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How It Works

1. Enter start and end times: Input two times (hours, minutes, seconds) or select from the time pickers to define the range you want to measure.
2. Add or subtract durations: Optionally chain multiple time intervals together — add breaks, subtract pauses, or combine multiple segments.
3. Read the result: The total duration displays in hours, minutes, and seconds. Copy or use the result directly.

Why Use Duration Calculator?

Calculating durations manually is tedious and error-prone, especially across midnight boundaries or when dealing with multiple segments. Whether you're timing a video, calculating billable hours, measuring workout intervals, or working out how long an event lasts, the Duration Calculator handles the math instantly — including edge cases like crossing midnight or summing dozens of intervals.

Features

• Start/end time input: Enter or pick any two times to calculate the interval between them.
• Multi-segment support: Add multiple time blocks and get the combined total duration.
• Midnight crossover: Correctly handles durations that span midnight (e.g., 11:30 PM to 2:00 AM = 2h 30m).
• Hours, minutes, seconds: Results shown in full precision down to seconds.
• Instant calculation: No submit button needed — results update as you change values.

Frequently Asked Questions

How do I calculate time across midnight?

Enter the start time before midnight and the end time after midnight. The calculator automatically detects the overnight span and returns the correct duration (e.g., 10:00 PM to 6:00 AM = 8 hours).

Can I add multiple time segments together?

Yes. Use the multi-segment mode to add as many time blocks as needed. This is useful for calculating total hours worked across multiple sessions or summing video clip lengths.

What format should I use for time input?

Use the standard HH:MM or HH:MM:SS format. The tool accepts 24-hour time and converts to a readable duration automatically.