Time Duration Calculator

By CalculatorInn Team · Updated: 2026-03-22 · Free & accurate · Instant results

Calculate the time duration between two clock times.

Interactive Time Duration Calculator

JavaScript is required for the interactive calculator. Enable JavaScript to use this tool.

How to Use This Calculator

Step-by-Step Instructions

  1. Enter your start hour (0-23)
  2. Enter your start minute
  3. Enter your end hour (0-23)
  4. Enter your end minute
  5. Enter your duration
  6. Enter your total minutes
  7. Enter your decimal hours
  8. Results appear instantly — no button needed

Formula

Mathematical Formula

Duration = End Time - Start Time

How It Works

Converts times to minutes and calculates the difference.

Frequently Asked Questions

What about overnight durations?

If end time is before start time, it assumes the next day.

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