Convert between seconds, minutes, hours, days, weeks and years.
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How do you convert between seconds, minutes, hours and other time units?
Each value is converted to seconds, then to the target unit; for example, 2 hours = 120 minutes = 7,200 seconds. Months and years use averages (1 month ≈ 30.44 days, 1 year = 365.25 days). Seconds, minutes, hours, days and weeks are exact, while months and years vary, so standard averages are used.
Understanding your result
Seconds, minutes, hours, days and weeks are exact. Months and years vary, so this tool uses standard averages for them.
Formula and method
Each value is converted to seconds, then to the target unit. Months and years use averages (1 month ≈ 30.44 days, 1 year = 365.25 days).
Assumptions and limitations
Seconds, minutes, hours, days and weeks are exact. Months and years use averages (a year is 365.25 days and a month is one twelfth of that), because calendar months and leap years vary. For exact calendar spans between two dates, use a date-difference tool rather than this unit converter.
Worked example
2 hours = 120 minutes = 7,200 seconds.
Common time-unit conversions
| Convert | Equals |
|---|---|
| 1 hour | 60 minutes |
| 1 day | 24 hours |
| 1 week | 7 days |
| 1 year | 365.25 days (avg) |
| 1 minute | 60 seconds |
| 1 day | 86,400 seconds |
| 1 hour | 3,600 seconds |
| 1 year | 8,766 hours (avg) |
| 1 month | 30.4375 days (avg) |
| 1 week | 168 hours |
How to use this tool
- Enter the amount of time to convert.
- Pick the time units to convert from and to.
- Read the result and the full breakdown in every unit.
Common mistakes to avoid
- Treating every month as 30 days — the average is about 30.44 days.
About the Time Unit Converter
Convert a duration between time units, from milliseconds up to years. Enter a value and see every unit at once.
Who should use this tool
Anyone converting durations — planners turning weeks into days or hours, developers reasoning about seconds and milliseconds, students on physics problems, and people estimating how long a task or project runs. It covers milliseconds through to average months and years.
Benefits
- Spans the full range from milliseconds to years in one tool
- Exact factors for the fixed units (seconds, minutes, hours, days, weeks)
- Clearly labels month and year as averages so results are not misread
- Fast, offline and free
Practical use cases
- Converting a project length between weeks, days and hours
- Turning a timeout or duration in seconds into minutes or hours
- Estimating study or work time across different units
- Solving physics problems that mix seconds and hours
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Frequently asked questions
How many seconds are in an hour?
There are 3,600 seconds in one hour.
Why are months approximate?
Months have different lengths, so the converter uses the average month of about 30.44 days.
How many seconds are in a day?
There are 86,400 seconds in a day (24 hours x 60 minutes x 60 seconds). A week has 604,800 seconds, and an hour has 3,600.
How many hours are in a year?
Using an average year of 365.25 days, there are about 8,766 hours in a year. A common calendar year of 365 days has 8,760 hours; this tool uses the 365.25-day average to account for leap years.