How to Calculate the Square Footage of a Circle
The area of a circle is calculated using the formula A = pi x r². To find the square footage, convert the radius (or half the diameter) to feet, then apply the formula.
Circle Area Formulas
From Radius
The most common formula using the radius.
A = pi x r²
From Diameter
Using diameter instead of radius.
A = pi x (d/2)²
Circumference
The distance around the circle.
C = 2 x pi x r
Common Uses
- Calculating patio or deck area for circular designs.
- Estimating material for circular garden beds or planters.
- Determining coverage for round pools, fountains, or fire pits.
- Planning paint or flooring for circular rooms or areas.
- Calculating the area of circular driveways or turnarounds.
Conversion Reference
1 foot = 12 inches, 1 yard = 3 feet, 1 meter = 3.28084 feet. Always ensure your radius or diameter is converted to feet before calculating for square footage results.