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Converters

Time Unit Converter

Convert between milliseconds, seconds, minutes, hours, days, weeks, and years — with exact multiples and decimal breakdowns.

Milliseconds (ms)1
Seconds (s)0.001
Minutes (min)0.000017
Hours (h)0
Days (d)0
Weeks (wk)0
Months (avg 30.44 d)0
Years (Julian 365.25 d)0

Anchored conversions from Milliseconds (ms) use exact internationally agreed factors. Everything is computed locally, instantly.

Units That Are Not Round

Most time units scale cleanly, but the calendar ones do not: a month averages 30.44 days (365.2425 ÷ 12) and a year is 365.2425 days, not 365 — the converter uses the Gregorian mean so that 1,000,000 seconds is a consistent 11.57 days regardless of which months it spans.

This matters for SLAs and uptime math: "99.9% uptime" leaves 43.8 minutes per 30-day month, and the monthly figure shifts by a few minutes depending on the month length you assume. Convert durations, not wall-clock dates, with this tool.

How the Conversion Works

  1. Enter a duration in any unit.
  2. All other units convert at once, anchored on the second.
  3. Months use a 30.44-day average; the exact day count assumption is stated so results are never misleading.
  4. Copy the full breakdown for reports or estimates.
Formula & Technical Standard
Anchored on seconds: 1 h = 3600 s, 1 d = 86,400 s, 1 yr = 365.25 d (Julian year). Months average 30.44 d.

Conversion Example

Work hours to days
Input: 120 hours
Output: 5 days · 7,200 minutes
Project estimates frequently need hours-to-days translation against an 8-hour or 24-hour day.
Uptime in months
Input: 10,000,000 seconds
Output: 115.7 days · 3.8 months
Server uptime stats in seconds become readable when converted to larger units.

Common Questions

Why is a month 30.44 days here?

Calendar months range from 28 to 31 days, so converters use the average (365.25/12). For calendar-exact arithmetic use the date tools instead.

Which year length is used?

The Julian year of 365.25 days, the standard in astronomy and the basis of the light-year.

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Convert between all common metric and imperial length units with exact, internationally agreed conversion factors — every unit shown at once.