Time Calculator
Add or subtract two durations in hours, minutes, and seconds.
Runs in your browser — nothing is sent or saved.
How to add or subtract time
- Enter the first time in hours, minutes, and seconds.
- Choose plus or minus.
- Enter the second time.
- Read the total in hours, minutes, and seconds.
What the tool does
This is time addition and subtraction in one place. Enter two lengths of time as hours, minutes, and seconds, pick plus or minus, and it gives the total. It also shows that total as plain hours, as minutes, and as seconds, so you can drop it straight into whatever you are working on.
Negative results
If you subtract a longer time from a shorter one, the answer is negative, and the tool shows it with a minus sign rather than hiding it. That is useful when you are checking whether one time duration is longer than another.
Where it helps
Add up several task times, work out how long is left before a deadline, total the length of a playlist, or subtract a rest break from a session. Because it carries seconds, it suits timing jobs as well as rough planning.
FAQ
How do I add two times together?
To add time, enter each one as hours, minutes, and seconds, leave the operation on plus, and read the total. The tool carries seconds into minutes and minutes into hours for you.
Can it subtract time?
Yes. Switch the operation to minus. If the result is below zero, it is shown as a negative time duration.
Does it handle hours minutes seconds?
Yes. Every field takes whole numbers, and the total is given in hours, minutes, and seconds, plus each single unit on its own.
Is this the same as time between two clock times?
No. For hours worked between a start and end clock time, use the hours calculator instead.
Are my numbers private?
Yes. Everything runs in your browser and nothing is saved.