Time converter — decimal hours, minutes and seconds
Convert durations between HH:MM:SS, decimal hours, minutes, seconds and 24-hour days. See every unit together.
Preparing your tool…
How it works
Convert the input to milliseconds, then derive each output. Round only to the nearest millisecond. One day is exactly 24 hours; months and years are not fixed-duration units here.
Example
7.5 decimal hours equals 07:30:00, 450 minutes or 27,000 seconds. It does not mean 7 hours 50 minutes.
Can hours in HH:MM:SS exceed 23?
Yes. This is a duration, not a time of day: 36:00:00 is 36 hours. Minutes and seconds must be 00–59. Input is nonnegative and bounded to 36,525 days.