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Please enter only one value below to calculate the other values.
Radius (R) :
Diameter (D) :
Circumference (C) :
Area (A):
Result and formula:
Radius (R) = 1
Diameter (D) = 2 R = 2
Circumference (C) = 2 ϖ R = 6.2832
Area (A) = ϖ R 2 = 3.1416

Circumference (perimeter) of a circle, when radius has various values

0.5 3.1416
1 6.2832
1.5 9.4248
2 12.566
2.5 15.708
3 18.85
3.5 21.991
4 25.133
4.5 28.274
5 31.416
5.5 34.558
6 37.699
6.5 40.841
7 43.982
7.5 47.124
8 50.265
8.5 53.407
9 56.549
9.5 59.69
10 62.832
10.5 65.973
11 69.115
11.5 72.257
12 75.398
12.5 78.54
13 81.681
13.5 84.823
14 87.965
14.5 91.106
15 94.248
15.5 97.389
16 100.53
16.5 103.67
17 106.81
17.5 109.96
18 113.1
18.5 116.24
19 119.38
19.5 122.52
20 125.66
21 131.95
22 138.23
23 144.51
24 150.8
25 157.08
26 163.36
27 169.65
28 175.93
29 182.21
30 188.5
31 194.78
32 201.06
33 207.35
34 213.63
35 219.91
36 226.19
37 232.48
38 238.76
39 245.04
40 251.33
41 257.61
42 263.89
43 270.18
44 276.46
45 282.74
46 289.03
47 295.31
48 301.59
49 307.88
50 314.16
55 345.58
60 376.99
65 408.41
70 439.82
75 471.24
80 502.65
85 534.07
90 565.49
95 596.9
100 628.32

Area of a circle, when radius has various values

0.5 0.7854
1 3.1416
1.5 7.0686
2 12.566
2.5 19.635
3 28.274
3.5 38.485
4 50.265
4.5 63.617
5 78.54
5.5 95.033
6 113.1
6.5 132.73
7 153.94
7.5 176.71
8 201.06
8.5 226.98
9 254.47
9.5 283.53
10 314.16
10.5 346.36
11 380.13
11.5 415.48
12 452.39
12.5 490.87
13 530.93
13.5 572.56
14 615.75
14.5 660.52
15 706.86
15.5 754.77
16 804.25
16.5 855.3
17 907.92
17.5 962.11
18 1017.9
18.5 1075.2
19 1134.1
19.5 1194.6
20 1256.6
21 1385.4
22 1520.5
23 1661.9
24 1809.6
25 1963.5
26 2123.7
27 2290.2
28 2463
29 2642.1
30 2827.4
31 3019.1
32 3217
33 3421.2
34 3631.7
35 3848.5
36 4071.5
37 4300.8
38 4536.5
39 4778.4
40 5026.5
41 5281
42 5541.8
43 5808.8
44 6082.1
45 6361.7
46 6647.6
47 6939.8
48 7238.2
49 7543
50 7854
55 9503.3
60 11310
65 13273
70 15394
75 17671
80 20106
85 22698
90 25447
95 28353
100 31416
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