Time Calculator
Add or subtract time values in HH:MM:SS format. For workouts, projects, and time tracking.
How to Use
Enter your values in the fields above and click Calculate to get instant results. All computations run locally in your browser. No data is ever uploaded or stored.
Related Calculators
Time Arithmetic Made Easy
CalcSolver's time calculator adds and subtracts hours, minutes, and seconds — perfect for tracking work shifts, calculating travel durations, or managing event timelines. It handles the carry-over between units (60 seconds → 1 minute, 60 minutes → 1 hour) automatically.
2h 45min + 1h 30min = 4h 15min. Subtracting: 8h 00min − 3h 25min = 4h 35min. Multiple additions work too: 1h 20min + 45min + 30min = 2h 35min — useful for combining multiple task durations into a total.
Common scenarios: calculating total work hours across multiple shifts (combine with CalcSolver's work hours calculator), planning travel with multiple legs, converting cooking preparation times, and tracking exercise durations. The time zone converter handles cross-zone time calculations.
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Frequently Asked Questions
How do I add or subtract time?
Enter the starting time and add or subtract hours, minutes, and seconds. The calculator handles overflow (e.g., adding 90 minutes to 11:45 gives 1:15) and date changes.
How do I calculate the duration between two times?
Enter the start and end times. The calculator computes the difference in hours, minutes, and seconds, accounting for midnight crossings.
Can I calculate time in different formats?
Yes, the calculator supports 12-hour (AM/PM) and 24-hour formats, and can convert between them.