Time Converter — seconds, minutes, hours, days & years

How it works

Time units build up from the second, the SI base unit. The everyday steps are exact (NIST SP 811):

• 1 minute = 60 s, 1 hour = 3,600 s, 1 day = 86,400 s, 1 week = 604,800 s.
• Months and years vary in the calendar, so this converter uses averages: 1 year = 365.25 days (the Julian year, which accounts for leap years), and 1 month = one twelfth of a year ≈ 30.44 days.

The calculator converts your value to seconds and then to the unit you want, so any pairing works the same way. For exact calendar arithmetic — the number of days between two specific dates — use a date calculator instead, since real months and years differ in length.

Worked example

Converting 1 hour to minutes: 1 h = 60 min. Going further, 1 day = 24 h = 1,440 min, and 1 year = 365.25 days ≈ 8,766 hours.

Frequently asked questions

How many seconds are in an hour?

Exactly 3,600 — that is 60 minutes × 60 seconds. A full day is 86,400 seconds.

How many days are in a year?

This converter uses 365.25 days, the average length of a year once leap years are counted (the Julian year). A common calendar year is 365 days and a leap year 366.

Why is a month about 30.44 days here?

Because calendar months range from 28 to 31 days, the converter uses an average — one twelfth of a 365.25-day year, about 30.44 days — so month conversions are consistent.

How do I convert minutes to hours?

Divide minutes by 60, since an hour is 60 minutes. So 150 minutes is 150 ÷ 60 = 2.5 hours.

Should I use this for dates?

No. For the exact number of days between two calendar dates — allowing for the real lengths of months and leap years — use a days-between-dates calculator. This tool converts fixed lengths of time, not calendar dates.

How many hours are in a week?

168 — that is 7 days × 24 hours. A 40-hour work week is therefore just under a quarter of the week's total hours.