The best size of granite chopping board is going to be approximately 16 inches wide, 12 inches long, and 1.5 inches deep. This shape results in the most easy handling, versatile use, and simple storage for the average user. However, you’ll want to take the specific constraints of your space into account! Make sure to measure the place that you’ll be using it most, and use those measurements as your upper limits when searching for a beautiful, useful chopping board.