Metric Converter

Converts US/Imperial units to SI/Metric on visible text only, rounding metric values to 2 decimals.

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Author: Alyssa B. Morton
Daily installs: 0
Total installs: 2
Ratings: 0 0 0
Version: 1.2
Created: 2025-11-07
Updated: 2025-11-07
Size: 4.05 KB
License: MIT
Applies to: All sites

Description:

The Metric Converter userscript automatically converts US/Imperial units on webpages to SI/Metric units and appends the converted value in brackets behind the original US unit. All metric values are rounded to 2 decimal places for clean display. Ideal for shopping, cooking, recipes, and online research.

Features:

Converts length: inch, feet, yard, mile → meters/kilometers
Converts weight: ounce, pound, stone → kilograms
Converts volume: cup, pint, quart, gallon, fl oz → liters
Converts speed: mph → km/h
Converts fuel efficiency: mpg → L/100 km
Converts temperature: °F → °C
Converts area: sq. ft, sq. yd → m²
Converts volume: cu. in, cu. ft → m³
All converted metric values are rounded to 2 decimal places
Only converts visible text; ignores scripts, styles, inputs, textareas, links, and code blocks

Instructions:

Step 1: Install a Userscript Manager

Install a userscript manager such as Violentmonkey or Tampermonkey in your browser.

Step 2: Add the Script

Copy the entire Metric Converter userscript code and create a new script in your userscript manager.

Step 3: Save and Enable the Script

After adding the script, save it and ensure it is enabled in your userscript manager.

Step 4: Browse Normally

Navigate to any website. US/Imperial units in visible text will automatically display converted metric values in brackets.

Notes:

The script only converts visible text, so it won’t break links, forms, or code snippets.
All metric values are rounded to 2 decimal places for readability.
If conversions do not appear immediately, refresh the page.