⏱️ Time Converter

Time Unit Converter
( ms, s, min, h, d, yr & more )

Convert between milliseconds, seconds, minutes, hours, days, weeks, months, years, decades, centuries and more. Enter any value, get instant results.

Converter Tool
s
ms
From
    To
      Result
      1 s = 1000 ms
      1000
      ms
      The Formula
      ms = s × 1000
      1 second = 1000 milliseconds exactly
      60 s= 1 min
      60 min= 1 h
      24 h= 1 d
      365 d≈ 1 yr
      Unit Reference Table

      All time units relative to 1 second (s). Year = 365 days.

      Unit NameSymbolValue in SecondsCommon Usage

      Understanding Time Measurement Units

      Time is a fundamental dimension. The SI base unit is the second (s). From it, we derive larger units: minutes, hours, days, and years. The relationships are well‑known, but some (like months and years) have variations (leap years, month lengths).

      Standard Conversions

      1 minute = 60 s, 1 hour = 60 min = 3600 s, 1 day = 24 h = 86,400 s, 1 week = 7 d = 604,800 s. For longer periods: 1 common year = 365 d = 31,536,000 s, 1 decade = 10 yr, 1 century = 100 yr, 1 millennium = 1000 yr. Months vary, but a typical month is 1/12 year ≈ 30.44 days.

      Leap Years & Calendar Nuances

      The Gregorian calendar adds a leap day every 4 years (except centuries not divisible by 400). This tool uses a common year of 365 days for simplicity. For precise historical or astronomical calculations, specialized calendars should be used.

      Where These Units Are Used

      • Milliseconds (ms) – computer processing, reaction times
      • Seconds (s) – everyday timing, science
      • Minutes (min) / Hours (h) – scheduling, travel
      • Days (d) / Weeks (wk) – planning, work cycles
      • Months (mo) / Years (yr) – age, finance, history
      • Decades / Centuries – historical periods, long‑term trends
      Frequently Asked Questions
      How many seconds are in an hour? +
      1 hour = 60 minutes × 60 seconds = 3,600 seconds exactly.
      How do you convert days to hours? +
      Multiply days by 24. Example: 3 days × 24 = 72 hours.
      What is 1 year in days? +
      1 common year = 365 days. A leap year has 366 days. This tool uses 365 days for general conversions.
      How many weeks in a century? +
      Based on a common year, 1 century = 100 years × 365 days ÷ 7 ≈ 5,214.2857 weeks.
      How many milliseconds in a minute? +
      1 minute = 60 seconds × 1000 ms = 60,000 ms.
      What is a leap year? +
      A leap year has 366 days, adding February 29. It occurs every 4 years (except centuries not divisible by 400).
      All Time Conversion Pages

      Browse all 90 dedicated conversion pages, organized by unit.

      ✓ Copied to clipboard!