# Fields

Custom fields, calculations, and element query customization.

##### [Write your own parsing logic for the Calculations field](/guides/fields/write-your-own-parsing-logic-for-the-calculations-field)

The Calculations field is a powerful field type, allowing you to take other fields' content and combine them in a number of different ways. But, you can also provide your own logic for how to handle values!

##### [How to modify Element field's queries to change what elements can be chosen](/guides/fields/how-to-modify-element-field-queries)

Entries, Categories, Products, Users (i.e. Element) fields all provide a list of elements for the user to select from on the front-end. Walk through how we can modify which elements are shown with advanced querying.

##### [Creating your own custom field from scratch (Formie 2)](/guides/fields/creating-your-own-custom-field-from-scratch)

Despite Formie's 30+ fields, there's always room for more! This guide will take you from start to finish creating your own custom field.