Circle
Calculator
Calculate circle properties — radius, diameter, circumference, and area — from any single known value, with arc length and sector area.
Solve From
Arc Angle
deg
Circle Properties
Radius
5
Diameter
10
Circumference
31.4159
Area
78.5398
Formulas
d = 2r
C = 2πr
A = πr²
Arc = (θ/360) × 2πr
Sector = (θ/360) × πr²
Arc & Sector
Arc Length
7.854
Sector Area
19.635