# Metrication

> Helps users of the metric system by converting and replacing Imperial and US units of measure with metric (SI) units directly within a web page. A hotspot will popup with the original value, conversion workings and potential ambiguities.

Canonical page: [https://chrome-stats.com/d/metrication](https://chrome-stats.com/d/metrication)

## Overview

- **ID:** `metrication`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** DeltaMikeCharlie
- **Category:** other
- **Daily users:** 80
- **Rating:** 3.64 / 5 (11 ratings)
- **Version:** 0.0.7
- **Last updated:** 2019-04-27
- **First published:** 2019-03-02
- **Size:** 140 KB
- **Data as of:** 2026-09-06
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/metrication/)
- **Website:** [http://deltamikecharlie.yolasite.com/metrication.php](http://deltamikecharlie.yolasite.com/metrication.php)

## Description

Metrication is a Firefox add-on designed for users who prefer the metric system. It automatically identifies Imperial and US customary units on web pages and replaces them with equivalent metric (SI) units, making texts easier to understand for metric audiences. 

The extension offers detailed pop-up hotspots that reveal the original value, detailed conversion calculations, possible alternate conversions, and explanations of ambiguities. It recognizes both full and abbreviated unit forms and intelligently scales units and decimal precision based on magnitude to offer practical metric equivalents. Advanced features include handling compound units (like "miles per gallon") and compound values (such as "5 feet 11¾ inches") by providing meaningful metric conversions.

Metrication also accounts for cultural differences in units such as gallons and addresses ambiguities with units like ounces by providing context-aware alternatives. Users can view alternate conversions or revert to the original text as needed. This tool is ideal for readers and professionals seeking accurate, context-sensitive metric conversions directly within their browsing experience.

## Rankings

- #12,992 — Overall
- #60 — location
- #69 — value
- #71 — united
- #79 — education
- #102 — education

## Permissions and access

### Permissions

- `<all_urls>`
- `clipboardWrite`
- `tabs`
- `menus`
- `storage`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Low risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/metrication)