CALCULATE · VISUALIZE · EXPLORE

Time Duration Calculator

Calculate elapsed time, including an overnight finish.

● Live results · Runs on your device · No sign-up

Your inputs

Clock-time difference only; no time-zone or daylight-saving conversion.

Live results

Auto-updates

UNDERSTAND YOUR RESULTS

Time Duration Calculator guide

Calculate elapsed time, including an overnight finish.

How to use this tool

Enter Start time, End time, Finish on the following day?.
Change a value to update the results and illustration. Check any validation message before using the output.
Copy the results or download CSV. Reset restores the example values.

A worked example

09:00 to 17:30 on the same day is 8 hours 30 minutes, or 8.5 decimal hours.

How it works

Clock-time difference only; no time-zone or daylight-saving conversion.

Frequently asked questions

How should I interpret the illustration?

It is a visual aid, not a replacement for the numeric output. Some charts compare values with different units, and those magnitudes are not directly comparable.

Can I use the result without checking the inputs?

Check units, signs, assumptions and rounding first. The tool cannot know whether the values you enter describe the real situation correctly.