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Time Unit Converter

Convert durations between time units, from nanoseconds to years.

  • 0.001µs
  • 0.000001ms
  • 1e-9s
  • 1.66667e-11min
  • 2.77778e-13h
  • 1.15741e-14d
  • 1.65344e-15wk
  • 3.80257e-16mo
  • 3.16881e-17yr

How to use it

  1. Enter an amount Type the duration you want to convert.
  2. Choose the starting unit Select it in the "From" menu.
  3. Read the conversions All other units update instantly.

Examples

1 day 86,400 s
1 week 168 hours
1 hour 3,600 s

About this tool

This converter turns one duration unit into another — useful for timeouts, cooking, scheduling and quick mental math. It covers the full range from nanoseconds up to years.

Fixed-length units (seconds, minutes, hours, days, weeks) are exact. Because calendar months and years vary in length, those two use standard averages (a 365.25-day year). When you need the precise number of days between two specific calendar dates, use the date difference tool instead. Everything runs in your browser.

Frequently asked questions

How long is a "month" or "year" here?

They use averages — a year of 365.25 days and a month of one twelfth of that. For exact calendar gaps between two dates, use the date difference tool.

How many seconds are in a day?

86,400 seconds (24 × 60 × 60).

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Updated June 12, 2026