Plant Pot Volume Calculator - Free Planter Capacity Tool | ConvertersLab

Plant Pot Volume Calculator

Calculate exact pot volume for perfect plant growth. Determine soil capacity in gallons, liters, and cubic feet. Get accurate results for any container size with our free easy gardening calculator.

Calculate Pot Volume

Standard Plant Pot Sizes

Pot Size Diameter Height Gallons Liters Cubic Feet
1 Gallon 6.5 inches 6.5 inches 1 gal 3.8 L 0.13 cu ft
2 Gallon 8.5 inches 7.5 inches 2 gal 7.6 L 0.27 cu ft
3 Gallon 10 inches 9 inches 3 gal 11.4 L 0.40 cu ft
5 Gallon 12 inches 10 inches 5 gal 18.9 L 0.67 cu ft
7 Gallon 14 inches 11 inches 7 gal 26.5 L 0.94 cu ft
10 Gallon 16 inches 13 inches 10 gal 37.9 L 1.34 cu ft
15 Gallon 18 inches 15 inches 15 gal 56.8 L 2.00 cu ft
20 Gallon 22 inches 17 inches 20 gal 75.7 L 2.67 cu ft
25 Gallon 24 inches 18 inches 25 gal 94.6 L 3.34 cu ft
30 Gallon 26 inches 20 inches 30 gal 113.6 L 4.01 cu ft

Plant Pot Volume Formulas

Round Pot (Cylindrical) Formula

Volume = π × (diameter ÷ 2)² × height

Where:

  • π (pi) = 3.14159
  • Diameter = width across top of pot
  • Radius = diameter divided by 2
  • Height = depth from bottom to rim

Example: A pot with 12 inch diameter and 10 inch height:

Volume = 3.14159 × (12 ÷ 2)² × 10 = 1,130.97 cubic inches

Convert to gallons: 1,130.97 ÷ 231 = 4.90 gallons

Square Pot (Rectangular) Formula

Volume = length × width × height

Where:

  • Length = longest side of pot
  • Width = shortest side of pot
  • Height = depth from bottom to rim

Example: A pot with 10 inch length, 10 inch width, and 8 inch height:

Volume = 10 × 10 × 8 = 800 cubic inches

Convert to gallons: 800 ÷ 231 = 3.46 gallons

Tapered Pot Formula (Approximate)

Volume = π × height × (r₁² + r₁×r₂ + r₂²) ÷ 3

Where:

  • r₁ = top radius (diameter ÷ 2)
  • r₂ = bottom radius
  • Height = pot depth

Soil Volume Conversion Formulas

1 Gallon = 3.78541 Liters = 0.133681 Cubic Feet = 231 Cubic Inches
1 Liter = 0.264172 Gallons = 0.0353147 Cubic Feet = 61.024 Cubic Inches
1 Cubic Foot = 7.48052 Gallons = 28.3168 Liters = 1,728 Cubic Inches
Actual Soil Volume = Pot Volume × 0.80 (leave 20% for watering space)

Disclaimer: This plant pot volume calculator provides estimates based on standard formulas. Actual pot capacity may vary due to taper, shape, and manufacturing differences. Nursery pot sizes use trade gallon measurements which differ from liquid gallons. For precise measurements, verify with water measurement method. This tool is for informational purposes only. Always check manufacturer specifications when available.

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