Circumference of a 21 Inch Diameter Circle
What is the circumference of a circle with a diameter of 21 in? How far around is a circle that is 21 inches across?
Diameter
cm
Diameter
ft
in
Diameter
meters
Units
Circumference of a 21″ diameter circle
| 65.973 | inches |
| 5.4978 | feet |
| 5′ 5.973″ | feet and inches |
| 1.6757 | meters |
| 167.57 | centimeters |
results may be rounded
Circumference of a Circle Formula
The circumference of a circle is pi times its diameter.
Circumference = π * Diameter
Diameter of a Circle
The diameter of a circle is the distance from one edge to the other, passing through the center. It is twice the radius.