Time CalculatorCalculators
Adds and subtracts amounts of time, or works out the time 30 minutes from 3:50.
Time Converter
This time unit converter turns hours into minutes, days into seconds, milliseconds into seconds, and years into days. It covers ten units, from nanoseconds to years.
Runs in your browser. Your data is not uploaded.
The same value in every unit
| Unit | Value | Copy |
|---|
How to use the Time Converter
- Type the Value you want to convert.
- Pick the unit it is in under From, and the unit you want under To. The swap button flips them.
- The answer updates as you type. The table below it shows the same value in every other unit, each with its own copy button.
How it works
1 min = 60 s; 1 h = 3,600 s; 1 day = 86,400 s; 1 week = 604,800 s 1 month = 30.4375 days (average of the Gregorian calendar over 4 years) 1 year = 365.25 days (Julian year) result = value × from-unit (s) ÷ to-unit (s)
Examples
- 1.5 h = 90 min.
- 1 day = 86,400 s.
- 1 year = 8,766 h (365.25 days).
- 2,500 ms = 2.5 s.
1.5 hours in every unit
The converter with the first example: 1.5 hours is 90 minutes, and the table repeats the value in every other unit, from 5,400,000,000,000 nanoseconds to 0.000171116 years. This example is one of the automated tests for the tool, so a code change that gives a different answer fails the test run.
Hour to minute conversion table
| Hour (h) | Minute (min) |
|---|---|
| 0.25 h | 15 min |
| 0.5 h | 30 min |
| 0.75 h | 45 min |
| 1 h | 60 min |
| 1.25 h | 75 min |
| 1.5 h | 90 min |
| 2 h | 120 min |
| 2.5 h | 150 min |
| 8 h | 480 min |
| 24 h | 1,440 min |
Decimal hours on time sheets: 0.25 h is 15 minutes and 0.75 h is 45 minutes.
If you have shift start and finish times rather than a duration, follow the timesheet hours guide to account for breaks and overnight shifts.
Time units and their length in seconds
| Unit | Symbol | Equals |
|---|---|---|
| Nanosecond | ns | 1 × 10^-9 s |
| Microsecond | µs | 0.000001 s |
| Millisecond | ms | 0.001 s |
| Second | s | 1 s |
| Minute | min | 60 s |
| Hour | h | 3,600 s |
| Day | day | 86,400 s |
| Week | week | 604,800 s |
| Month (30.4375 days) | month | 2,629,800 s |
| Year (365.25 days) | year | 31,557,600 s |
Months and years are averages
Seconds, minutes, hours, days, and weeks have fixed lengths. Months and years don't: a month has 28 to 31 days and a year 365 or 366. To convert them to a single number, this tool uses averages: a year of 365.25 days and a month of one twelfth of that, 30.4375 days. For the exact number of days between two dates, use the Days Between Dates calculator instead.
Limitations
- Months and years use averages, not calendar dates.
- Leap seconds are ignored.
- Time can't be negative.
Sources
- Guide for the Use of the International System of Units (SP 811), NIST. The second as the SI unit of time and the minute, hour, and day accepted for use with it.
Frequently asked questions
How many seconds are in a day?
86,400 seconds: 24 hours × 60 minutes × 60 seconds.
How do I convert decimal hours to minutes?
Multiply the hours by 60. For example, 1.75 h × 60 = 105 minutes, or 1 hour 45 minutes.
How many hours are in a year?
8,766 hours for an average year of 365.25 days. A regular 365-day year has 8,760 hours.
Related tools
Often used together with Time Converter.
Time Duration CalculatorCalculators
Measures the elapsed time between a start clock time and an end clock time.
Days Between DatesCalculators
Counts the gap between two dates in days, weeks, and months.