Assigning estimates using the Card Size Power-Up (recommended)
Once you’ve installed the Card Size Power-Up, you can provide an estimate for a task by clicking on the Card Size button on the right side of the card.
![cardsize_animation_small.gif](https://images.squarespace-cdn.com/content/v1/5303cdc2e4b01fb736d82734/1558014660027-079OFW0X99NM2R2ZTLST/cardsize_animation_small.gif?format=750w)
Once you’ve entered the estimates, they become available in your custom charts in Screenful. You’ll now see the Card size option in the Unit menus in your custom charts:
![](https://framerusercontent.com/images/EN5Cw7ic0bJyzOxijIkaNkBby6c.jpg)
For example, you can use this to create a high-level overview of the card size of your tasks in progress by creating a bar chart and selecting Card size from the Unit menu:
![](https://framerusercontent.com/images/C0AlAmOk4m6CrUQYaWY7rZL3L9I.jpg)
Assigning estimates using Trello’s custom fields
You can use a Number or Dropdown type custom field for providing an estimate for a task. Learn how to set estimates using a custom field.
Screenful will automatically import your custom fields and make them available in the Unit menu.
![](https://framerusercontent.com/images/OBz5PVRgWZwGgGInOVh7J4bNaA.jpg)
Notice that if your custom field doesn’t appear in the unit menu, it means that the field is not a Number field. You need to map it to the Number field before you can use it.