Fixed and average time units
Seconds, minutes, hours, days and weeks have fixed lengths: 60 seconds, 60 minutes, 24 hours and 7 days. Months and years do not. A month has 28 to 31 days and a year 365 or 366, so the converter uses the average of the Gregorian calendar: a year of 365.2425 days and a month of one twelfth of that, about 30.44 days.
For the exact number of days between two calendar dates, use Days Between Dates. To find someone's age, use the Age Calculator.
Common time conversions
| From | Equals |
|---|---|
| 1 hour | 60 minutes |
| 1 day | 24 hours |
| 1 week | 168 hours |
| 1 year (average) | 365.2425 days |
| 1 year (average) | 8,765.82 hours |
| 1 month (average) | 30.436875 days |
| 1 minute | 60 seconds |
| 1 day | 86,400 seconds |
Minutes to decimal hours
Timesheets and invoices often need hours as a decimal. 45 minutes are 0.75 hours, not 0.45.
| Minutes (min) | Hours (h) |
|---|---|
| 5 | 0.08333 |
| 10 | 0.1667 |
| 15 | 0.25 |
| 20 | 0.3333 |
| 30 | 0.5 |
| 40 | 0.6667 |
| 45 | 0.75 |
| 50 | 0.8333 |
| 60 | 1 |
| 90 | 1.5 |
| 120 | 2 |
| 150 | 2.5 |
| 180 | 3 |
| 240 | 4 |
| 480 | 8 |
How to use it
- 1Pick the unit you have on the left and the unit you want on the right.
- 2Type a value on either side. The other side updates as you type, and the swap button turns the conversion around.
- 3Read the result and the factor below it, or tap any unit in the list to convert into it. Copy the result or a link to share it.
Frequently asked questions
How many seconds are in a day?
86,400: 24 hours × 60 minutes × 60 seconds.
How many seconds are in a year?
An average Gregorian year has 31,556,952 seconds. A common year of 365 days has 31,536,000, a leap year 31,622,400.
How do I turn minutes into decimal hours?
Divide the minutes by 60. 1 hour 45 minutes is 1 + 45 ÷ 60 = 1.75 hours.
Why is a month 30.44 days here?
Months have different lengths, so the converter uses the average: 365.2425 days ÷ 12. For exact calendar spans, use Days Between Dates.