Planter Sizes: Complete Dimensions Guide

Planter pot sizes range from small 4 inch indoor pots to large 25 gallon outdoor containers. This guide compares dimensions, gallon capacity, and soil volume for indoor, outdoor, hanging, and raised bed planters to help you choose the right size.

Standard Planter Pot Sizes

Planter pots are measured by top diameter and depth. Capacity is expressed in gallons or liters of soil volume.

Pot Size	Diameter (in / cm)	Depth (in / cm)	Capacity (gal / L)
4 inch pot	4 / 10	3.5 to 4 / 9 to 10	0.25 / 0.9
6 inch pot	6 / 15	5 to 6 / 13 to 15	0.75 / 2.8
8 inch pot	8 / 20	7 to 8 / 18 to 20	1.5 / 5.7
10 inch pot	10 / 25	9 to 10 / 23 to 25	3 / 11.4
12 inch pot	12 / 30	10 to 11 / 25 to 28	5 / 18.9
14 inch pot	14 / 36	12 to 13 / 30 to 33	7 / 26.5
16 inch pot	16 / 41	14 to 15 / 36 to 38	10 / 37.9
20 inch pot	20 / 51	16 to 18 / 41 to 46	15 / 56.8
24 inch pot	24 / 61	18 to 20 / 46 to 51	25 / 94.6

Planter Types and Recommended Sizes

Different planter types suit specific plants and locations. Size recommendations vary by plant root depth and growth habit.

Planter Type	Typical Size Range (in / cm)	Best For
Indoor Tabletop	4 to 8 / 10 to 20	Small houseplants, succulents, herbs
Indoor Floor Planter	10 to 16 / 25 to 41	Large houseplants, fiddle leaf fig, monstera
Outdoor Patio Planter	12 to 24 / 30 to 61	Flowers, vegetables, shrubs
Hanging Basket	8 to 14 / 20 to 36	Trailing plants, petunias, ferns
Window Box	24 to 48 long / 61 to 122	Flowers, herbs along windowsills
Raised Bed	48 to 96 long / 122 to 244	Vegetables, cutting gardens

Plant Type and Minimum Pot Size Requirements

Different plants need different pot depths for healthy root growth. Match pot size to plant root system depth.

Plant Category	Minimum Pot Depth (in / cm)	Minimum Diameter (in / cm)
Succulents	3 to 4 / 8 to 10	4 to 6 / 10 to 15
Herbs	6 to 8 / 15 to 20	6 to 10 / 15 to 25
Lettuce and Greens	6 to 8 / 15 to 20	8 to 12 / 20 to 30
Tomatoes	12 to 18 / 30 to 46	14 to 20 / 36 to 51
Peppers	10 to 12 / 25 to 30	12 to 16 / 30 to 41
Small Trees	18 to 24 / 46 to 61	20 to 24 / 51 to 61
Root Vegetables	12 to 18 / 30 to 46	12 to 16 / 30 to 41

Visual Size Comparison

Planter pot size comparison from small tabletop to large outdoor containers.

Planter Size Calculator

Find the right planter size for your plant type.

How to size planters for your yard

Measure the usable area, not the lot

Planter size depends on the mature plant. As a starting point: annuals and herbs need 6–10″ depth; perennials 12–16″; small shrubs and dwarf trees 18–24″; full-size potted trees 24″+ and at least 18″ wide.

Clearance from structures

Most jurisdictions require setbacks from property lines, structures, and overhead utility lines. Even where setbacks aren't legally required, allow at least 24″ from any wall or fence for maintenance access and to keep moisture from damaging both the structure and the new piece.

Anchoring and weight

Planter weight when filled: a 16″ terracotta pot weighs about 35 lb empty and 80 lb full; a 24″ ceramic pot can exceed 150 lb full. Rolling caddies prevent floor damage on patios and decks. Self-watering planters add weight but reduce watering frequency.

Common mistakes

Sizing to the lot dimensions rather than the level usable space.
Forgetting setback rules — some require permits even for things that look freestanding.
Ignoring sun and wind direction; the right size in the wrong spot becomes unusable in summer or storms.