Famous How Much Dirt Is Need For A Raised Garden Bed 2023. As a rule of thumb, a 4’x8’ raised bed that is 6 inches deep requires approximately 8 bags of soil while a 4’x8’ raised bed that is 12 inches deep requires approximately 16 bags of soil. She's been gardening organically for over two decades, and.

Web the amount of soil needed for a specific raised bed size varies depending on the dimensions of the garden bed and the desired soil depth. If you use feet to measure this calculator is for you. This only needs to be done once and is much easier if done before the raised bed is assembled in place.