Calculate values of mathematical expressions

calc-extension promo image
What is calc-extension?

calc-extension is a Firefox add-on that provides a convenient way to calculate values of mathematical expressions. It supports different syntaxes and functions, making it useful for mathematicians, programmers, and daily browser users. With features such as session saving and exporting to clipboard, calc-extension aims to meet the needs of all users.

Stats date:
Users: 48
Rating: 5.00 (3)
Version: 5.3 (Last updated: 2018-11-23)
Creation date: 2018-02-17
Weekly download count: NaN
Firefox on Android: Yes
Manifest version: 2
  • storage
Size: 47.50K
URLs: Website
Risk impact: Very low risk impact
Risk likelihood: Low risk likelihood

Other platforms

Not available on Chrome
Not available on Edge

The extension strives to be useful for everybody quickly needing brief or mid-long calculations: in daily “browser” life, as a mathematician, or as a programmer - there is support for all needs.

Formulas can be entered in the typical mathematician's or programmer's syntax - both is understood. There is also support for lengthy sessions (saving/restoring, exporting to clipboard, etc).

The original motivation was to experiment with a Pratt parser. There is already a much richer expression syntax than in most languages (implicit multiplication signs, no braces necessary for function calls), and it would be simple to extend the syntax to a more full-blown “language”. (In fact, earlier versions of calc-extension had a simpler syntax. Readers interested in the parser implementation can check data/js/parser.js).

After installing calc-extension, it can be used as follows.

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User reviews
by Thanos Massias, 2020-04-15

Great expression calculator! It will better if it support Number Suffixes like "k, M, G, Ki, Mi, Gi,....." ( Number Suffixes:
by circcc, 2018-11-23

Such a simple extension, yet so useful! Sure, there's Wolfram Alpha. Sure, there's even Google's Search evaluation of arithmetic expression. But /nothing/ I've tried beats the speed and simplicity of this little calculator extension. The workflow is unbeatable: new tab, type 'calc' (I saved an extension bookmark under that name), type the expression, return, done. Very little things I'd like to see changed, but maybe one feature that would be appreciated would be the ability to *copy* the returned values (right now, selecting the return line doesn't seem to work, so copy fails). Other than that: perfect! (edit after response) Thanks for helping me out here. Guess my sloppy reading of the options lead me to miss that this extension's even better than I thought :)
by Bert, 2018-03-27
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Risk impact

calc-extension is safe to use. It does not request any sensitive permissions.

Risk likelihood

calc-extension has earned a fairly good reputation and likely can be trusted.

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