# Unit Converter

> Simple and powerful toolbar popup with unit conversion. Supports Area, Length, Mass/Weight, Pressure, Force, Speed, Temperature, Time and Volume conversions. Convert imperial to metric and vice versa.

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

## Overview

- **ID:** `unitconverter`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** NNKOD
- **Category:** other
- **Daily users:** 534
- **Weekly downloads:** 2
- **Rating:** 4.21 / 5 (19 ratings)
- **Version:** 1.5
- **Last updated:** 2020-04-16
- **First published:** 2018-07-07
- **Size:** 50 KB
- **Data as of:** 2026-09-09
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/unitconverter/)
- **Website:** [https://codeberg.org/NNKOD/Unit-Converter](https://codeberg.org/NNKOD/Unit-Converter)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/unitconverter/privacy/](https://addons.mozilla.org/firefox/addon/unitconverter/privacy/)

## Description

Unit Converter is a precise and user-friendly Chrome extension that lets you quickly convert between 121 units across multiple measurement categories. With support for Area, Length, Mass/Weight, Pressure, Force, Speed, Temperature, Time, and Volume, this toolbar popup simplifies metric-to-imperial and imperial-to-metric conversions seamlessly. Perfect for engineers, students, and professionals, it supports a comprehensive range of units such as kilometres, pounds, kilopascals, knots, and many more. Enhance your productivity by having a reliable, instant conversion tool right in your browser toolbar.

## Rankings

- #4,797 — Overall
- #10 — united
- #17 — temperature
- #32 — convert
- #99 — conversation
- #133 — force

## Permissions and access

### Permissions

- `storage`

## Safety

- **Risk impact:** Very low risk impact
- **Risk likelihood:** Low risk likelihood

### Analysis details

- 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).

## Review summary

Users appreciate the Unit Converter add-on for its convenience, simplicity, and comprehensive metric conversions. However, multiple reviews highlight the absence of keyboard shortcuts and context menu integration, making it less ergonomic. Another common issue is the lack of automatic detection of selected numbers for conversion, requiring manual input. The add-on also falls short in presenting imperial length units in the conventional feet and inches format. Additionally, safety concerns arose due to antivirus flags and compatibility problems with newer Firefox versions, limiting usability for some users.

### Pros

- Convenient and solid tool for quick unit conversions.
- Simple and user-friendly interface making it easy to use.
- Comprehensive coverage of common metric conversions.
- Helpful for converting very large or very small units.
- Effective and accurate unit conversion between metric and imperial systems.

### Cons

- Lack of keyboard shortcuts or context menu for faster access.
- Does not detect or use highlighted/selected numbers for conversion automatically.
- Imperial length conversions are only provided in decimal form, not in feet and inches format.
- Potential false positive triggering by some antivirus software, causing safety concerns.
- Compatibility issues with newer Firefox versions due to updated extension standards.

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