Circles Conversion

Protractors are often used to measure angle

The circle is a unit used to measure angle. Use one of the conversion calculators below to convert to another unit of measure, or read on to learn more about circles.

Circle Conversion Calculators

Choose a unit of angle to convert to.

Convert circles to radians
1 circle is equal to 6.283185 radians
Convert circles to milliradians
1 circle is equal to 6,283 milliradians
Convert circles to degrees
1 circle is equal to 360 degrees
Convert circles to minutes of arc
1 circle is equal to 21,600 minutes of arc
Convert circles to seconds of arc
1 circle is equal to 1,296,000 seconds of arc
Convert circles to gradians
1 circle is equal to 400 gradians
Convert circles to revolutions
1 circle is equal to 1 revolution
Convert circles to mils (NATO)
1 circle is equal to 6,400 mils (NATO)

Circle Definition and Usage

A circle is the equivalent of 1 revolution around a circle, or 360°.

A circle is sometimes also referred to as a revolution. Circles can be abbreviated as cir, for example 1 circle can be written as 1 cir.

Circles Measurement Conversion Table

Common circle values and equivalent imperial and metric angle measurements
circles radians milliradians degrees minutes of arc seconds of arc gradians revolutions mils (NATO)
1 cir 6.283185 rad 6,283 mrad 360° 21,600' 1,296,000" 400g 1 r 6,400 mil
2 cir 12.566371 rad 12,566 mrad 720° 43,200' 2,592,000" 800g 2 r 12,800 mil
3 cir 18.849556 rad 18,850 mrad 1,080° 64,800' 3,888,000" 1,200g 3 r 19,200 mil
4 cir 25.132741 rad 25,133 mrad 1,440° 86,400' 5,184,000" 1,600g 4 r 25,600 mil
5 cir 31.415927 rad 31,416 mrad 1,800° 108,000' 6,480,000" 2,000g 5 r 32,000 mil
6 cir 37.699112 rad 37,699 mrad 2,160° 129,600' 7,776,000" 2,400g 6 r 38,400 mil
7 cir 43.982297 rad 43,982 mrad 2,520° 151,200' 9,072,000" 2,800g 7 r 44,800 mil
8 cir 50.265482 rad 50,265 mrad 2,880° 172,800' 10,368,000" 3,200g 8 r 51,200 mil
9 cir 56.548668 rad 56,549 mrad 3,240° 194,400' 11,664,000" 3,600g 9 r 57,600 mil
10 cir 62.831853 rad 62,832 mrad 3,600° 216,000' 12,960,000" 4,000g 10 r 64,000 mil
11 cir 69.115038 rad 69,115 mrad 3,960° 237,600' 14,256,000" 4,400g 11 r 70,400 mil
12 cir 75.398224 rad 75,398 mrad 4,320° 259,200' 15,552,000" 4,800g 12 r 76,800 mil
13 cir 81.681409 rad 81,681 mrad 4,680° 280,800' 16,848,000" 5,200g 13 r 83,200 mil
14 cir 87.964594 rad 87,965 mrad 5,040° 302,400' 18,144,000" 5,600g 14 r 89,600 mil
15 cir 94.24778 rad 94,248 mrad 5,400° 324,000' 19,440,000" 6,000g 15 r 96,000 mil
16 cir 100.530965 rad 100,531 mrad 5,760° 345,600' 20,736,000" 6,400g 16 r 102,400 mil
17 cir 106.81415 rad 106,814 mrad 6,120° 367,200' 22,032,000" 6,800g 17 r 108,800 mil
18 cir 113.097336 rad 113,097 mrad 6,480° 388,800' 23,328,000" 7,200g 18 r 115,200 mil
19 cir 119.380521 rad 119,381 mrad 6,840° 410,400' 24,624,000" 7,600g 19 r 121,600 mil
20 cir 125.663706 rad 125,664 mrad 7,200° 432,000' 25,920,000" 8,000g 20 r 128,000 mil