Add or subtract a duration from a clock time, or sum multiple durations.
Result: —
Tips: If the result crosses midnight, you’ll see “next day” / “previous day”.
Shortcuts: Enter calculate · R reset.
Total: 00:00:00
0 seconds · 0 minutes
Sum durations is useful for tracking total study time, workouts, or shift blocks.
About this time calculator
This time calculator lets you quickly add or subtract a duration from a clock time (for example, “14:30 + 1:15”),
and it shows the correct result even if it goes past midnight. You can also sum multiple durations to get a total
time for study sessions, work blocks, or workouts. The tool works fully in your browser (no server needed) and saves
your last settings so you can reuse it instantly. Use it to plan schedules, estimate end times, and track totals.
Explanation
Add or subtract time values (hours/minutes/seconds).
Useful for summing durations (e.g., workouts, study sessions, video lengths).