Nonstop Pajama Models

    DefinitelyTyped icon, indicating that this package has TypeScript declarations provided by the separate @types/math-expression-evaluator package

    1.4.0 • Public • Published


    An extremely efficient, flexible and amazing evaluator for Math expression in Javascript.(Documentation)

    Use cases

    Input Result Explanation
    2+3-1 4 Addition and Subtraction operator
    2*5/10 1 Multiplication and Division operator
    tan45 or tan(45) 1 Trigonometric Function (tan in Degree mode)
    tan45 or tan(45) 1.619775190543862 Trigonometric Function (tan in Radian mode)
    Pi1,15,n or Pi(1,15,n) 1307674368000 Product of Sequence
    Sigma1,15,n or Sigma(1,15,n) 120 Sum of Sequence (also called summation)
    2^3 8 Exponent (note this operator is left associative like MS Office)
    5P3 60 Permutaion Method to calculate all the permutaions
    sincostan90 or sin(cos(tan(90))) 0.017261434031253 Multiple functions with or without parenthesis (both works)

    Fiddle Yourself


    Node JS

    Using npm

    npm install math-expression-evaluator


    Using bower

    bower install math-expression-evaluator

    How to run test

    npm test

    Supported symbols

    Symbol Explanation
    + Addition Operator eg. 2+3 results 5
    - Subtraction Operator eg. 2-3 results -1
    / Division operator eg 3/2 results 1.5
    * Multiplication Operator eg. 2*3 results 6
    Mod Modulus Operator eg. 3 Mod 2 results 1
    ( Opening Parenthesis
    ) Closing Parenthesis
    & Bitwise AND eg. 3&1 results 1
    Sigma Summation eg. Sigma(1,100,n) results 5050
    Pi Product eg. Pi(1,10,n) results 3628800
    n Variable for Summation or Product
    pi Math constant pi returns 3.14
    e Math constant e returns 2.71
    C Combination operator eg. 4C2 returns 6
    P Permutation operator eg. 4P2 returns 12
    ! factorial operator eg. 4! returns 24
    log logarithmic function with base 10 eg. log 1000 returns 3
    ln natural log function with base e eg. ln 2 returns .3010
    pow power function with two operator pow(2,3) returns 8
    ^ power operator eg. 2^3 returns 8
    root underroot function root 4 returns 2
    sin Sine function
    cos Cosine function
    tan Tangent function
    asin Inverse Sine function
    acos Inverse Cosine function
    atan Inverse Tangent function
    sinh Hyperbolic Sine function
    cosh Hyperbolic Cosine function
    tanh Hyperbolic Tangent function
    asinh Inverse Hyperbolic Sine function
    acosh Inverse Hyperbolic Cosine function
    atanh Inverse Hyperbolic Tangent function


    Amazing support for Sigma and Pi

    This is a fantastic feature of this calculator that it is capable of evaluating expressions containing Sigma and Pi. Passing Sigma(1,100,n) will evaluate to 5050 as n is summationed from 1 to 100. and Pi(1,15,n) will evaluate to 1307674368000 as n is multiplied from 1 to 15 which is equal to 15!

    Parenthesis less expression

    If a expression is readable by human then it is readable by this evaluator. There is no need to wrap every function inside parenthesis. For eg. sin90 will work totally fine instead of sin(90)


    Removed lodash.indexof and used native Array.prototype.indexOf hence dropping suppports for IE8 and below.

    This will reflect in next release named v1.2.16


    npm i math-expression-evaluator

    DownloadsWeekly Downloads






    Unpacked Size

    64 kB

    Total Files


    Last publish


    • bugwheels94