# Circumference of a circle Calculator | Given area, radius

## Circle Calculator

## Circle papramters

## How to use the online Circle calculator

You can use our online calculator for circle to find various paramters such as Area, Circumference/ perimeter, Diamter, Radius for any given circle

For each calculation you will need to input the base paramter depending on your selected calculation. Use the dropdown selector to choose the type of calculation e.g Calculate Area from Diamter

Once you have entered the base parameter e.g Radius, Circumference, Area or Diameter, hit the calculate Button to compute

**Commonly Used Symbols and their Meaning**

- r = radius
- d = diameter
- C = circumference
- A = area
- π = pi = 3.1415926535898
- √ = square root

## Area of a circle with radius calculator

A circle is a figure bounded by a smooth curve such that all its points are equal distance from a central point (center of a circle). The area of a circle is the measure of unit squares that can fit inside of the figure. To calculate the area of a circle, we use the circle area formula using the radius, or diameter.

The area of a circle is given by the formula

A= \pi r^2Where \pi is a constant of approximation that is approximately 3.14159265359

## Find area of a circle from radius formula calculator

This calculator helps you find the area of any given circle using its radius. Thus, with a radius, you can easily calculate the area, circumference or the diameter of a circle. To calculate the area of a circle given the radius, simply input the radius, in the input given, choose the units and click on the calculate button to compute the area.

## Circle square footage calculator

While most online calculators work with metric units such as cm, and m, our area of a circle solver allows you to choose your preferred units. You can find the area of a circle using ft, yards, meters, inches etc. The formula to find the area of a circle is independent of the selected units.

## Find the area of a circle given the diameter

The area of a circle is given by the formula

A= pi r^2However you can calculate the area from other parameters such as the diameter or the circumference. Since diameter is twice the radius, it is easy to convert the diameter into radius.

i.e D= 2r \implies r= \frac{d}{2}

Thus A= \pi \times (\frac{d}{2})^2

## Area of a circle from diameter calculator

For any given circle, it is easy to compute its area given the diameter or the radius. All that is required is to plug in the given parameters into the formula. While finding the area of a circle given the diameter, mistakes may arise leading to a wrong answer. To avoid all these, simply use the area of a circle calculator using the diameter

## Find the area of a circle from the circumference

Finding the area of a circle from the radius is the most common approach for computing the area of a circle. However, it is possible to find the area of a circle from its circumference.

The circumference of a circle is given by the formula

C= \pi d= 2 \pi r, where C= circumference and d= diameterThus r= \frac{C}{2 \times \pi}

And A= \pi \times {frac{C}{2 \times \pi})^2= \frac{C^2}{2 \times \pi}

## Find the area given the circumference calculator

Given the circumference of a circle, it is easy to calculate its area using the online calculator for the area. The Circumference is first used to find the diameter of the circle, which is then applied in finding the radius. With the radius of the circle, you can find the area or the circumference of the given circle easily.

## Finding the circumference of a circle using radius calculator

Our calculator allows you to compute the circumference of any given circle from its radius. Given the radius of a circle, we can find its circumference from the formula

C= 2pir, where r= radius of the circle and C= circumference of the circle.

## Calculate circumference from radius

This online calculator uses the circumference formula to find the perimeter of any given circle. To proceed, simply input the value of radius on the input field provided, select your preferred units and hit the calculate button to calculate.

## Diameter to circumference calculator

Our calculator allows you to find the circumference, radius of a circle given its diameter. For any given circle, the diameter can be given by the formula

d= 2r And circumference C= \pi d

## Find the circumference, diameter and radius from area of a circle

The area of a circle can be given by the formula A= \pi r^2 Thus r = \sqrt {\frac{A}{\pi}} And C= \sqrt ({A}{\pi}) d= 2 \times \sqrt( \frac {A}{\pi})

## Convert circumference to area calculator

For any given circle, our calculator allows you to compute its circumference from the given area. For any given area, we can easily find the circumference of the circle using the perimeter of a circle formula.