Date Calculator

Time Duration Calculator

Calculate elapsed time in hours, minutes, and decimal hours between two times of day.

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100% Private: Your calculation happens entirely inside your browser. Your dates are never stored or transmitted.

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What is the Time Duration Calculator?

The Time Duration Calculator computes the elapsed time between two time values, supporting normal same-day hours and overnight shifts.

How to Use This Calculator

  1. Enter the Start Time (HH:mm).
  2. Enter the End Time (HH:mm).
  3. Check "End time is on the next day" for overnight periods.
  4. Click Calculate to view hours, minutes, and decimal conversion.

Calculation Logic & Formula

Duration = End Time (minutes) - Start Time (minutes) (+ 1,440 if overnight).

Worked Example: From 09:30 to 17:45

Scenario: Calculating an employee’s daily shift length.

Calculation: 17:45 - 09:30 = 8 hours and 15 minutes.

Result: 8 hours, 15 minutes (8.25 decimal hours, 495 minutes).

Frequently Asked Questions

Related In-Depth Guides

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How to Calculate Time Duration and Decimal Hours

A guide to calculating elapsed hours and minutes, handling overnight shift rollovers, and converting time to decimal format for payroll.

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How to Calculate Working Days (Business Days)

A step-by-step guide to calculating business days between any two dates while accounting for custom weekends and public holidays.