any result field to set it as the new input.

Use cases

  • Converting API timeout values from ms to seconds
  • Calculating uptime SLA minutes from percentage
  • Project timeline planning (weeks to months)
  • Subscription period conversion (days to years)

Limitations

  • Browser processing depends on available device memory for very large inputs.
  • Tool-specific limits based on file format or browser support are noted on each tool page.
See also

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Questions & answers

Frequently asked

How many seconds in a year?

Approximately 31,557,600 seconds (365.25 days × 24 h × 3600 s), accounting for leap years.

Are month values exact?

Months use an average of 30.4375 days (365.25 ÷ 12). For exact calendar-based conversions use the Date Calculator.