Time Converter

Convert any time unit to another with this free time converter. It supports 9 units including seconds, milliseconds, microseconds, minutes, hours, days, and more. Pick a conversion below for a dedicated calculator, formula, and reference table. For example, 1 s = 1000 ms.

All time conversions

Second → Millisecond Second → Microsecond Second → Minute Second → Hour Second → Day Second → Week Second → Month Second → Year Millisecond → Second Millisecond → Microsecond Millisecond → Minute Millisecond → Hour Millisecond → Day Millisecond → Week Millisecond → Month Millisecond → Year Microsecond → Second Microsecond → Millisecond Microsecond → Minute Microsecond → Hour Microsecond → Day Microsecond → Week Microsecond → Month Microsecond → Year Minute → Second Minute → Millisecond Minute → Microsecond Minute → Hour Minute → Day Minute → Week Minute → Month Minute → Year Hour → Second Hour → Millisecond Hour → Microsecond Hour → Minute Hour → Day Hour → Week Hour → Month Hour → Year Day → Second Day → Millisecond Day → Microsecond Day → Minute Day → Hour Day → Week Day → Month Day → Year Week → Second Week → Millisecond Week → Microsecond Week → Minute Week → Hour Week → Day Week → Month Week → Year Month → Second Month → Millisecond Month → Microsecond Month → Minute Month → Hour Month → Day Month → Week Month → Year Year → Second Year → Millisecond Year → Microsecond Year → Minute Year → Hour Year → Day Year → Week Year → Month

About these units

Second (s)

Definition: The second (s) is the SI base unit of time, defined by the radiation frequency of the caesium-133 atom.
History: Once 1/86,400 of a day, it was redefined in 1967 using atomic transitions for far greater precision.
Current use: The second is the foundation of timekeeping in science, technology, and daily life.

Millisecond (ms)

Definition: A millisecond (ms) is one thousandth of a second.
History: It uses the SI prefix "milli-" and became important with electronics and computing.
Current use: Milliseconds measure response times, network latency, and reaction speed.

Microsecond (µs)

Definition: A microsecond (µs) is one millionth of a second.
History: It uses the SI prefix "micro-" (one millionth).
Current use: Microseconds measure fast electronic events and instruction timing.

Minute (min)

Definition: A minute (min) is a unit of time equal to 60 seconds.
History: It descends from the Babylonian base-60 system passed down through astronomy.
Current use: Minutes structure clocks, schedules, and everyday timekeeping worldwide.

Hour (h)

Definition: An hour (h) is a unit of time equal to 60 minutes, or 3,600 seconds.
History: Ancient Egyptians divided day and night into twelve parts each, giving the 24-hour day.
Current use: Hours organise work, travel, and daily life around the globe.

Day (d)

Definition: A day (d) is the time for one rotation of the Earth, taken as exactly 86,400 seconds.
History: The day is one of the oldest natural time units, tied to the cycle of sunlight.
Current use: Days are the basic unit of calendars and scheduling everywhere.

Week (wk)

Definition: A week (wk) is a period of seven days.
History: The seven-day week has ancient roots in Babylonian and Jewish tradition.
Current use: Weeks structure work, school, and planning across most cultures.

Month (mo)

Definition: A month (mo) is roughly one twelfth of a year, here taken as about 30.44 days on average.
History: Months originally tracked the cycles of the Moon, later regularised by solar calendars.
Current use: Months organise calendars, billing cycles, and long-term planning.

Year (yr)

Definition: A year (yr) is the time for the Earth to orbit the Sun, about 365.25 days.
History: Calendars from the Julian to the Gregorian refined the year to keep the seasons aligned.
Current use: Years are the standard unit for age, anniversaries, and long-term measurement.

Frequently asked questions

What time units can I convert?

This time converter supports 9 units: seconds, milliseconds, microseconds, minutes, hours, days, weeks, months, years. Select any pair below to open a dedicated converter with a formula and conversion table.

How accurate is the time converter?

Conversions use exact definitional factors, so results are accurate to the precision you need for science, engineering, and everyday use. Values are rounded only for display.

Is the time converter free?

Yes. Every time conversion is completely free, needs no sign-up, and runs entirely in your browser — your inputs never leave your device.

Free, private, and instant — every conversion runs in your browser.

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