How to Calculate the Cubic Feet of a Circle

By Shauna Heathman; Updated April 24, 2017
Calculate the cubic feet of a circle.

Calculating the cubic feet of a circle requires a few more steps than calculating the cubic feet of a square or rectangle. However, with a simple formula, the cubic footage is easy to discover. The most important part is making the necessary measurements accurately.

Measure the radius of the circle in feet. To do this, measure the diameter of the circle and divide by two. This number is the radius measurement.

Measure the depth of the circle in feet with the tape measure.

Using a calculator, square the radius measurement.

Multiply the squared radius by pi, or 3.14.

Take the number you calculated in Step 4 and multiply it by the depth measurement. This gives you the cubic feet of the circle.

About the Author

Shauna Heathman is a certified image consultant with a passion for writing, and has been writing since 2006. She has maintained a blog of her own for three years in which she writes on topics concerning self development, appearance, style, etiquette and communications. Heathman has a bachelor's degree in communication studies and an entrepreneurship certificate from the University of Iowa.