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`v = 1/12 * pi * "h" * ( t ^2+ t * "b" + "b" ^2)`

Enter a value for all fields

The **Circular Planter Volume** calculator computes the volume (**V**) of a cylindrical or V-shaped planter based on the (t) top diameter, (b) base diameter and (h) height (see diagram).

**INSTRUCTIONS:** Choose units and enter the following:

- (
**t**) Top diameter of the circular planter - (
**b**) Base diameter of the circular planter - (
**h**) Height of planter or desired height 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 ft
^{3} - 1.25 ft
^{3 } - 2.5 ft
^{3} - 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 formula for the volume of a circular planter is as follows:

`v = 1/12⋅π⋅h⋅(t^2+t⋅b+b^2)`

This answers the following questions:

- How much soil will my planter hold?
- How much water will my 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 height (h) and top (t) that match 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 ft**: $5.99^{3})**Garden Soil (1.5 ft**: $6.49^{3})**Garden Soil (2 ft**$8.49^{3}):**Potting Mix (1.25 ft**$8.74^{3}):**Potting Mix (2.5 ft**$12.36^{3}):

The Pricing Data can be used the the Raised Planter calculator.

Other Planter Shapes

- Box (rectangular) Shaped Planter Volume
- Circular Shaped Planter Volume
- Polygon Shaped Planter Volume
- Triangular Shaped Planter Volume
- Tapered Rectangular Shaped Planter Volume
- Hexagon Shaped Planter Volume
- Octagon Shaped Planter Volume

Or just use the single calculator with all of the shapes available in one place at Planter Calculator. This includes some useful industry data like potting soil pricing from national advertisers.