Plant Pot Size Calculator
Pot Size by Plant Type
Find the recommended pot size for different plant types
Pot Size by Root Ball
Calculate the right pot size when transplanting
Formula
New Pot = Root Ball Diameter + 2-4" | Volume (gal) = π × r² × depth / 231
Frequently Asked Questions
What size pot does a tomato plant need?
Tomatoes need at least a 5-gallon container (18" diameter). Larger indeterminate varieties do best in 10-15 gallon pots. The bigger the pot, the better the yield.
How do I know when to repot a plant?
Repot when roots grow out of drainage holes, the plant dries out quickly after watering, growth slows despite proper care, or you see roots circling the soil surface.
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