How to use it?

Download and unzip unit converter

Copy the ee2/third_party/unit_convertor folder to /system/expressionengine/third_party/ directory

In Control Panel, go to Add-Ons → Field Type and click the Install-link in the unit converter.

Once Unit Converter is installed, you can add a Unit Converter to the Publish Page by following these steps:

Go to Custom Field Preferences

EE2: Admin → Channel Administration → Custom Fields

Click the “Add/Edit Custom Fields” link beside the field group

Click the “Create a New Custom Field” button

Give the new field a name and a label, and choose “Unit Converter ” in the Field Type dropdown

Configure the Unit Converter field to suit your needs

Click the Submit button

Template Tags - Simple Primary Tag Pair Example:

Template Tags - Floating Primary Tag Pair Example:

We hope this Add-on will help you to reduce number of lines of code for small conversions.
Devot-ee Link for this add-on: https://devot-ee.com/add-ons/unit-converter