The javaScript round method is used to rounds a number to the nearest integer. It can do round up or round down a number. You have to just pass the number as a parameter into the method.
Syntax
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Math.round(<em>x</em>) |
Examples of the JavaScript round method
Let’s do round a number to the nearest integer in js:-
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<!DOCTYPE html> <html> <body> <script language="JavaScript"> var num = 98.33668; var n = Math.round(num); alert(n); </script> </body> </html> |
Output:
Round up
Simply automatic will round up integer (number). If the first decimal above and equal the 5.
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Math.ceil(1.4) |
ceil() Method also Round a number upward to its nearest integer:
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var num = 98.33; var n = Math.ceil(num) |
Round down
Same as round up not need specials instructions. If first decimal is below 5.
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<script language="JavaScript"> var num = 98.15; var n = Math.round(num) alert(n); </script> |
floor() Method also can use to Round a number downward to its nearest integer:
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Round a number downward to its nearest integer: |
Round to 2 decimals
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Math.round(num * 100) / 100 |
Round to 1 decimal
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Math.round(num * 10) / 10 |
Round to nearest 10
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var number = 33; console.log(Math.round(number / 10) * 10); |
Round to 4 decimal places
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myNumber.toFixed(4); |
Q: How to JavaScript round float?
Answer: Use toFixed() function.
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(6.688689).toFixed(); // equal to 7 (6.688689).toFixed(1); // equal to 6.7 (6.688689).toFixed(2); // equal to 6.69 |
Read more: JavaScript toFixed() method
Do comment if you have any doubts and suggestion on topic.
Note: 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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