For the front joined 4X4 whole squares, then 2 half-squares on the side with 2 whole square in the centre, next row was 2 half-squares on the sides and 1 whole square in the centre, followed by only 2 rows of 1square each.
Each square was 2 1/2". The total length was 18". So, as per the size required, you can choose the no. of squares you need, while in the site, you will note that the back is not done in squares.
https://www.garnstudio.com/