Estimate how much soil a round container pot holds.
Treating a round pot as a cylinder gives its volume in cubic inches, then converting to gallons and quarts sizes the soil order. Mixing soil in the right volume fills a container without waste, and container crops depend on enough root volume to thrive.
Container Potting Volume
Gallons = cylindrical cubic inches ÷ 231
Gallons = cylindrical cubic inches ÷ 231 Treating a round pot as a cylinder gives its volume in cubic inches, then converting to gallons and quarts sizes the soil order.
Mixing soil in the right volume fills a container without waste, and container crops depend on enough root volume to thrive.
This calculator takes 2 inputs: Pot diameter, Pot depth. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.