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Radius to Area of Circle Calculator


Calculate Area of Circle
Radius (r) [?]
Area (A) [?]

Click save settings to reload page with unique web page address for bookmarking and sharing the current tool settings, or click flip tool to reverse the tool function with current settings

✕ clear settings

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


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Contents

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

Related Tools

  • Calculate radius of circle from area
  • Circle radius to circumference calculator
  • Circle radius to diameter calculator
  • Convert an area to different units
  • Length and distance converter
  • Sphere radius to volume calculator
  • Sphere radius to surface area calculator

User Guide

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

Formula

The formula used to calculate circle area is:

A = π x r2

Symbols

  • A = Circle area
  • π = Pi = 3.14159…
  • r = Circle radius

Radius of Circle

Enter the radius of a circle. The radius is the distance between the centre and any point on the outer edge of a circle.

Area of Circle

This is the area contained within a circle with the specified radius.

Primary Sidebar

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

Tool Feedback

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