# Circumference of a Circle Calculator

### Inputs:

 Radius (r): or Diameter (d): or Area (A): Unit of Lenght: inch foot yard mile millimeter centimeter meter kilometer

### Result:

The circumference of a circle with radius 5 is 31.42(*)

### Formulas:

 Image of Circle r = 5 d = 10 C = 31.4 C = 2·π·r C = π·d C = √4·π·A π = 3.1415 A = area of the circle C = circumference or perimeter r = radius, d = diameter

### Circumference of a cicle in terms of radius:

Circumference = 2·π·r = 2·3.14·5 = 31.42(*)

### In terms of diameter:

Circumference = π·d = 3.14·10 = 31.4(*)

### In terms of area:

Circumference C = √4·π·A = √4·π·78.54 = 31.42(*)

(*) 31.42 meters exactly or limited to de precision of this calculator (13 decimal places).

Note: for simplicity, the operations above were rounded to 2 decimal places and π was rounded to 3.14.

Use the this circumference length calculator above to find the perimeter of a circle given its radius, or other parameters.

## Formula to calculate the circumference of a circle

Here a three ways to find the circumference or perimeter of a circle:

C = 2·π·r

C = π·d

C = √4·π·A

### Questions this calculator can answer:

• How to find the perimeter of a circle with a radius of 5 meters?
• A circle has a diameter of 10 meters. What is its circumference?
• If a circle has a area of 78.54 square meters. What is its perimeter?

## Relation between radius, diameter, area and circumference of a circle

Note: All values are rounded to two decimal places.

0.10.20.030.63
0.150.30.070.94
0.20.40.131.26
0.250.50.21.57
0.30.60.281.88
0.350.70.382.2
0.40.80.52.51
0.450.90.642.83
0.510.793.14
0.551.10.953.46
0.61.21.133.77
0.651.31.334.08
0.71.41.544.4
0.751.51.774.71
0.81.62.015.03
0.851.72.275.34
0.91.82.545.65
0.951.92.835.97
123.146.28
1.012.023.26.35
1.022.043.276.41
1.032.063.336.47
1.042.083.46.53
1.052.13.466.6
1.062.123.536.66
1.072.143.596.72
1.082.163.666.79
1.092.183.736.85
1.12.23.86.91
1.102.23.86.91
1.112.223.876.97
1.122.243.947.04
1.132.264.017.1
1.142.284.087.16
1.152.34.157.23
1.162.324.237.29
1.172.344.37.35
1.182.364.377.41
1.192.384.457.48
1.22.44.527.54
1.202.44.527.54
1.212.424.67.6
1.222.444.677.67
1.232.464.757.73
1.242.484.837.79
1.252.54.917.85
1.262.524.997.92
1.272.545.067.98
1.282.565.148.04
1.292.585.238.11
1.32.65.318.17
1.302.65.318.17
1.312.625.398.23
1.322.645.478.29
1.332.665.558.36
1.342.685.648.42
1.352.75.728.48
1.362.725.818.54
1.372.745.898.61
1.382.765.988.67
1.392.786.078.73
1.42.86.158.8
1.402.86.158.8
1.412.826.248.86
1.422.846.338.92
1.432.866.428.98
1.442.886.519.05
1.452.96.69.11
1.462.926.699.17
1.472.946.799.24
1.482.966.889.3
1.492.986.979.36
1.537.079.42
1.5037.079.42
1.513.027.169.49
1.523.047.259.55
1.533.067.359.61
1.543.087.459.68
1.553.17.549.74
1.563.127.649.8
1.573.147.749.86
1.583.167.849.93
1.593.187.949.99
1.63.28.0410.05
1.603.28.0410.05
1.613.228.1410.12
1.623.248.2410.18
1.633.268.3410.24
1.643.288.4510.3
1.653.38.5510.37
1.663.328.6510.43
1.673.348.7610.49
1.683.368.8610.56
1.693.388.9710.62
1.73.49.0710.68
1.703.49.0710.68
1.713.429.1810.74
1.723.449.2910.81
1.733.469.410.87
1.743.489.5110.93
1.753.59.6211
1.763.529.7311.06
1.773.549.8411.12
1.783.569.9511.18
1.793.5810.0611.25
1.83.610.1711.31
1.803.610.1711.31
1.813.6210.2911.37
1.823.6410.411.44
1.833.6610.5211.5
1.843.6810.6311.56
1.853.710.7511.62
1.863.7210.8611.69
1.873.7410.9811.75
1.883.7611.111.81
1.893.7811.2211.87
1.93.811.3411.94
1.903.811.3411.94
1.913.8211.4612
1.923.8411.5812.06
1.933.8611.712.13
1.943.8811.8212.19
1.953.911.9412.25
1.963.9212.0612.31
1.973.9412.1912.38
1.983.9612.3112.44
1.993.9812.4312.5
2412.5612.57
2.00412.5612.57
2.014.0212.6912.63
2.024.0412.8112.69
2.034.0612.9412.75
2.044.0813.0712.82
2.054.113.212.88
2.064.1213.3212.94
2.074.1413.4513.01
2.084.1613.5813.07
2.094.1813.7213.13
2.14.213.8513.19
2.104.213.8513.19
2.114.2213.9813.26
2.124.2414.1113.32
2.134.2614.2513.38
2.144.2814.3813.45
2.154.314.5113.51
2.164.3214.6513.57
2.174.3414.7913.63
2.184.3614.9213.7
2.194.3815.0613.76
2.24.415.213.82
2.204.415.213.82
2.214.4215.3413.89
2.224.4415.4813.95
2.234.4615.6114.01
2.244.4815.7614.07
2.254.515.914.14
2.264.5216.0414.2
2.274.5416.1814.26
2.284.5616.3214.33
2.294.5816.4714.39
2.34.616.6114.45
2.304.616.6114.45
2.314.6216.7614.51
2.324.6416.914.58
2.334.6617.0514.64
2.344.6817.1914.7
2.354.717.3414.77
2.364.7217.4914.83
2.374.7417.6414.89
2.384.7617.7914.95
2.394.7817.9415.02
2.44.818.0915.08
2.404.818.0915.08
2.414.8218.2415.14
2.424.8418.3915.2
2.434.8618.5415.27
2.444.8818.6915.33
2.454.918.8515.39
2.464.921915.46
2.474.9419.1615.52
2.484.9619.3115.58
2.494.9819.4715.64
2.5519.6315.71
2.50519.6315.71
2.515.0219.7815.77
2.525.0419.9415.83
2.535.0620.115.9
2.545.0820.2615.96
2.555.120.4216.02
2.565.1220.5816.08
2.575.1420.7416.15
2.585.1620.916.21
2.595.1821.0616.27
2.65.221.2316.34
2.605.221.2316.34
2.615.2221.3916.4
2.625.2421.5516.46
2.635.2621.7216.52
2.645.2821.8816.59
2.655.322.0516.65
2.665.3222.2216.71
2.675.3422.3816.78
2.685.3622.5516.84
2.695.3822.7216.9
2.75.422.8916.96
2.705.422.8916.96
2.715.4223.0617.03
2.725.4423.2317.09
2.735.4623.417.15
2.745.4823.5717.22
2.755.523.7517.28
2.765.5223.9217.34
2.775.5424.0917.4
2.785.5624.2717.47
2.795.5824.4417.53
2.85.624.6217.59
2.805.624.6217.59
2.815.6224.7917.66
2.825.6424.9717.72
2.835.6625.1517.78
2.845.6825.3317.84
2.855.725.517.91
2.865.7225.6817.97
2.875.7425.8618.03
2.885.7626.0418.1
2.895.7826.2318.16
2.95.826.4118.22
2.905.826.4118.22
2.915.8226.5918.28
2.925.8426.7718.35
2.935.8626.9618.41
2.945.8827.1418.47
2.955.927.3318.53
2.965.9227.5118.6
2.975.9427.718.66
2.985.9627.8818.72
2.995.9828.0718.79
3628.2618.85
3.00628.2618.85
3.016.0228.4518.91
3.026.0428.6418.97
3.036.0628.8319.04
3.046.0829.0219.1
3.056.129.2119.16
3.066.1229.419.23
3.076.1429.5919.29
3.086.1629.7919.35
3.096.1829.9819.41
3.16.230.1819.48

### Disclaimer

While every effort is made to ensure the accuracy of the information provided on this website, neither this website nor its authors are responsible for any errors or omissions. Therefore, the contents of this site are not suitable for any use involving risk to health, finances or property.