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Circle Diameter to Area Calculator


Calculate Area of Circle
Diameter (ø) [?]
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 diameter, and calculate circle circumference, circle radius, sphere volume or sphere surface area instead


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Contents

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

Related Tools

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

User Guide

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

Formula

The formula used to calculate circle area is:

A = π x (ø/ 2)2

Symbols

  • A = Circle area
  • π = Pi = 3.14159…
  • 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.

Area of Circle

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

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Tool Sections

  • Density
  • Flow
  • Energy & Power
  • Force, Load & Torque
  • Input & Output Signals
  • Length, Area & Volume
  • Liquid Depth & Level
  • Mass & Weight
  • Pressure
  • Speed & Acceleration
  • Temperature
  • Time & Frequency

Product Selection Guides

  • Pressure Transmitters
  • Pressure Transducers
  • Liquid Level Sensors
  • Digital Pressure Gauges
  • Data Loggers

Application Selection Guides

  • Vacuum
  • Submersible
  • Low Pressure Range
  • Leak Testing
  • High Frequency Response
  • Dual Temperature and Pressure
  • Barometric Pressure

Help Guides

  • Reduce calibration costs of analogue pressure gauges
  • Measuring the difference in air pressure between rooms
  • How to get a 10 volt signal from a 4-20mA output pressure sensor
  • How to Connect a 4-20mA Current Loop Pressure Transmitter
  • Determining the hydrostatic pressure range for a tank level sensor
  • Choosing PVC, PUR, FEP and TPE cable types

Online Measurement Tools

  • Temperature Transmitter 4-20mA Current Output Calculator
  • Pressure Transmitter 4-20mA Current Output Calculator
  • Pressure Transducer 1-5V Voltage Output Calculator
  • Pressure Converter
  • Measurement Reading to 4-20mA Signal Converter
  • Liquid Depth/Level to Hydrostatic Pressure Calculator
  • Input to Output Measurement Reading Converter
  • Force & Area to Pressure Calculator
  • Density to Specific Gravity Calculator

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