You can estimate your card sizes using story points (specifically, Fibonacci-like numbers 1-100). There are two ways to add an estimate to a card:
- On the board, click the scale icon in the footer of the card and select the story point estimate from the list.
- From the card detail modal, click "Size" and select the story point estimate from the list.
Once an estimate has been given, the number will be displayed in the footer of the card on the board. The total of all card sizes in a column will be displayed at the top of each column.