How to Convert a Float Number to a Whole Number in JavaScript

Use the JavaScript trunc() Method

You can use the trunc() method to get the integer part of a number by removing any fractional digits. This method was added in ECMAScript 6 and supported by the latest browsers such as Chrome, Firefox, Safari, Opera, and Edge browsers. Not supported in Internet Explorer.

Alternatively, you can also try other methods like floor(), ceil() and round() to round a number. Let's take a look at the following example to understand how it works:

<script>
console.log(Math.trunc(3.5));    // Prints: 3
console.log(Math.trunc(-5.7));   // Prints: -5
console.log(Math.trunc(0.123));  // Prints: 0
console.log(Math.trunc(-1.123)); // Prints: -1
    
console.log(Math.ceil(3.5));     // Prints: 4
console.log(Math.ceil(-5.7));    // Prints: -5
console.log(Math.ceil(9.99));    // Prints: 10
console.log(Math.ceil(-9.99));   // Prints: -9
    
console.log(Math.floor(3.5));    // Prints: 3
console.log(Math.floor(-5.7));   // Prints: -6
console.log(Math.floor(9.99));   // Prints: 9
console.log(Math.floor(-9.99));  // Prints: -10
    
console.log(Math.round(3.5));    // Prints: 4
console.log(Math.round(-5.7));   // Prints: -6
console.log(Math.round(7.25));   // Prints: 7
console.log(Math.round(4.49));   // Prints: 4
</script>