# 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 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 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.#### 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 cone

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

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

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

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

## Some random calculations

#### 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).#### Convert miles per gallon to liters per 100 kilometer (and vice versa)

A commonly used conversion is the conversion between miles per gallon and liters per kilometer (the most common conversions for fuel consumption). These are covered in the Converter but since it is so popular it is converted separately here as well.#### Calculate the monthly cost (or income/profit) for different interest rates and money.

This calculation will calculate the monthly cost, or income, from a loan or account considering different interest rates.#### Converter

This calculation will help you converting most common measurements within weight, length, area, volume, speed etc.#### The Ultimate Relationship Calculator

Find out how well you and your partner fit together, how long you have been together, when you will break up (if you do) and, if so, why you will break up.

### More on this subject...

Area-Circle