Circumference Calculator
Calculate the circumference of a circle using radius, diameter, or area.
Calculate From
Visual Representation
Circumference = 2 x pi x r
Step-by-Step Calculation
Given: radius (r) = 5
Formula: C = 2 x pi x r
Calculate:
C = 2 x 3.14159... x 5 = 31.415927
Circumference
31.415927
= 10.0000 x pi
CCircumference
31.4159
rRadius
5.0000
dDiameter
10.0000
AArea
78.5398
Circumference Reference
| Radius | Circumference |
|---|---|
| 1 | 6.2832 |
| 2 | 12.5664 |
| 3 | 18.8496 |
| 4 | 25.1327 |
| 5 | 31.4159 |
| 10 | 62.8319 |
| 15 | 94.2478 |
| 20 | 125.6637 |
Circumference Formulas
From Radius
C = 2 x pi x r
From Diameter
C = pi x d
From Area
C = 2 x sqrt(pi x A)