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Diameter to Radius of Circle Calculator


Calculate Radius of Circle
Diameter (ø) [?]
Radius (r) [?]

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✕ clear settings

Switch tool with the current settings for diameter, and calculate circle area, circle circumference, sphere volume or sphere surface area instead


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Contents

  • Related Tools
  • User Guide
    • Formula
      • Symbols
    • Diameter of Circle
    • Radius of Circle

Related Tools

  • Calculate diameter of circle from radius
  • Circle area calculator using diameter
  • Circle circumference calculator using diameter
  • Length and distance converter
  • Sphere volume calculator using diameter
  • Sphere diameter to surface area calculator 

User Guide

This tool will calculate the radius of a circle from the diameter, and will convert different measurement units for diameter and radius.

Formula

The formula used to calculate circle radius is:

r = ø / 2

Symbols

  • r = Circle radius
  • ø = Circle diameter

Diameter of Circle

Enter the diameter of a circle. The diameter of a circle is the length of a straight line drawn between two points on a circle where the line also passes through the centre of a circle, or any two points on the circle, as long as they are exactly 180 degrees apart.

Radius of Circle

This is the radius of a circle that corresponds to the specified diameter. The radius is the distance between the centre and any point on the outer edge of a circle.

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Tool Sections

  • Area
  • Chemical Quantities
  • Circular Shapes
  • Density
  • Diameter & Radius
  • Energy & Power
  • Electrical & Electromagnetic
  • Flow
  • Force, Load & Torque
  • Length & Distance
  • Liquid Depth & Level
  • Mass & Weight
  • Movement & Motion
  • Pressure
  • Pricing & Quantities
  • Rectangular Shapes
  • Sensors & Instruments
  • Speed & Acceleration
  • Temperature & Heat
  • Time & Frequency
  • Travel & Transportation
  • Volumetric

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