# Cast to float transform function

## Introduction

The **cast to float** transform function is used to change the data type associated with a source field from `string` to `float`. 

{% hint style="info" %}
A **float** is a type of number which uses a floating point to represent a decimal or fractional value. They are typically used for very large or very small values where there are a lot of numbers after the point - for example: 5.3333 or 0.0001.
{% endhint %}

## Adding a cast to float transform

**Step 1**\
In your process flow, access settings for your map shape:

<div align="left"><figure><img src="/files/w5Pcc1RmKaEZBtmmAQzE" alt="" width="275"><figcaption></figcaption></figure></div>

**Step 2**\
Select the **add transform** button for the required mapping rule - for example:

<div align="left"><figure><img src="/files/OiM6kATKl8KOTjCu3YLW" alt="" width="375"><figcaption></figcaption></figure></div>

**Step 3**\
Click the **add transform** button:

<div align="left"><figure><img src="/files/WK4c9L3KxE8RNOrxtiQ0" alt="" width="375"><figcaption></figcaption></figure></div>

**Step 4**\
Click in the **name** field to access a list of all available transform functions, then select **cast to float** from the **string** category:

<div align="left"><figure><img src="/files/Qau7gziLrk7tL82FbeDF" alt="" width="375"><figcaption></figcaption></figure></div>

**Step 5**\
Click the **add field** button:

<div align="left"><figure><img src="/files/EVf35e1yPU3TupevxmUJ" alt="" width="375"><figcaption></figcaption></figure></div>

**Step 6**\
Click in **source fields** and select the source field to be used for this transform:

<div align="left"><figure><img src="/files/7Fm94pwpAIwFLyEKxeb1" alt="" width="375"><figcaption></figcaption></figure></div>

**Step 7**\
Accept your changes (twice).

**Step 8**\
Save the transform. You'll notice that the transform icon is updated to indicate that a transform function is present for the mapping row - for example:

<div align="left"><figure><img src="/files/2AHqLMF3hUbr0lKB3tDi" alt="" width="375"><figcaption></figcaption></figure></div>


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