Time Conversions

Time conversions are used in scheduling, project management, programming, physics, and medicine. While the second is the SI base unit, practical time uses minutes, hours, days, weeks, months, and years. High-precision contexts — computing, electronics, GPS — work in milliseconds, microseconds, and nanoseconds. Accurate time conversion is essential for calculating deadlines, billing, drug half-lives, and scientific measurements.

  • ✓Converting hours to minutes and seconds for timers and scheduling apps
  • ✓Converting days to weeks or months for project planning and billing
  • ✓Converting milliseconds to seconds for programming and latency benchmarks
  • ✓Converting years to days for age calculations and contract term planning

Most Popular Time Conversions

Hours → MinutesMinutes → HoursDays → HoursHours → SecondsMinutes → SecondsYears → Days

All Time Converters

Convert from Seconds (s)

Seconds → MillisecondsSeconds → MicrosecondsSeconds → NanosecondsSeconds → MinutesSeconds → HoursSeconds → DaysSeconds → WeeksSeconds → MonthsSeconds → Years

Convert from Milliseconds (ms)

Milliseconds → SecondsMilliseconds → MicrosecondsMilliseconds → NanosecondsMilliseconds → MinutesMilliseconds → HoursMilliseconds → DaysMilliseconds → WeeksMilliseconds → MonthsMilliseconds → Years

Convert from Microseconds (μs)

Microseconds → SecondsMicroseconds → MillisecondsMicroseconds → NanosecondsMicroseconds → MinutesMicroseconds → HoursMicroseconds → DaysMicroseconds → WeeksMicroseconds → MonthsMicroseconds → Years

Convert from Nanoseconds (ns)

Nanoseconds → SecondsNanoseconds → MillisecondsNanoseconds → MicrosecondsNanoseconds → MinutesNanoseconds → HoursNanoseconds → DaysNanoseconds → WeeksNanoseconds → MonthsNanoseconds → Years

Convert from Minutes (min)

Minutes → SecondsMinutes → MillisecondsMinutes → MicrosecondsMinutes → NanosecondsMinutes → HoursMinutes → DaysMinutes → WeeksMinutes → MonthsMinutes → Years

Convert from Hours (h)

Hours → SecondsHours → MillisecondsHours → MicrosecondsHours → NanosecondsHours → MinutesHours → DaysHours → WeeksHours → MonthsHours → Years

Convert from Days (d)

Days → SecondsDays → MillisecondsDays → MicrosecondsDays → NanosecondsDays → MinutesDays → HoursDays → WeeksDays → MonthsDays → Years

Convert from Weeks (wk)

Weeks → SecondsWeeks → MillisecondsWeeks → MicrosecondsWeeks → NanosecondsWeeks → MinutesWeeks → HoursWeeks → DaysWeeks → MonthsWeeks → Years

Convert from Months (mo)

Months → SecondsMonths → MillisecondsMonths → MicrosecondsMonths → NanosecondsMonths → MinutesMonths → HoursMonths → DaysMonths → WeeksMonths → Years

Convert from Years (yr)

Years → SecondsYears → MillisecondsYears → MicrosecondsYears → NanosecondsYears → MinutesYears → HoursYears → DaysYears → WeeksYears → Months

Frequently Asked Questions — Time

How many seconds are in a day?
There are 86,400 seconds in a day: 24 hours × 60 minutes × 60 seconds = 86,400 s.
How many days are in a year?
A common year has 365 days; a leap year has 366. The Gregorian calendar averages 365.2425 days per year when accounting for leap year rules. A Julian year used in astronomy is exactly 365.25 days.
How do you convert hours to minutes?
Multiply the number of hours by 60. For example, 2.5 hours = 150 minutes, and 0.75 hours = 45 minutes. To convert minutes back to hours, divide by 60.

Related Conversion Categories

Frequency Conversions

Convert between units of frequency for electronics, physics, and audio applications.

Speed Conversions

Convert between units of speed and velocity for travel, physics, and athletics.

Energy Conversions

Convert between units of energy for physics, nutrition, and electrical applications.

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