Time Calculator

Add or subtract time durations and find the span between two clock times.

—Result (h:m:s)
—In hours
—In minutes
—In seconds
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How to use Time Calculator

Three quick steps — no sign-up needed

  1. Step 1

    Choose a mode

    Select Add / subtract durations or Time between two clock times.

  2. Step 2

    Enter times or durations

    For durations, fill hours, minutes, and seconds for each side and pick add or subtract. For clock span, set start and end times.

  3. Step 3

    Read the result

    See the total duration or the elapsed time between the two clocks.

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About Time Calculator

Time Calculator adds and subtracts durations in hours, minutes, and seconds, or measures the time between two clock times. Schedulers searching "add time calculator", "hours minutes seconds calculator", or "time between two times" need carry-over handled correctly past 60 minutes and 60 seconds.

Choose Add / subtract durations (two h/m/s blocks and + or -) or Time between two clock times (start and end). Results normalise excess seconds into minutes and minutes into hours.

Overnight shifts may cross midnight - check that the mode you use matches whether times are on the same calendar day. Time zones are not converted here.

Duration arithmetic helper for work logs and study plans - not a timesheet payroll system.

Benefits of Time Calculator

Durations and clock span Two modes for different time problems.
H/M/S precision Track seconds when needed, not only hours.
Add or subtract Build or compare total worked time.
Normalised output Overflow seconds and minutes handled cleanly.

Frequently asked questions

How do I add two durations?

Choose duration mode, enter both h/m/s values, select Add, and calculate.

How do I find time between 9:00 and 17:30?

Use clock mode with those start and end times.

What about overnight times?

If end is "before" start on the clock, confirm whether the interval should cross midnight.

Does it convert time zones?

No - local clock arithmetic only.

Can I subtract time?

Yes - choose Subtract in duration mode.