This calculates 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. 
Regular HexagonThis 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.
Standard Units
A quick survey of Home Depot's and Lowe's web sites show that potting soil usually comes in a few standard size bags:
- 1 ft3
- 1.25 ft3
- 2.5 ft3
- 8 quarts
- 32 quarts
- 64 quarts
To get your answer in the number of bags needed, click the UNITS button labelled SYSTEM and select the bag size you wish. vCalc will convert your answer from standard volume units (e.g. cubic feet) to the number of bags of that size.