# Calc Use Cases

## Count the Items in a Collection List

Preparation;

* Setup your Collection List
* Create the element where you want the Collection List count to appear 

Attributes; 

Choose a unique name for the items you're counting, we'll use `test1` for this example. 

On the element that will display the count;  

* Add the `wfu-calc` = `count` attribute 
* Add `wfu-calc-source` =  `test1` attribute  

On the collection list;  

* Place `wfu-calc-field` = `test1` directly on the Collection List Item element.  

{% hint style="success" %}
If you have more than 100 items to count, you can use multiple collection lists each ranged to show 100 items from your collection.  Assign the same `wfu-calc-field` = `test1` to each and they will all be counted together. 
{% endhint %}

## Sum the Values within a Collection List 

Preparation;

* Setup your Collection List
  * Within the Collection List, place your element which contains the value you are wanting to sum 
* Create the element where you want the Collection List sum to appear 

Attributes; 

Choose a unique name for the items you're counting, we'll use `test2` for this example. 

On the element that will display the count; 

* Add the `wfu-calc` = `sum` attribute 
* Add `wfu-calc-source` =  `test2` attribute  

On the element *within your collection list* that contains the value to be summed; 

* Place `wfu-calc-field` = `test2` directly on the Collection List Item element.  

{% hint style="success" %}
If you have more than 100 items to count, you can use multiple collection lists each ranged to show 100 items from your collection.  Assign the same `wfu-calc-field` = `test2` to your data within each and they will all be counted together.  
{% endhint %}