# 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 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 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 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 area of a triangle

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

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

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

## Some random calculations

#### 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.#### Find out your chances to score when you go out tonight

So you are going out tonight? Perhaps on a date, to a nightclub or just to spend a quiet evening at the bridge club. This amazing calculator will estimate your chances of getting laid tonight!#### Estimate your body fat

Estimate how much body fat you have (in percent), a very rough estimate.#### Reversed BMI-calculation

This is a reversed version of the normal BMI calculation. Instead of calculating the BMI you calculate the weight that will provide you with a certain BMI.#### Calculate when you will turn 10 000 days (or similar)

Calculate when you will have your 10 000th birthday or will turn 20 000 days and so on.

### More on this subject...

Area-Circle