Circumference of a 40 Centimeter Diameter Circle

What is the circumference of a circle with a diameter of 40 cm? How far around is a circle that is 40 centimeters across?

Diameter

meters

Units

Circumference of a 40cm 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
40.0 cm	125.7	49.47	4.123
40.1 cm	126.0	49.60	4.133
40.2 cm	126.3	49.72	4.143
40.3 cm	126.6	49.84	4.154
40.4 cm	126.9	49.97	4.164
40.5 cm	127.2	50.09	4.174
40.6 cm	127.5	50.22	4.185
40.7 cm	127.9	50.34	4.195
40.8 cm	128.2	50.46	4.205
40.9 cm	128.5	50.59	4.216
41.0 cm	128.8	50.71	4.226
41.1 cm	129.1	50.83	4.236
41.2 cm	129.4	50.96	4.247
41.3 cm	129.7	51.08	4.257
41.4 cm	130.1	51.21	4.267
41.5 cm	130.4	51.33	4.277
41.6 cm	130.7	51.45	4.288
41.7 cm	131.0	51.58	4.298
41.8 cm	131.3	51.70	4.308
41.9 cm	131.6	51.82	4.319
42.0 cm	131.9	51.95	4.329
42.1 cm	132.3	52.07	4.339
42.2 cm	132.6	52.19	4.350
42.3 cm	132.9	52.32	4.360
42.4 cm	133.2	52.44	4.370

Diameter	cm	in	ft
42.5 cm	133.5	52.57	4.381
42.6 cm	133.8	52.69	4.391
42.7 cm	134.1	52.81	4.401
42.8 cm	134.5	52.94	4.411
42.9 cm	134.8	53.06	4.422
43.0 cm	135.1	53.18	4.432
43.1 cm	135.4	53.31	4.442
43.2 cm	135.7	53.43	4.453
43.3 cm	136.0	53.56	4.463
43.4 cm	136.3	53.68	4.473
43.5 cm	136.7	53.80	4.484
43.6 cm	137.0	53.93	4.494
43.7 cm	137.3	54.05	4.504
43.8 cm	137.6	54.17	4.514
43.9 cm	137.9	54.30	4.525
44.0 cm	138.2	54.42	4.535
44.1 cm	138.5	54.54	4.545
44.2 cm	138.9	54.67	4.556
44.3 cm	139.2	54.79	4.566
44.4 cm	139.5	54.92	4.576
44.5 cm	139.8	55.04	4.587
44.6 cm	140.1	55.16	4.597
44.7 cm	140.4	55.29	4.607
44.8 cm	140.7	55.41	4.618
44.9 cm	141.1	55.53	4.628