# 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 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 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 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 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 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 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 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 area

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

## Some random calculations

#### What is the current worth of your passive income?

If you have a website (or similar) that provide you with passive income, this calculation will help you calculate the current worth of your future income. You can use it to estimate a selling price.#### Convert km/h, meters per second and miles per hour

Even though these conversions are covered in the Converter on this website, they are so common that they have their own converter. You can convert between miles per hour, meters per second and kilomoters per hour.#### Find out date of conception

Calculate the presumed date of conception for a pregnancy.#### Find out the weekday of a certain date

What day of the week was it when you were born? Was your wedding really on a Saturday? Which weekday did the French Revolution take place? Find it all out in this calendar calculation.#### 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.

### More on this subject...

Area-Circle