Type a value in any box to instantly convert between time units.
Whether you are calculating project deadlines, managing a work schedule, estimating travel times, or doing physics homework, shifting between different units of time can get complicated. Our Free Time Converter removes the math entirely.
Forget the old dropdown menus. With our synchronized calculator, all you need to do is type your known value into the corresponding box, and every other unit will calculate and populate in real-time.
There are exactly 86,400 seconds in a standard 24-hour day. You can find this by multiplying 60 seconds by 60 minutes (to get 3,600 seconds in an hour), and then multiplying that by 24 hours.
A standard calendar year (365 days) contains 8,760 hours. During a leap year (366 days), the total increases to exactly 8,784 hours.
The division of hours into 60 minutes and minutes into 60 seconds dates back to the ancient Babylonians. They used a base-60 (sexagesimal) mathematical system, which was highly favored for astronomical calculations because 60 is a highly composite number—meaning it can be evenly divided by 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, and 30.