Time Unit Converter

Convert any time value between seconds, minutes, hours, days, weeks, months, and years. Instant bidirectional conversion.

Milliseconds:

Seconds:

Minutes:

Hours:

Days:

Weeks:

Months:

Years:

How the conversion works

Enter a value in any unit and the converter shows it in all the others at once: seconds, minutes, hours, days, weeks, months and years, with large numbers formatted for readability. The exact factors are 60 seconds per minute, 60 minutes per hour, 24 hours per day and 7 days per week. Months and years are the awkward ones: this tool uses the average Gregorian year of 365.2425 days (which accounts for leap years) and a month of one twelfth of that, 30.44 days. Those averages are what most engineering and finance calculations use; for exact calendar dates, use the date calculator, which counts real month lengths.

Useful reference values

Quantity	In other units
1 day	86,400 s · 1,440 min · 24 h
1 week	604,800 s · 168 h
1 year (average)	31,556,952 s · 8,766 h · 52.18 weeks
1 million seconds	11.57 days
1 billion seconds	31.7 years
10,000 hours	416.7 days, or about 5 years at 40 h/week
A working year	~2,080 h (52 weeks × 40 h), ~1,900 h after holidays

Where it comes in handy

Software and data. Timeouts in milliseconds, retention periods in seconds, cron schedules in minutes; the Unix timestamp converter handles the related date problem.
Project planning. Turning person-hours into weeks and months, and back.
Science. Half-lives, orbital periods and reaction times reported in whatever unit the paper chose.
Everyday curiosity. How many hours are in a school year, how many weeks until a date, how many seconds old you are (the age calculator will tell you directly).