Quick answer: An hour is 60 minutes, so 90 min = 1.5 h; a day is 86,400 seconds.
How it's calculated
The time is changed to seconds, then to your unit. A minute is 60 s, an hour 3,600 s, a day 86,400 s and a week 604,800 s.
Months and years are not fixed lengths, so this converter uses the Gregorian averages: a year of 365.2425 days and a month of one twelfth of that (30.436875 days). For exact days between two dates use the date difference calculator; a Hijri year is about 354 or 355 days.
Some calculators use the Julian year of 365.25 days instead (31,557,600 s, with a month of 30.4375 days), so their month and year results differ from these in the fifth digit.
Worked examples
- A 90-minute match: 90 min = 1.5 h
- One million seconds: 1,000,000 s = 11.574074 d
- Hours in a year: 1 yr = 8,765.82 h
Common time conversions
| From | To |
|---|---|
| 1 h | 3,600 s |
| 1 d | 24 h |
| 1 d | 1,440 min |
| 1 d | 86,400 s |
| 1 wk | 168 h |
| 1 yr | 365.2425 d |
| 1 yr | 52.1775 wk |
| 1 yr | 8,765.82 h |
| 1 mo | 30.436875 d |
| 1,000,000 s | 11.574074 d |
Frequently asked questions
How many seconds are in a day?
86,400 (24 × 60 × 60).
How many weeks are in a year?
About 52.18: 365 days is 52 weeks and 1 day, and a leap year 52 weeks and 2 days.
Why is a month 30.44 days here?
Calendar months have 28 to 31 days. The average Gregorian month is 365.2425 ÷ 12 = 30.436875 days.
How many hours are in a year?
8,760 in a normal year and 8,784 in a leap year. This converter uses the average Gregorian year, which works out to 8,765.82.
How do I turn decimal hours into hours and minutes?
Multiply the part after the point by 60. So 1.75 hours is 1 hour and 45 minutes.
How many days are in a Hijri year?
354 or 355, about 11 days fewer than a Gregorian year, which is why Ramadan moves earlier every year. For exact dates, use the Hijri to Gregorian converter.