# 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 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 surface area of a cone

With this calculation you can calculate the surface area of a cone.#### 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 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 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.#### Calcualate the area of a square or rectangle

Use this calculation to calculate the area of a square or a rectangle.#### Calculate the surface area of a cube or a brick

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

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

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

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

## Some random calculations

#### Calculate how much calories you spend at rest

Calculate how much calories you burn, while at rest, considering your weight, age etc.#### Calculate how many days there are between two given dates.

Calculate how many days there are between two given dates, for example today and Christmas Day.#### Calculate how much money you can spend per day until payday

So, you have paid all your bills and perhaps spent a bit more. Now, calculate how much you have left to spend per day considering how much money you have left from your pay check.#### Calculate volume

Calculate the volume of all common geometrical shapes, such as cubes, spheres, pyramids, cones etc.#### Calculate the birth/delivery date of your baby

Calculate the expected date when your baby will be born with this simple calculation.

### More on this subject...

Area-Circle