Geometry Calculator

You can use this free online geometry calculator to find the area, circumference, or volume of various geometry figures.

Enter Radius of Circle/Cylinder

Enter Height of Cylinder


(Make sure you entered the radius)

The calculation and answer is below:

Enter Measurments for Rectangle Area:


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How to use the calculator to find the area or the circumfernce of a circle

To find the area of a circle, enter the circle's radius in the first text box, then click on the "get area" button. The detailed calculations and the final answer will be displayed in the third text box. To find the circumference of a circle, enter the circle's radius in the first text box, then click on the "get circumference" button.

To learn more about finding the area of a circle click on this link to watch a free online video.

How to use the calculator to find the volume of a cylinder

To find the volume of a cylinder, enter the radius of the cylinder's base in the first text box and the height in the second text box, then click on the "get volume of cylinder" button. The detailed calculations and the final answer will be displayed in the third text box.

How to use the calculator to find the area of a rectangle

To find the area of a rectangle, enter the length of the rectangle in the fourth text box and the width of the rectangle in the last text box. Click on the "get area" button. The detailed calculations and the final answer will be displayed in the third text box.

Return from the Geometry Calculator page to Geometry Videos or to Free Math Videos Online