# Number toExponential() Method with Example in JavaScript

JavaScript Number toExponential() Method: Here, we are going to learn about the toExponential() method with example.
Submitted by IncludeHelp, on February 20, 2019

## Number toExponential() Method

toExponential() method is a method of Number class, it is used to convert a number into exponential notation format.

Syntax:

```    Number.toExponential([n]);
```

Here, n is an optional parameter, it is used to define the number of digits from 0 to 20 in the notation format.

Examples:

```    Input: 10
num = 123.456

Function call:
num.toExponential(15)

Output:
1.234560000000000e+2
```

Code:

```<html>
<title>JavaScipt Example</title>
<body>
<script>
var num = 123.456;

var exp_res1 = num.toExponential();
var exp_res2 = num.toExponential(2);
var exp_res3 = num.toExponential(15);

document.write("exp_res1 = " + exp_res1 + "<br>");
document.write("exp_res2 = " + exp_res2 + "<br>");
document.write("exp_res3 = " + exp_res3 + "<br>");

</script>
</body>
</html>
```

Output

```exp_res1 = 1.23456e+2
exp_res2 = 1.23e+2
exp_res3 = 1.234560000000000e+2
```

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