How much dirt do one need to fill a 16x4x12 raised bed?

To fill a raised bed measuring 16 feet long, 4 feet wide, and 12 inches (1 foot) deep, you need to calculate the volume in cubic feet. The volume is given by the formula: length × width × depth. So, 16 × 4 × 1 = 64 cubic feet of dirt is required to fill the raised bed.