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JavaScript - round with precision up-to n decimal places

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Created by:

Root-ssh

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In this article, we would like to show you how to round up numbers with precision in JavaScript.

Custom method example

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function ceilPrecised(number, precision) {
    var power = Math.pow(10, precision);
​
    return Math.ceil(number * power) / power;
}
​
// Examples:
​
console.log( ceilPrecised(     5  ,  0 ) ); // 5
console.log( ceilPrecised(     5. ,  0 ) ); // 5
console.log( ceilPrecised(      .5,  0 ) ); // 1
​
console.log( ceilPrecised(  1.1234,  0 ) ); // 2
console.log( ceilPrecised(  1.1234,  1 ) ); // 1.2
console.log( ceilPrecised(  1.1235,  2 ) ); // 1.13
console.log( ceilPrecised(  1.1235,  3 ) ); // 1.124
​
console.log( ceilPrecised( -1.1234,  0 ) ); // -1
console.log( ceilPrecised( -1.1234,  1 ) ); // -1.1
console.log( ceilPrecised( -1.1234,  2 ) ); // -1.12
console.log( ceilPrecised( -1.1234,  3 ) ); // -1.123
 
console.log( ceilPrecised(    1234, -1 ) ); // 1240
console.log( ceilPrecised(    1234, -2 ) ); // 1300
console.log( ceilPrecised(    1234, -3 ) ); // 2000
​
console.log( ceilPrecised(  5_000.000_001,  0 ) ); // 5001
console.log( ceilPrecised(  5_000.000_001,  6 ) ); // 5000.000001
console.log( ceilPrecised(  5_000.000_001, -3 ) ); // 6000