# 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 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 area

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

Ever wondered how much you would have to paint if you were to repaint the pyramids? No? Well, you can calculate surface areas of pyramids (with four-sided bases) here if you ever find the need.#### 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 surface area of a cone

With this calculation you can calculate the surface area of a cone.#### 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 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 area of a triangle

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

Calculate the volume of all common geometrical shapes, such as cubes, spheres, pyramids, cones etc.#### 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 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 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 the surface area of a cube or a brick

Use this calculation to calculate the surface area of cubes and bricks.

## Some random calculations

#### How wonderful is your life?

Life is wonderful and if you want to find out exactly how wonderful your particular life is, this test is for you.#### Calculate when you will become a millionaire

This calculation will find out when you will become a millionaire (in any given currency) considering your current income (profit per month).#### What is the real cost of your car

There are several costs related to a car, not only gas and insurance. This calculation takes a stand point and calculates the real cost of your car. It can then be used to compare it to other cars or public transportation costs.#### Calculate how much you have cried over something

How much have you really cried over someone or something? Find out the volume of the tears you have shed over someone or something in this calculation.#### Calculate how much time you save by increasing the speed

This calculation will calculated how much time you save (or lose) per hour, by increasing or decreasing the speed of your vehicle.