# Calculate the area of a circle

Use this calculation to calculate the area of a circle. You can use numerous different inputs and choose to submit the radius, the diameter or the circumference of the circle. In the result you will get all unknown variables presented.

## Related calculations

#### Calculate the volume of a pyramid

Calculate the volume of a pyramid with a four-sided bases (such as, well, the pyramids!) using several different dimensions for both input and output.#### Calculate the volume of a sphere

Calculate the volume of a sphere (such as the earth, a marble) using many different dimensions for both input and output.#### Calculate the volume of a cone

Calculate the volume of a cone (such as an ice cream cone), it allows multiple different types of inputs and outputs - depending on your need.#### Calculate the surface area of a cone

With this calculation you can calculate the surface area of a cone.#### Calculate the surface area of different geometrical shapes

The surface area is the surface part of a three-dimensional object. You can use these calculations to determine that here.#### Calculate the area of a circle

This calculation will calculate the area of a circle using either the diameter, the radius or the circumference as input.#### Calculate the surface area of a cube or a brick

Use this calculation to calculate the surface area of cubes and bricks.#### Calcualate the area of a square or rectangle

Use this calculation to calculate the area of a square or a rectangle.#### Calculate the volume of a cylinder

Calculate the volume of a cylinder (such as a beer can or a hose) using many different dimensions for both input and output.#### Calculate the area of a triangle

Calculate the area of a (right-angled) triangle with this calculation.#### Calculate the volume of a cube or brick

Calculate the volume of a cube or brick (such as a dice or an iPhone) using plenty of different input measurements and get the volume in any dimension you want.#### Calculate the surface area of a cylinder

If you would unfold a cylinder it would become a rectangle. Calculate the surface area of a cylinder (i.e. that rectangle) here.#### Calculate the surface area of a sphere

How much space do we have to live on, on planet Earth? Calculate this and many other things in this calculation for surface area for spheres.#### Calculate area

Calculate the area of all common geometrical shapes, such as circles, triangles etc.#### Calculate volume

Calculate the volume of all common geometrical shapes, such as cubes, spheres, pyramids, cones etc.

## Some random calculations

#### Count the occurence of a specific word or character in a text

Here you can count how many times a certain word or specific characters occur in a specific text. The calculation will also count the total numbers of words and characters.#### Calculate the surface area of a cube or a brick

Use this calculation to calculate the surface area of cubes and bricks.#### Calculate how many days there are left until a certain date

Calculate how many days there are left until a certain date, or how many days ago there was since a certain date.#### How long will your hair become if you save it?

Calculate how much longer your hair will be at a certain date.#### Estimate your body fat

Estimate how much body fat you have (in percent), a very rough estimate.

### More on this subject...

Area-Circle