Use math round() method with arithmetic logic to get round to 1 decimal of given number in JavaScript.
Math.round(num * 10) / 10You can also use the toFixed() function.
var num = 2;
var roundedString = num.toFixed(2);// 2.00Example round to 1 decimal in JavaScript
Simple example code.
<!doctype html>
<head>
<script>
var number = 12.3456789
var rounded = Math.round(number * 10) / 10
console.log(rounded)
</script>
</head>
<body>
</body>
</html>
Output:
if you want it to have one decimal place, even when that would be a 0, then add this
var fixed = rounded.toFixed(1)
// fixed is always to 1 d.p.
// NOTE: .toFixed() returns a string!
// To convert back to number format
parseFloat(number.toFixed(2))
// 12.34
// but that will not retain any trailing zerosSource: stackoverflow.com
Do comment if you have any doubts or suggestions on this JS round code.
Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version