Enter up to three time values in hh:mm:ss format and choose to add or subtract them. Fill in Hours, Minutes, and Seconds for each time entry, and this Time Calculator returns the total duration in hh:mm:ss, total hours, total minutes, and total seconds.
Total Duration (hh:mm:ss)
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Total Hours
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Total Minutes
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Total Seconds
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To add times, sum the hours, minutes, and seconds of each entry separately. If the total seconds exceed 59, subtract 60 from seconds and carry 1 to minutes. If the total minutes then exceed 59, subtract 60 from minutes and carry 1 to hours. This calculator handles all of that automatically.
Yes. Select the '− Subtract' operator and the calculator will subtract Time 2 (and Time 3, if entered) from Time 1. If the result would be negative, the output will reflect a negative duration shown with a minus sign.
Minutes and seconds must each be between 0 and 59, matching standard time notation. Hours can range from 0 to 999, allowing you to work with very large durations such as total project hours or cumulative work time.
hh:mm:ss stands for hours:minutes:seconds. It's a standard time duration format where two digits represent each component — for example, 02:15:30 means 2 hours, 15 minutes, and 30 seconds.
Total hours is calculated by converting the entire duration to seconds and dividing by 3600. For example, 1:30:00 equals 5400 seconds, which is 1.5 total hours. This is useful for payroll, billing, or project tracking.
Yes — this calculator supports up to three time entries. Simply fill in the optional Time 3 fields (hours, minutes, seconds) and the result will include all three values in the addition or subtraction.
Converting to total seconds is useful for programming, scientific calculations, or any scenario where you need a single numeric value representing duration. For example, video editors and data analysts often work with raw seconds rather than hh:mm:ss.
Adding durations means combining intervals — for example, 1 hour + 45 minutes = 1:45:00. Calculating time between clock times (e.g. 9:00 AM to 11:30 AM) is a different operation requiring a start and end time. This calculator is designed for duration addition and subtraction.