Circumference of a 18 Centimeter Diameter Circle

What is the circumference of a circle with a diameter of 18 cm? How far around is a circle that is 18 centimeters across?

Diameter

meters

Units

Circumference of a 18cm diameter circle

results may be rounded

The circumference of a circle is pi times its diameter.

Circumference = π * Diameter

The diameter of a circle is the distance from one edge to the other, passing through the center. It is twice the radius.

Circle Circumference by Diameter

results may be rounded

Diameter	cm	in	ft
18.0 cm	56.55	22.26	1.855
18.1 cm	56.86	22.39	1.866
18.2 cm	57.18	22.51	1.876
18.3 cm	57.49	22.63	1.886
18.4 cm	57.81	22.76	1.896
18.5 cm	58.12	22.88	1.907
18.6 cm	58.43	23.01	1.917
18.7 cm	58.75	23.13	1.927
18.8 cm	59.06	23.25	1.938
18.9 cm	59.38	23.38	1.948
19.0 cm	59.69	23.50	1.958
19.1 cm	60.00	23.62	1.969
19.2 cm	60.32	23.75	1.979
19.3 cm	60.63	23.87	1.989
19.4 cm	60.95	23.99	2.000
19.5 cm	61.26	24.12	2.010
19.6 cm	61.58	24.24	2.020
19.7 cm	61.89	24.37	2.030
19.8 cm	62.20	24.49	2.041
19.9 cm	62.52	24.61	2.051
20.0 cm	62.83	24.74	2.061
20.1 cm	63.15	24.86	2.072
20.2 cm	63.46	24.98	2.082
20.3 cm	63.77	25.11	2.092
20.4 cm	64.09	25.23	2.103

Diameter	cm	in	ft
20.5 cm	64.40	25.36	2.113
20.6 cm	64.72	25.48	2.123
20.7 cm	65.03	25.60	2.134
20.8 cm	65.35	25.73	2.144
20.9 cm	65.66	25.85	2.154
21.0 cm	65.97	25.97	2.164
21.1 cm	66.29	26.10	2.175
21.2 cm	66.60	26.22	2.185
21.3 cm	66.92	26.34	2.195
21.4 cm	67.23	26.47	2.206
21.5 cm	67.54	26.59	2.216
21.6 cm	67.86	26.72	2.226
21.7 cm	68.17	26.84	2.237
21.8 cm	68.49	26.96	2.247
21.9 cm	68.80	27.09	2.257
22.0 cm	69.12	27.21	2.268
22.1 cm	69.43	27.33	2.278
22.2 cm	69.74	27.46	2.288
22.3 cm	70.06	27.58	2.298
22.4 cm	70.37	27.71	2.309
22.5 cm	70.69	27.83	2.319
22.6 cm	71.00	27.95	2.329
22.7 cm	71.31	28.08	2.340
22.8 cm	71.63	28.20	2.350
22.9 cm	71.94	28.32	2.360