Authoritative Source & Methodology

This calculator determines mulch volume using standard geometric formulas. Recommended application depths (typically 2-4 inches) are based on horticultural best practices provided by leading agricultural extension programs.

The Formulas Explained

The calculator first determines the total area of your landscaping bed and then multiplies it by the desired depth to find the total volume.

1. Area Calculation

For Rectangular Beds:

For Circular Beds:

The radius (r) is half of the diameter.

2. Volume Calculation

To find the volume, the area must be multiplied by the depth, ensuring all units are converted to be consistent (e.g., square feet times feet).

Imperial Units (Result in Cubic Feet):

Metric Units (Result in Cubic Meters):

\text{Area}_{\text{rect}} = \text{Length} \times \text{Width}

\text{Area}_{\text{circ}} = \pi \times r^2 = \pi \times \left( \frac{\text{Diameter}}{2} \right)^2

\text{Volume (cu ft)} = \text{Area (sq ft)} \times \left( \frac{\text{Depth (in)}}{12} \right)

$ \text{Area}_{\text{rect}} = \text{Length} \times \text{Width} $

$ \text{Area}_{\text{circ}} = \pi \times r^2 = \pi \times \left( \frac{\text{Diameter}}{2} \right)^2 $

$ \text{Volume (cu ft)} = \text{Area (sq ft)} \times \left( \frac{\text{Depth (in)}}{12} \right) $

$ \text{Volume (cu m)} = \text{Area (sq m)} \times \left( \frac{\text{Depth (cm)}}{