📐 Geometry Calculator
Calculate area, perimeter, and other geometric properties for common shapes.
How to Use This Calculator
Select a shape
Choose from circle, rectangle, square, or triangle using the shape buttons.
Enter dimensions
Input the required measurements (radius, length/width, side length, or base/height).
Calculate
Click the "Calculate" button to compute area, perimeter, and other properties.
Review results
View the calculated area, perimeter, and other geometric properties for your shape.
Formulas
Circle
Area = π × r²
Circumference = 2 × π × r
Rectangle
Area = length × width
Perimeter = 2 × (length + width)
Square
Area = side²
Perimeter = 4 × side
Triangle
Area = ½ × base × height
Full Description
This geometry calculator helps you compute area, perimeter, and other geometric properties for common 2D shapes. Whether you're a student learning geometry, a professional working on design projects, or someone needing quick geometric calculations, this tool provides accurate results instantly.
The calculator supports four fundamental shapes: circles, rectangles, squares, and triangles. For each shape, it calculates the relevant properties using standard geometric formulas. All calculations are performed with precision suitable for academic and professional use.
Ideal for
- Students: Practice geometry problems and verify calculations.
- Teachers: Demonstrate geometric concepts and check student work.
- Designers: Calculate areas and perimeters for design projects.
- Construction: Estimate material quantities and dimensions.
Key Features
- ✅ Multiple shape support (circle, rectangle, square, triangle)
- ✅ Calculates area, perimeter, and other properties
- ✅ Handles decimal inputs with precision
- ✅ Clear, organized results display
Frequently Asked Questions
What units should I use?
You can use any units (meters, feet, inches, etc.). The calculator preserves your units in the results. Just make sure all inputs use the same unit system.
Can I calculate volume or surface area?
This calculator focuses on 2D shapes (area and perimeter). For 3D shapes and volume calculations, use our specialized 3D geometry calculators.
What if I have a right triangle?
For right triangles, you can use the base and height. For other triangle types, you may need additional calculators that handle different triangle formulas.
How precise are the calculations?
Results are displayed with 4 decimal places. The internal calculations use JavaScript's floating-point precision, which is suitable for most practical applications.
Can I calculate irregular shapes?
This calculator handles regular geometric shapes. For irregular shapes, you may need to break them down into regular shapes or use specialized area calculation methods.