About the Time Unit Converter
This time unit converter turns a duration in one unit into any other — milliseconds, seconds, minutes, hours, days, weeks, months, years, decades or centuries. Choose the unit you have and the unit you want to see the headline answer, a full table of every equivalent, and a plain breakdown such as "1d 3h 46m 40s" so large numbers of seconds or minutes are easy to read.
It helps with everyday questions like how many hours are in 90 minutes, how many weeks are in 200 days, or how many seconds are in a year, and with practical jobs such as totalling timesheets, estimating project durations, or checking programming timeouts given in milliseconds.
Seconds, minutes, hours, days and weeks are fixed lengths. Months and years are not, so this converter uses the average Gregorian year of 365.2425 days and an average month of one-twelfth of that (30.436875 days). For calendar-specific spans between two dates, use a date difference calculator instead.
How to use the time unit converter
- 1Enter the length of time you want to convert.
- 2Choose the unit it is in, for example minutes.
- 3Choose the unit you want, for example hours.
- 4Read the answer, the days-hours-minutes breakdown and the full table.
Formula and method
Every unit is expressed in seconds: a minute is 60 s, an hour 3,600 s, a day 86,400 s and a week 604,800 s. The converter multiplies your number by the seconds in the source unit and divides by the seconds in the target unit, so 90 minutes = 90 × 60 ÷ 3,600 = 1.5 hours.
A year is taken as the Gregorian average of 365.2425 days (31,556,952 s), which accounts for leap years over a 400-year cycle, and a month as one-twelfth of that. The breakdown line splits the total into whole days, hours, minutes and seconds, rounded to the nearest second.
- min
- 60 seconds
- h
- 3,600 seconds
- day
- 86,400 seconds
- year
- 365.2425 days (average Gregorian year)
Worked examples
90 minutes in hours
90 × 60 = 5,400 seconds, and 5,400 ÷ 3,600 = 1.5 hours — one hour and thirty minutes.
One million seconds
1,000,000 ÷ 86,400 = 11.574 days, or 277.8 hours. Broken down, that is 11 days, 13 hours, 46 minutes and 40 seconds.
Days in a year
The average Gregorian year is 365.2425 days, which is 365.2425 ÷ 7 = 52.18 weeks — slightly more than 52 because of the extra day (or two in leap years).
A 40-hour work week in days
40 hours ÷ 24 = 1.667 full days, or 40 × 60 = 2,400 minutes of work.
Frequently asked questions
How do I convert minutes to hours?+
Divide the number of minutes by 60. For example, 135 minutes ÷ 60 = 2.25 hours, which is 2 hours and 15 minutes.
How many seconds are in a day?+
A day has 24 × 60 × 60 = 86,400 seconds. A week has 604,800 seconds and an average year about 31,556,952 seconds.
How many days are in a month?+
Calendar months have 28 to 31 days. The average month in the Gregorian calendar is 30.436875 days, which is what this converter uses for months.
How many weeks are in a year?+
A 365-day year has 52 weeks and 1 day; a leap year has 52 weeks and 2 days. The long-run average is 52.1775 weeks.
How do I convert decimal hours to hours and minutes?+
Keep the whole number as hours and multiply the decimal part by 60 for minutes. 7.75 hours is 7 hours plus 0.75 × 60 = 45 minutes.