Preheat the oven to 350 degrees.
Grate the carrots with a food processor or hand grater until you have 2 cups. Set aside.
Drain crushed pineapple and set aside.
Roughly chop nuts until you have 1 cup.
In a large bowl, or stand mixer, combine the dry ingredients: flour, baking powder, baking soda, salt, sugar and cinnamon. Mix well.
To the flour mixture, add grated carrots, drained pineapple and chopped nuts. Stir until well combined.
Grease a 9 x 13 pan or 2 round cake pans.
Fill pan(s) with cake batter.
Bake on 350 degrees for 45 minutes.