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JavaScript number precision | Example code

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Use the toPrecision() method to format a number to a specific precision or length in Javascript. This method returns a string representing the Number object to the specified precision.


A decimal point and nulls are added (if needed), to create the specified length.

JavaScript number precision

Simple example code format a number to a specified length:

<!DOCTYPE html>
    let num = 11.3714;


JavaScript number precision

More examples

function precise(x) {
  return x.toPrecision(4);

console.log(precise(123.456)); // "123.5"

console.log(precise(0.004)); // "0.004000"

console.log(precise(1.23e5)); // "1.230e+5"

Do comment if you have any doubts or suggestions on this Js number topic.

Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.

OS: Windows 10

Code: HTML 5 Version

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