TopToolsAiCalculate the duration between a start time and end time in hours and minutes — handles overnight ranges that cross midnight too. From 10:45pm to 6:15am the next morning, the tool correctly returns 7 hours and 30 minutes rather than a negative number, by recognising the range crosses into the next day.
Last updated: 1 Sep 2026
How to use Time Duration Calculator
- Pick a start time and an end time.
- Click "Calculate Duration" to see the total hours and minutes between them (handles overnight spans automatically).
Frequently asked questions
Can I calculate overnight durations (like 11 PM to 6 AM)?
Yes — if the end time is earlier than the start time, it automatically assumes the end time is on the next day.
Does it handle AM/PM or 24-hour format?
Your browser's native time picker handles the input format automatically based on your device settings.
Can I use this to total up work shift hours?
Yes — enter your clock-in and clock-out time to get the exact duration, useful for timesheets or hourly pay calculations.
Does the result include seconds?
No — the result is shown in hours and minutes, matching the precision of the time picker inputs.
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