Add or subtract lengths of time. This free time calculator combines two durations in hours, minutes and seconds and shows the result in normalized form plus total hours, minutes, seconds and days.
Two durations
Duration A
h
m
s
Duration B
h
m
s
Enter two durations in hours, minutes and seconds, then add or subtract them. Leave a box blank for zero. The result is normalized and also shown in single units.
Result
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Enter two durations
In hours
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In minutes
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In seconds
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In days
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Time is added by converting both durations to seconds, combining them, then converting back to hours, minutes and seconds. Subtracting a larger duration gives a negative result.
Use this free time calculator to add or subtract two lengths of time. Enter durations in hours, minutes and seconds, and get the result normalized and converted to single units.
What this time calculator does
A time calculator adds or subtracts two durations given in hours, minutes and seconds. It returns a tidy h/m/s result plus the same amount expressed in total hours, minutes, seconds and days.
How time is added and subtracted
1. Convert each duration to seconds
2. Add (or subtract) the two totals
3. Convert back to hours, minutes and seconds
For example, 2h 30m + 1h 45m = 4h 15m, and 1h 15m − 45m = 30m. Subtracting a larger duration from a smaller one gives a negative result.
Time unit conversions
Unit
Equals
1 hour
60 minutes · 3,600 seconds
1 day
24 hours · 1,440 minutes
1 minute
60 seconds
Time vs hours vs date
Use this time calculator for durations (lengths of time). To find hours worked between a clock-in and clock-out, use the Hours Calculator; to count days between two calendar dates, use the Date Calculator.
How to use the time calculator
Choose add or subtract.
Enter both durations in hours, minutes and seconds.
Read the result and its unit conversions.
Time Calculator FAQ
How do I add two times together?
Enter each duration in hours, minutes and seconds, keep the operation on "add," and the calculator combines them — for example 2h 30m + 1h 45m = 4h 15m.
How do I subtract time?
Switch to "subtract" and the calculator works out Duration A minus Duration B. If B is larger, the result is shown as negative.
Can it convert a duration to minutes or seconds?
Yes. Every result is also shown in total hours, total minutes, total seconds and days.
What's the difference from an hours calculator?
This handles durations (lengths of time). To find hours worked between a start and end clock time, use the Hours Calculator instead.
Do I have to fill in every box?
No. Leave any hours, minutes or seconds box blank and it's treated as zero.
Is the time calculator free?
Yes, this time calculator is completely free, needs no sign-up, and gives instant results in your browser.
