The Hexagon Planter Volume calculator computes the volume (V) of a hexagon shaped planter based on the length of the sides (s) and (h) height (see diagram). 
INSTRUCTIONS: Choose units and enter the following:
- (s) Side Length of Hexagon
- (h) Height of planter or desired depth of soil in the planter
Volume (V): The calculator returns the volume in cubic feet. However, this can be automatically converted into other volume units via the pull-down menu next to the answer. The calculator also returns the number of soil bags of the following sizes:
- 1 ft3
- 1.25 ft3
- 2.5 ft3
- 8 quarts
- 32 quarts
- 64 quarts
IMPORTANT NOTE: To compute the amount of soil needed in the planter, use the interior dimensions of the container, and use the top diameter associated with how high you want to fill the container. If you wish to fill to the brim, it is the full inner height.
The Math / Science
The Hexagon Planter Volume calculator computes the volume of a hexagon shaped planter. Enter the length of a side of the planter (s) and the (h) height of the interior of the container (see diagram), then this formula will provide the volume of the container. This answers the following questions:
- How much soil will my hexagon planter hold?
- How much water will my hexagon container hold?
- How much potting soil do I need?
If you do not intend to fill the container to the top, this formula will over estimate unless you use a depth (d) that matches your expected top surface inside the container. Unless it's a very large container, and/or you are only using a small portion of the container, the overage should be small.
The Garden Soil Price Survey information is as follows:
- Date: 6/11/21
- Store: Multiple Sources
- Garden Soil (1 ft3): $5.99
- Garden Soil (1.5 ft3): $6.49
- Garden Soil (2 ft3): $8.49
- Potting Mix (1.25 ft3): $8.74
- Potting Mix (2.5 ft3): $12.36
The Pricing Data can be used the the Raised Planter calculator.