CALCULATOR
Diameter of a Circle Calculator
Find circle diameter from radius. Example: Radius: 2 m gives 4 m. Radius is half the distance across the center. Flat Euclidean geometry; enter stated meter measurements. No material thickness, waste, structural recommendation or curved earth. Display rounding does not change calculation.
Radius is half the distance across the center. Flat Euclidean geometry; enter stated meter measurements. No material thickness, waste, structural recommendation or curved earth. Display rounding does not change calculation. Derivation: A diameter comprises two collinear radii.
Accepted inputs: Radius: 0.001 to 1,000 m.
How the calculation works
diameter = 2r
Worked example
With radius 2 m, circle diameter from radius is 4 m.
Assumptions and limits
Radius is half the distance across the center. Flat Euclidean geometry; enter stated meter measurements. No material thickness, waste, structural recommendation or curved earth. Display rounding does not change calculation. Derivation: A diameter comprises two collinear radii.