CALCULATOR
Diameter to Radius Calculator
Find circle radius from diameter. Example: Diameter: 2 m gives 1 m. Input is full diameter. Flat Euclidean geometry; enter stated meter measurements. No material thickness, waste, structural recommendation or curved earth. Display rounding does not change calculation.
Input is full diameter. Flat Euclidean geometry; enter stated meter measurements. No material thickness, waste, structural recommendation or curved earth. Display rounding does not change calculation. Derivation: Invert diameter = 2r.
Accepted inputs: Diameter: 0.001 to 1,000 m.
How the calculation works
radius = diameter/2
Worked example
With diameter 2 m, circle radius from diameter is 1 m.
Assumptions and limits
Input is full diameter. Flat Euclidean geometry; enter stated meter measurements. No material thickness, waste, structural recommendation or curved earth. Display rounding does not change calculation. Derivation: Invert diameter = 2r.