Time Converter — Convert All Time Units Online

Second

The second (s) is the SI base unit of time. Originally defined as 1/86,400 of a day, it is now defined by the vibration frequency of caesium-133 atoms. The second is the foundation for all other time measurements.

1 s to ms 1 s to min 1 s to h 1 s to d 1 s to wk 1 s to mo 1 s to yr

Millisecond

The millisecond (ms) is one thousandth of a second. It is used in computing for measuring response times, in sports for timing events, and in science for recording brief intervals. Human reaction time is typically 200-300 milliseconds.

1 ms to s 1 ms to min 1 ms to h 1 ms to d 1 ms to wk 1 ms to mo 1 ms to yr

Minute

The minute (min) equals 60 seconds. It is one of the most commonly used time units in everyday life for scheduling, cooking, exercise, and transportation. The concept dates back to ancient Babylonian base-60 mathematics.

1 min to s 1 min to ms 1 min to h 1 min to d 1 min to wk 1 min to mo 1 min to yr

Hour

The hour (h) equals 60 minutes or 3,600 seconds. It is a fundamental unit for organizing daily schedules, work hours, travel times, and time zones. A standard day has 24 hours.

1 h to s 1 h to ms 1 h to min 1 h to d 1 h to wk 1 h to mo 1 h to yr

Day

The day (d) equals 24 hours or 86,400 seconds. It is based on one complete rotation of the Earth on its axis. Days are the basic unit for calendars, scheduling, and measuring durations of events.

1 d to s 1 d to ms 1 d to min 1 d to h 1 d to wk 1 d to mo 1 d to yr

Week

The week (wk) equals 7 days. The seven-day week has been used continuously for thousands of years and is the standard cycle for work schedules, school timetables, and recurring events.

1 wk to s 1 wk to ms 1 wk to min 1 wk to h 1 wk to d 1 wk to mo 1 wk to yr

Month

The month (mo) is a calendar unit that varies from 28 to 31 days. For conversion purposes, an average month of 30.4375 days (365.25/12) is used. Months are fundamental to financial planning, billing cycles, and age calculations.

1 mo to s 1 mo to ms 1 mo to min 1 mo to h 1 mo to d 1 mo to wk 1 mo to yr

Year

The year (yr) is the time Earth takes to orbit the Sun, approximately 365.25 days (accounting for leap years). Years are used for measuring age, historical dates, financial periods, and long-term planning.

1 yr to s 1 yr to ms 1 yr to min 1 yr to h 1 yr to d 1 yr to wk 1 yr to mo

What Is Time?

Time is a fundamental physical quantity that measures the duration of events and the intervals between them. It is one of the seven SI base quantities. Time measurement has evolved from sundials and water clocks to atomic clocks that lose less than one second in millions of years.

Small Units

The second (s) is the SI base unit of time, defined by the frequency of radiation from caesium-133 atoms. The millisecond (ms), one thousandth of a second, is used in computing for response times, in sports timing, and in science. Human reaction time is typically 200–300 milliseconds.

Everyday Units

The minute (min) equals 60 seconds and the hour (h) equals 60 minutes or 3,600 seconds — both originate from ancient Babylonian base-60 mathematics. The day (d) equals 24 hours and is based on one rotation of the Earth. The week (wk) equals 7 days and has been used for thousands of years as a standard cycle for work and rest.

Calendar Units

The month (mo) varies from 28 to 31 days in the Gregorian calendar. For conversion purposes, the average month is 30.4375 days (365.25 ÷ 12). The year (yr) is the time Earth takes to orbit the Sun — approximately 365.25 days including leap year adjustments. A tropical year is 365.2422 days, while the Julian year used in astronomy is exactly 365.25 days.

Practical Applications

Time conversions are needed in project management (weeks to days), cooking (minutes and seconds), computing (milliseconds), travel planning (hours and days), financial calculations (months and years), and science (seconds and milliseconds for precise measurements).