Potting mix volume calculator

Measure the inside of your container up to the intended fill level. For a tapered pot, the cylinder estimate is only approximate. Enter the bag size actually sold by your supplier, in liters for metric mode, or cubic feet for US customary mode.

Method and limitations

Rectangular volume = length × width × depth. Cylindrical volume = π × (diameter ÷ 2)² × height. Dimensions in cm give cm³; divide by 1,000 for liters. Bags = volume ÷ bag size, rounded up. For inches, the volume is converted to cubic feet (1 ft³ = 1,728 in³); enter bag size in the same unit. No settling allowance is included.