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04:30:00

Time Duration Calculator

100% Free

Calculate the duration between two times in hours, minutes, and seconds.

Real-time
Client-Side
Sum + Diff
Durations (one per line — HH:MM or HH:MM:SS)
Total
04:30:00
= 4.5 hours · 16200 seconds

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<iframe
  src="https://tools.town/embed/time-duration-calculator/"
  width="100%"
  height="600"
  style="border:none; border-radius:12px;"
  loading="lazy"
  title="Time Duration Calculator">
</iframe>

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How to use

  1. Enter a start time and an end time (HH:MM:SS format).
  2. Toggle spans midnight if the end time is on the next day.
  3. See the duration in hours, minutes, and seconds.

When to use

Timesheets, shift calculations, meeting duration tracking, or any time you need the elapsed time between two clock readings.

Frequently Asked Questions

Does it handle overnight durations (e.g. 11pm to 2am)?
Yes — toggle 'spans midnight' and the calculator handles next-day end times correctly.
Can I add multiple time segments?
Yes — use multi-segment mode to add up several time ranges (useful for timesheet calculations).
Is anything sent to a server?
No. All calculations run in your browser.
📖

Want to understand the math?

Browse all guides →
How to Use Time Duration Calcu
time

How to Use Time Duration Calculator — Complete Guide

Learn how to calculate time durations between two timestamps, add or subtract hours and minutes, and convert between time units using Tools.Town's free Time Duration Calculator.

8 May 2026

5 min read

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