Time Unit Converter
Unit ConversionConvert any amount of time between 13 units at once: picoseconds, nanoseconds, microseconds, milliseconds, seconds, minutes, hours, days, weeks, fortnights, months, years and decades.
Hours
Seconds and Shorter
Minutes to Fortnights
Months and Longer
1 Hour = 3,600,000,000,000,000 Picoseconds ⟷ 1 Picosecond = 0.000000000000000277778 Hours
1 Hour = 3,600,000,000,000 Nanoseconds ⟷ 1 Nanosecond = 0.000000000000277778 Hours
1 Hour = 3,600,000,000 Microseconds ⟷ 1 Microsecond = 0.000000000277778 Hours
1 Hour = 3,600,000 Milliseconds ⟷ 1 Millisecond = 0.000000277778 Hours
1 Hour = 3,600 Seconds ⟷ 1 Second = 0.000277778 Hours
1 Hour = 60 Minutes ⟷ 1 Minute = 0.0166667 Hours
1 Hour = 0.0416667 Days ⟷ 1 Day = 24 Hours
1 Hour = 0.00595238 Weeks ⟷ 1 Week = 168 Hours
1 Hour = 0.00297619 Fortnights ⟷ 1 Fortnight = 336 Hours
1 Hour = 0.00136893 Months (average) ⟷ 1 Month (average) = 730.5 Hours
1 Hour = 0.000114077 Years (average) ⟷ 1 Year (average) = 8,766 Hours
1 Hour = 0.0000114077 Decades (average) ⟷ 1 Decade (average) = 87,660 Hours
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Unit Conversion calculators
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Unit Conversion calculators
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SponsoredThis time unit converter shows one amount of time in 13 units at once, from picoseconds to decades. Type a value into any box and every other box updates as you type, so it works between any two units of time, such as weeks to seconds or milliseconds to hours.
Every unit is defined from the second, the SI unit of time. Minutes, hours, days, weeks and fortnights are fixed multiples of it, so those results are complete. Months, years and decades vary in a real calendar, so they use the 365.25 day average year, the same average every converter on this site uses.
To convert an amount of time from one unit to another by hand, see the method and the time conversion chart below. This page converts durations; to find the time between two dates or two clock times, or to change time zones, use the tools linked below instead.
Units of Time
Each unit in the converter, from shortest to longest, in seconds. The minute, hour and day come from NIST SP 811; the shorter units are SI prefixes of the second.
| Unit | Symbol | Seconds | Value Status |
|---|---|---|---|
| Picosecond | ps | 0.000000000001 | Exact |
| Nanosecond | ns | 0.000000001 | Exact |
| Microsecond | µs | 0.000001 | Exact |
| Millisecond | ms | 0.001 | Exact |
| Second | s | 1 | Exact |
| Minute | min | 60 | Exact |
| Hour | h | 3,600 | Exact |
| Day | d | 86,400 | Exact |
| Week | wk | 604,800 | Exact |
| Fortnight | fortnight | 1,209,600 | Exact |
| Month | mo | 2,629,800 | Average |
| Year | yr | 31,557,600 | Average |
| Decade | decade | 315,576,000 | Average |
Month, year and decade use the 365.25 day average year, so 12 months are exactly 1 year and 10 years exactly 1 decade here.
What Is the SI Unit of Time
The second, symbol s, is the SI base unit of time, defined by the caesium 133 atom (BIPM). The minute, hour and day are not SI units but are accepted for use with them; the week, month and year are calendar units outside the SI.
What Is the Smallest Unit of Time
No official smallest unit of time exists. The SI prefixes reach down to the quectosecond, 10^-30 of a second, since the prefixes ronto and quecto were added in 2022 (BIPM). The Planck time, a constant from physics, is about 5.391247 × 10^-44 seconds (NIST, CODATA 2022), far shorter than anything a clock can measure.
The shortest unit in this converter is the picosecond, a trillionth of a second. Nanoseconds are a billionth of a second and microseconds a millionth.
Time Conversion Chart
One of each common unit in seconds, minutes, hours and days. Months and years are averages.
| Unit | Seconds | Minutes | Hours | Days |
|---|---|---|---|---|
| 1 minute | 60 seconds | 1 minute | 0.0166667 hours | 0.000694444 days |
| 1 hour | 3,600 seconds | 60 minutes | 1 hour | 0.0416667 days |
| 1 day | 86,400 seconds | 1,440 minutes | 24 hours | 1 day |
| 1 week | 604,800 seconds | 10,080 minutes | 168 hours | 7 days |
| 1 fortnight | 1,209,600 seconds | 20,160 minutes | 336 hours | 14 days |
| 1 month | 2,629,800 seconds | 43,830 minutes | 730.5 hours | 30.4375 days |
| 1 year | 31,557,600 seconds | 525,960 minutes | 8,766 hours | 365.25 days |
How to Convert Between Units of Time
- Multiply the amount by the number of seconds in its unit, from the Units of Time table.
- Divide by the number of seconds in the unit you want.
- Example: 3 weeks × 604,800 = 1,814,400 seconds, and 1,814,400 ÷ 60 = 30,240 minutes.
Every unit here is defined from the second, so any pair converts in two steps: multiply by the first unit's seconds, then divide by the second unit's.
Time Zones and Dates Are Different Tools
Many searches for a time converter are about clocks rather than amounts of time. To change 3 PM in New York into London time, use the Time Zone Converter. To find the time between two dates, use the Time Between Dates Calculator, and to add or subtract times such as 1:45 plus 2:30, use the Time Calculator.
Single Time Conversions
Single conversions between two units of time, one page per pair of units.
Seconds and Milliseconds
- Seconds to Hours Converter: 1 hour = 3,600 seconds
- Minutes to Seconds Converter: 1 minute = 60 seconds
- Seconds to Days Converter: 1 day = 86,400 seconds
- Seconds to Years Converter: 1 year is 31,557,600 seconds on average
- Milliseconds to Seconds Converter: 1 second = 1,000 milliseconds
Minutes and Hours
- Hours to Days Converter: 1 day = 24 hours
- Minutes to Hours Converter: 1 hour = 60 minutes
- Hours to Weeks Converter: 1 week = 168 hours
- Hours to Years Converter: 1 year is 8,766 hours on average
- Days to Minutes Converter: 1 day = 1,440 minutes
- Minutes to Years Converter: 1 year is 525,960 minutes on average
Days and Weeks
- Days to Months Converter: 1 month is 30.4375 days on average
- Days to Weeks Converter: 1 week = 7 days
- Days to Years Converter: 1 year is 365.25 days on average
- Months to Weeks Converter: 1 month is about 4.348214 weeks on average
- Weeks to Years Converter: 1 year is about 52.178571 weeks on average
Months, Years and Decades
- Months to Years Converter: 1 year = 12 months
- Decades to Years Converter: 1 decade = 10 years
Other Time Converters
Each converter below shows one amount of time in many units at once, starting from a different unit.
- Day Converter: days to hours, minutes, weeks, fortnights, months and years at once
- Hour Converter: hours to minutes, seconds, days, weeks, months and years at once
- Minute Converter: minutes to hours, seconds, days, weeks and more at once
- Seconds Converter: seconds to milliseconds, nanoseconds, minutes, hours and more at once
- Milliseconds Converter: milliseconds to seconds, minutes, microseconds and more at once
Frequently Asked Questions
How many seconds are in a decade?
315,576,000 seconds in an average decade of 3,652.5 days, ten 365.25 day years.
How many minutes are in 3 days?
4,320 minutes, since each day has 1,440 minutes.
How many days is 10,000 hours?
About 416.6667 days, which is 416 days and 16 hours.
Is a month 4 weeks?
Only February in a common year. The average month here is 30.4375 days, about 4.348 weeks, and calendar months run from 28 to 31 days.
How many minutes is 2.5 hours?
150 minutes: 2 hours is 120 minutes and half an hour is 30 more.
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