Time Converter
Convert between different time units including seconds, minutes, hours, days, weeks, and more.
Time Conversion
Common Time Periods
Time Reference Guide
Time Unit Relationships
1 minute = 60 seconds
1 hour = 60 minutes = 3,600 seconds
1 day = 24 hours = 1,440 minutes
1 week = 7 days = 168 hours
1 month = 30.44 days on average
1 year = 365.2425 days on average
1 decade = 10 years
1 century = 100 years
Precision Time Units
Nanosecond: 1 billionth of a second (10⁻⁹)
Microsecond: 1 millionth of a second (10⁻⁶)
Millisecond: 1 thousandth of a second (10⁻³)
Computer processing: Nanoseconds to microseconds
Human reaction time: ~200 milliseconds
Blink of an eye: ~100-150 milliseconds
Interesting Time Facts
• A leap year has 366 days (31,622,400 seconds)
• The average human lifespan is about 700,000 hours
• Light travels around Earth's equator in ~134 milliseconds
• The universe is approximately 13.8 billion years old
Understanding Time Conversions
Time conversions handle seconds, minutes, hours, days, weeks, months and years. Seconds, the SI base unit, anchor the calculations, with fixed steps of 60 seconds to a minute, 60 minutes to an hour and 24 hours to a day.
Larger units involve approximations because calendar months vary in length and the Gregorian year averages 365.2425 days once the leap-year rules are applied. This converter uses that average (a year of 365.2425 days, a month of 30.44 days, which is that year divided by twelve) so longer-span conversions are consistent and reproducible.
Frequently Asked Questions
How many seconds are in a day?
There are 86,400 seconds in a day (24 × 60 × 60).
How many minutes are in a week?
There are 10,080 minutes in a week (7 × 24 × 60).
How many days are in a year?
A common year has 365 days; the average year, accounting for leap years, is 365.25 days.
How many hours are in a year?
A 365-day year contains 8,760 hours.