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# Circle calculator, formula, explanation

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