1 circular inch | 0.005454 ft^2 (square feet) | 0.7854 in^2 (square inches) | 5.067 cm^2 (square centimeters) | 506.7 mm^2 (square millimeters) | 5.067×10^-4 m^2 (square meters)

1 ft^2 | 183.3 circular inches 1 in^2 | 1.273 circular inches 1 cm^2 | 0.1974 circular inches 1 mm^2 | 0.001974 circular inches 1 m^2 | 1974 circular inches

area

UK imperial | UK circular

[length]^2

Radius r of a circle from A = πr^2: | 0.5 inches | 13 mm (millimeters)

Radius r of a sphere from A = 4πr^2: | 0.25 inches | 6.4 mm (millimeters)

Edge length a of a square from A = a^2: | 0.8862 inches | 22.51 mm (millimeters)

≈ ( 0.045 ≈ 1/22 ) × area of one side of a compact disc ( 0.01131 m^2 )

≈ 0.46 × area of a human retina ( ≈ 0.0011 m^2 )

≈ area of a typical postage stamp ( ≈ 5 cm^2 )