Today was one of those days I wish there was something "standardized" about pot sizes. One catalog uses one set of measurements, another catalog uses something else. Stores use inches, nurseries use gallons. Ahhhh...

Pot sizes - inches to gallon conversion Image

Trying to figure out pot sizes is often quite a headache. You've got some in inches, some in gallons, and yes, even some in fluid ounces; the later we're still trying to figure out. They do make this confusing, don't they? There's a theory going around that this purposely confusing system is a way for the mass market industry to charge more for plants, by container size, not necessarily Plant Size!

Pot sizes - inches to gallon conversion Image

So let's try and break down these various sizes and measurements and set some general "accepted standards" for pot sizes. Please remember these are rough estimates and not a science. Some of the larger sizes especially are prone to variances in height, width, and depth of the pot. We've also attached a photograph that we hope will help allow you to visualize the differences.

Pot Size Conversion Chart

Inches to Gallons to Liters to Cubic Feet

Pot Sizes (inches) Pot Equivalent (U.S. Gallons) International (Liters) Dry Soil Needed (Approx. cu.ft.)
4" pot pint / 0.5 quart / .125 gallon .5 L [.473] 0.01 ft3
5-6" pot quart / 0.25 gallon 1 L [.946] 0.03 ft3
7-8" pot 1 gallon 4L [3.78] 0.15 ft3
8.5" pot 2 gallon 7.5 L [7.57] 0.3 ft3
10" pot 3 gallon 11 L [11.35] 0.46 ft3
12" pot 5 gallon 15 L [15.14] 0.77 ft3
14" pot 7 gallon 19 L [18.92] 1 ft3
16" pot 10 gallon 22.5 L [22.71] 1.5 ft3
18" pot 15 gallon 26.5 L [26.49] 2.3 ft3
24" pot 25 gallon 30 L [30.28] 3.8 ft3
30" pot 30 gallon 34 L [34.06] 4.6 ft3
Download Pot Sizes Conversion Chart

Download Pot Sizes Conversion Chart

Download the chat in PDF format.

Download the PDF Chart →

Published/Updated on: 06-12-2019