For quick arithmetic — percentages, unit conversions, tip calculations — most people open a search engine and type the equation into the search bar. This works, but it means your browser history is filled with math queries and you are dependent on a network connection.
Quick Calculator and Unit Converter for Firefox is a faster alternative.
What it does
The extension replaces the Firefox new tab with a full calculator that handles:
- Standard arithmetic (add, subtract, multiply, divide)
- Percentages
- Unit conversions (length, weight, temperature, currency)
- Keyboard input
Quick Calculator and Unit Converter — Firefox Add-ons
Setup
Install the extension. Open a new tab. The calculator is there.
No configuration, no account, no setup.
Offline operation
The calculator runs entirely in the browser. It does not need a network connection. For anyone working in locations with intermittent connectivity, this is a reliable tool.
The only exception is live currency conversion, which requires a network request to fetch exchange rates.
Who it works for
Good fit:
- Anyone who does frequent quick calculations during the workday
- People who want to avoid cluttering search history with arithmetic
- Anyone who wants a calculator that works offline
Not a good fit:
- People who need scientific or graphing calculator functions
- People who need calculation history or export
Comparison with Google Calculator
Google's search calculator is accurate and works for most queries. The browser extension is faster (no search query needed), works offline, and does not require opening a search engine. For quick calculations that you do several times per day, the extension is less friction.
Install Quick Calculator for Firefox
Quick Calculator is one of 11 Firefox extensions I built — see the full series.
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