Shape Calculator
Calculate area, perimeter, and volume for common 2D and 3D shapes.
Measurements
What is Shape Calculator?
Shape Calculator finds area, perimeter, circumference, volume, and surface area for six common shapes: circle, rectangle, square, right triangle, sphere, and cylinder. Select the shape, enter the dimensions, and every relevant measurement appears instantly with the formula used shown below.
Works with any unit — enter centimetres, inches, or feet and the results will be in the same unit squared or cubed. Useful for students, architects, DIY projects, and anyone who needs quick geometry calculations without opening a textbook.
Common Use Cases
- Calculating room area for flooring, paint, or tiling estimates
- Finding the volume of a container, tank, or storage space
- Computing triangle dimensions for construction or carpentry
- Checking geometry homework answers against known formulas
- Estimating material quantities for DIY or craft projects
How to Use Shape Calculator
- Select the shape you need from the shape grid.
- Enter the required dimensions (radius, width, height, or side length).
- The calculated measurements appear on the right.
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FAQ
Which shapes are supported?
Circle, rectangle, square, right triangle, sphere, and cylinder.
What measurements does it calculate?
For 2D shapes: area, perimeter, and where relevant circumference or diagonal. For 3D shapes: volume, lateral surface area, and total surface area.
What units does it use?
The tool works with whatever unit you enter — it does not assume a specific unit. If you enter dimensions in centimetres, the area will be in cm² and volume in cm³.
What is a right triangle?
A right triangle has one 90-degree angle. The tool asks for the base and the perpendicular height, then calculates the area, hypotenuse length, and perimeter.
Does it run in the browser?
Yes. All calculations are done locally with standard math formulas. No data is sent anywhere.
How do I calculate the area of a circle online?
Select the Circle shape, enter the radius, and the tool instantly shows the area (π × r²), circumference (2π × r), and diameter. You can enter the radius in any unit and the area result will be in that unit squared.