Time Calculator
Add or subtract hours, minutes, and seconds, and convert between time units for scheduling and time tracking.
Add or subtract hours, minutes, and seconds, and convert between time units for scheduling and time tracking.
You enter time values in hours, minutes, and seconds, and the calculator adds or subtracts them while correctly handling the fact that there are 60 seconds in a minute and 60 minutes in an hour. So adding 45 minutes to 1 hour 30 minutes gives 2 hours 15 minutes, not 1 hour 75 minutes. The tool manages all the carrying and borrowing between units automatically, which removes the common errors that occur when doing time arithmetic by hand.
Time uses a base-60 system for seconds and minutes and a base-24 system for hours in a day, rather than the base-10 system of ordinary numbers. This means you cannot simply add the digits as you would with decimals; 70 minutes must roll over into 1 hour and 10 minutes. Because of these mixed bases, time calculations are easy to get wrong manually, which is exactly why a dedicated calculator is helpful.
Yes. When a time span runs past midnight, for example from 10 PM to 6 AM, the calculator accounts for the day boundary and returns the correct total duration of 8 hours. Handling overnight periods correctly is important for shift work, travel times, and any schedule that does not start and end on the same calendar day, and the tool does this without you needing to add 24 hours manually.
This time calculator focuses on adding and subtracting durations expressed in hours, minutes, and seconds. The hours calculator is geared toward finding the elapsed time between a specific start and end clock time, such as computing worked hours from a start to a finish. They overlap but suit slightly different tasks, so choose the one that matches whether you are combining durations or measuring a span between two clock readings.
Yes. The calculator can express a result in mixed units or convert a duration entirely into one unit, such as showing a total purely in minutes or seconds. This is handy for tasks like converting a workout time, a cooking duration, or a media length into a single unit for comparison or data entry. The conversions follow the standard relationships of 60 seconds per minute and 60 minutes per hour.