How big is a circle with a width of 21 feet?

How big of an area is a circle with a diameter of 21 feet? Enter the dimensions in feet and inches and the calculator will show the area in square feet, meters, inches, and acres.

Calculate the area of a rectangle

Input the diameter
Feet
Inches

Area

Use this to calculate the area of a circle with a width of 21 feet. Type in the diameter and it will show the area. Use it to calculate the area of a lake, cul de sac, mirror, rug, patio, swimming pool, island, or any circular area.

Square Feet Chart

Width (Diameter) Square Footage
21'0 346.36 sq ft
21'1 349.11 sq ft
21'2 351.88 sq ft
Width (Diameter) Square Footage
21'3 354.66 sq ft
21'4 357.44 sq ft
21'5 360.24 sq ft
Width (Diameter) Square Footage
21'6 363.05 sq ft
21'7 365.87 sq ft
21'8 368.70 sq ft
Width (Diameter) Square Footage
21'9 371.54 sq ft
21'10 374.39 sq ft
21'11 377.26 sq ft