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Time Duration Calculator

Add hours, minutes and seconds into a clean total duration.

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Useful for study sessions, tasks, workouts, media and time logs.

Notes and next steps

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How it works

Add hours, minutes and seconds into a clean duration.

Method: Total seconds = hours × 3600 + minutes × 60 + seconds.

Worked example

1 hour, 30 minutes and 20 seconds is 90.33 minutes.

Common mistakes
  • Confusing decimal hours with hours and minutes.
  • Forgetting seconds.
  • Crossing midnight without using a deadline/date tool.
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