Most potted plants are in pots shaped as hemispheres or cylinders. Determining the volume of a hemisphere allows a grower to calculate the amount of soil the pot will hold. The basic calculation for volume of a hemisphere is two-thirds times pi times the radius cubed, while the formula for cylinder volume is pi times the radius squared times the height.

- Skill level:
- Easy

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### Things you need

- Tape measure

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## Instructions

- 1
Measure the radius of the pot. The radius of a hemisphere is from the bottom of the pot to the top of the pot. For example, a pot has a radius of 2 feet.

- 2
Cube the radius of the pot. In the example, 2 cubed is 2 times 2 times 2, which equals 8.

- 3
Multiply the radius cubed by pi. Pi equals approximately 3.14. In the example, 8 times 3.14 equals 25.12.

- 4
Multiply the number calculated in Step 3 by two-thirds. In the example, 2/3 times 25.12 equals approximately 16.75 cubic feet.

## Volume of a Hemisphere

- 1
Measure across the base of the pot. For example, the pot's base is 6 inches.

- 2
Measure the height of the pot from top to bottom. In this example, the pot's height is 11 inches.

- 3
Divide the base in half to calculate the radius of the pot. In the example, 6 inches divided by 2 equals a radius of 3 inches.

- 4
Square the radius by multiplying the number by itself. In the example, 3 inches times 3 inches equals 9 square inches.

- 5
Multiply the radius squared by the height and pi to calculate volume of the pot. Estimate pi as 3.14. In the example, 9 times 11 times 3.14 equals a volume of 310.86 cubic inches.