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About the Time Unit Converter
The time unit converter changes one amount of time into twelve different units at the same time. Enter a number, choose its unit, and the result lists the same amount in every other unit.
The supported units are nanoseconds, microseconds, milliseconds, seconds, minutes, hours, days, weeks, months, years, decades and centuries. Months and years use Gregorian calendar averages, because their real length varies. The headline result also shows the value in seconds, the base unit of time.
How to Use the Time Unit Converter
- Enter the value you want to convert.
- Choose its unit from the list.
- Read the same value in every other unit in the result panel.
Time Unit Conversion Table
| Unit | Equals |
|---|---|
| 1 millisecond | 0.001 seconds |
| 1 second | 1,000 milliseconds |
| 1 minute | 60 seconds |
| 1 hour | 60 minutes, or 3,600 seconds |
| 1 day | 24 hours, or 1,440 minutes, or 86,400 seconds |
| 1 week | 7 days, or 168 hours, or 10,080 minutes |
| 1 month (average) | 30.436875 days, or 730.485 hours |
| 1 year (365 days) | 8,760 hours, or 525,600 minutes |
| 1 leap year (366 days) | 8,784 hours, or 527,040 minutes |
| 1 year (Gregorian average) | 365.2425 days, or 31,556,952 seconds |
| 1 decade | 10 years, or about 3,652 days |
| 1 century | 100 years, or 36,524.25 days on average |
How to Convert Time Units
To convert to a smaller unit, multiply. To convert to a larger unit, divide. These are the factors used most often:
- Hours to minutes: multiply by 60. 2.5 hours = 150 minutes.
- Minutes to hours: divide by 60. 135 minutes = 2.25 hours.
- Seconds to minutes: divide by 60. 450 seconds = 7.5 minutes.
- Seconds to hours: divide by 3,600. 10,000 seconds = 2.78 hours.
- Days to hours: multiply by 24. 3 days = 72 hours.
- Hours to days: divide by 24. 100 hours = 4.17 days.
- Weeks to hours: multiply by 168. 2 weeks = 336 hours.
- Years to hours: multiply by 8,760 for a common year or 8,784 for a leap year.
Why Months and Years Are Averages
Months have 28, 29, 30 or 31 days, and years have 365 or 366 days. The converter uses the average Gregorian year of 365.2425 days and the average month of 30.436875 days, which is one twelfth of that year.
The Gregorian calendar adds a leap day every four years, skips it in century years, and keeps it in century years divisible by 400. So 2000 was a leap year and 1900 was not. Over 400 years, this gives an average of 365.2425 days. For the exact number of days between two calendar dates, use a date calculator instead.
How the Second Is Defined
All time units are based on the second. Since 1967, the International System of Units has defined one second as 9,192,631,770 cycles of radiation from a cesium 133 atom. The National Institute of Standards and Technology keeps US official time with atomic clocks based on this definition.
Leap seconds were added to UTC 27 times between 1972 and 2016 to keep clocks in step with the Earth’s rotation. In 2022, the General Conference on Weights and Measures decided to stop adding leap seconds by 2035.
Small and Large Time Units
- Millisecond: one thousandth of a second. Used for web speed and computer timing. See the milliseconds to seconds converter.
- Microsecond: one millionth of a second.
- Nanosecond: one billionth of a second. Light travels about 30 centimeters in one nanosecond.
- Decade: 10 years, or about 3,652 days.
- Century: 100 years, or about 3.16 billion seconds.
Frequently Asked Questions
What is a time unit converter?
A time unit converter is a tool that changes an amount of time from one unit into others, such as hours into minutes or days into seconds. This one shows twelve units at once.
How many seconds are in a day?
There are 86,400 seconds in a day: 24 hours × 60 minutes × 60 seconds.
How many hours are in a year?
A common year has 8,760 hours and a leap year has 8,784 hours. The average Gregorian year has about 8,765.8 hours.
How many minutes are in a week?
There are 10,080 minutes in a week: 7 days × 24 hours × 60 minutes.
How do I convert hours to days?
Divide the hours by 24. For example, 60 hours is 2.5 days, or 2 days 12 hours.
How many seconds are in a year?
A 365 day year has 31,536,000 seconds. The average Gregorian year of 365.2425 days has 31,556,952 seconds.
How many days are in an average month?
The average Gregorian month has 30.436875 days. Real calendar months have between 28 and 31 days.