# Metric Unit Conversion Calculator

> Convert metric and imperial units instantly across 10 categories: length, area, volume, mass, speed, time, temperature, pressure, energy, and data.

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

## Overview

- **ID:** `metricunitconverter`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Metric Unit LTD
- **Category:** search-tools,language-support
- **Daily users:** 1
- **Version:** 1.3.6
- **Last updated:** 2026-07-21
- **First published:** 2026-06-05
- **Size:** 57 KB
- **Data as of:** 2026-09-07
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/metricunitconverter/)
- **Website:** [https://metricunitconverter.com/](https://metricunitconverter.com/)

## Description

Metric Unit Conversion Calculator is a fast, offline unit converter for your browser. Convert between metric and imperial units across 10 categories: Length, Area, Volume, Mass, Speed, Time, Temperature, Pressure, Energy, and Data - instantly as you type.

Type a value into any unit field and every other unit in the category updates in real time. No convert button, no page reloads, no internet connection required for conversions. Switch categories with one click and clear all fields instantly.

Supported conversions include miles, kilometers, feet, inches and nautical miles; acres, hectares and square units; US and imperial gallons, cups, tablespoons and liters; pounds, ounces, kilograms and stones; mph, km/h and knots; Celsius, Fahrenheit and Kelvin; pascals, bars and PSI; joules, calories and kilowatt-hours; and digital storage from bits to terabytes.

With your consent, the add-on collects limited anonymous technical data (such as install date and consent status) to attribute installs correctly. You can review or change this choice anytime from the add-on's Settings page. Details are available in our Privacy Policy at <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/24dd6a89bbd8e9494a1008045cd55cf9eec809a6accf5b1b47a4cb0b3ac1735d/http%3A//metricunitconverter.com/privacy" rel="nofollow">metricunitconverter.com/privacy</a>.

## Rankings

- #94,393 — Overall
- #57 — temperature
- #180 — conversation
- #228 — calculator
- #243 — calculus

## Permissions and access

### Permissions

- `tabs`
- `activeTab`
- `storage`
- `search`
- `cookies`
- `alarms`
- `webRequest`
- `scripting`

### Host permissions

- `<all_urls>`

### Content script matches

- `metricunitconversioncalculator.com`
- `*.metricunitconversioncalculator.com`

## Safety

- **Risk impact:** Very high risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- 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/metricunitconverter)