---
title: "toDouble"
description: "Tries to coerce value into a double (64-bit floating point value)."
---

# toDouble

> Tries to coerce value into a double (64-bit floating point value).

**This function is used by Ignition's Expression language.**.

## Description
Tries to coerce value into a double (64-bit floating point value). If value is a number, the conversion is direct. If value is a string, it is parsed to see if it represents a double. If not, type casting fails.

## Syntax
`toDouble(value[, failover])`

- Parameters

    - object **value** - The value to type cast.

    - object **failover** - Optional. The failover value if type casting fails.

- Results

    - Double - The value type cast as a double.

## Examples
```python title="Code Snippet"
toDouble("38.772") //returns 38.772
```
```python title="Code Snippet"
toDouble({Root Container.TextField.text}, 0.0) //returns the value in the text box as a double, or 0.0 if the value doesn't represent an number.
```