Every time I want to do a quick calculation in the browser, the standard path is:
- Open a new tab
- Type the math into the URL bar
- Wait for Google to load a search result
- Find the calculator widget below the ads
- Use it
This is 10 seconds for a 2-second answer.
The alternative: make the new tab itself a calculator.
Quick Calculator and Unit Converter for Firefox
Install this Firefox extension and every new tab becomes a full calculator. Open a new tab — the calculator is there immediately.
What it calculates:
- Basic arithmetic (+, -, ×, ÷)
- Percentages
- Scientific notation
- Powers and roots
What it converts:
- Length (meters, feet, inches, miles, km)
- Weight (kg, lb, oz, grams)
- Temperature (Celsius, Fahrenheit, Kelvin)
- Volume (liters, gallons, cups, fl oz)
- Currency (live exchange rates from public API)
Quick Calculator and Unit Converter — Firefox Add-ons
Who this is for
If you do math throughout the day: every calculation is one new tab away instead of a URL-bar search.
If you work with measurements: unit conversion between imperial and metric without navigating to a conversion site.
If you deal with international pricing: live currency conversion without opening a finance site.
What you give up
The new tab is replaced by the calculator. You lose:
- The default Firefox new tab (recent history, suggested sites)
- Whatever you were previously using as a new tab page
If you use the new tab primarily for navigation, this may not be worth the trade-off.
If you open a new tab and immediately type something, the Quick Calculator opens first — but the address bar is still accessible for searches.
Install it
Quick Calculator and Unit Converter — Firefox Add-ons
Free. No account required. Works in Firefox.
Quick Calculator is one of 11 Firefox extensions I built — see the full series.
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