Time Duration Calculator
Duration between two times plus time adjustments.
How to use
Runs entirely in your browser. Live updates or click to run. No signup, no tracking, no data sent anywhere.
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Part of 71 free tools by Auburn AI. Category: Calculators
About this tool
The Time Duration Calculator figures out the elapsed time between two points in time — hours, minutes, and seconds. It is useful for anyone who needs to know exactly how long something took, whether you are tracking work shifts, timing an event, logging exercise, or calculating billable hours for a client invoice.
Reach for this tool when a rough estimate is not good enough. If you have a start time and an end time and need a precise duration broken down cleanly, this calculator saves you from doing the mental arithmetic yourself, especially when times cross midnight.
How to use it
- Enter your start time using the hour and minute fields, then select AM or PM.
- Enter your end time the same way, making sure AM or PM is set correctly.
- If your time range crosses midnight, enable the next-day toggle or checkbox.
- Click Calculate to see the elapsed duration in hours, minutes, and seconds.
- Copy or note the result for your records, invoice, or log.
Pro tips
- If you need to track multiple shifts back to back, note each duration separately and add them after to avoid compounding rounding errors.
- For durations crossing midnight, always confirm your end time is marked as the following day or the result will be negative and incorrect.