# parse Float

Turn text that has just number characters into a floating point number value.

`parseFloat("0.5");`

You can change a text string having number characters into an actual floating point value. The text needs to have only number characters. This can also include the `'-'`

and the `'.'`

symbols though.

If the text has other characters, like `"-5.8g5u7"`

, only `-5.8`

is returned since it is the best
attempt at converting to a number. So, try not to mix number characters with letters or other symbols.

**Powers of 10**

If the text string has the letter **‘e’** after the number characters and then some more number characters like **“2e4”**, then the number characters after the **‘e’** are an *exponent* of **10**. This means that a string with `"7.5e2"`

becomes the value of `750`

when converted to a floating point number. This is because the `2`

after the `e`

is 2 powers of ten which is `10 * 10`

or `100`

. The resulting value then is `7.5 * 100`

which equals `750`

.

## Returns

- a floating point number value for the text number in the string.

## Example

Take the first few digits of PI from the sentence and turn it into a number.

```
let text = "pi is 3.14...";
let pi = parseFloat(text.substr(6, 3));
```

## See also

parse int