calc.js - evaluate expressions for Math

Flexible expression parser and offers an integrated solution to work with numbers, big numbers, complex numbers, units, and matrices. Powerful and easy to use.

Install

npm install calc.js

Usage

var calc = require('calc.js');

calc('12 / (2.3 + 0.7)');    // 4
calc('5.08 cm to inch');     // 2 inch
calc('sin(45 deg) ^ 2');     // 0.5
calc('9 / 3 + 2i');          // 3 + 2i
calc('det([-1, 2; 3, 1])');  // -7

Credit

Thanks to mathjs eval.

Source 

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