📐 Geometry
Area, perimeter, volume, and surface area calculators.
Geometry turns measurements into answers: one page covers squares, another circles, another right triangles. Each calculator shows the formula at work, so picking a tool also refreshes the rule behind it.
- Area CalculatorArea of a square (side × side)
- Square Area CalculatorArea of a square
- Square Perimeter CalculatorPerimeter of a square
- Rectangle Area CalculatorArea of a rectangle
- Rectangle Perimeter CalculatorPerimeter of a rectangle
- Triangle Area CalculatorArea of a triangle from base and height
- Circle Area CalculatorArea of a circle
- Circumference CalculatorCircumference of a circle
- Trapezoid Area CalculatorArea of a trapezoid
- Parallelogram Area CalculatorArea of a parallelogram
- Pythagorean Theorem CalculatorHypotenuse of a right triangle
- Volume of a Box CalculatorRectangular box volume
- Cube Volume CalculatorVolume of a cube
- Sphere Volume CalculatorVolume of a sphere
- Cylinder Volume CalculatorVolume of a cylinder
- Cone Volume CalculatorVolume of a cone
Frequently asked questions
How do I know which area formula to use?
Match the formula to the shape by counting independent measurements: a square takes one side, a rectangle two, a triangle needs a base with a height, and a circle asks only for the radius. The list above keeps those calculators one click away.
Why do units matter so much in geometry?
Lengths in units, areas in square units, and volumes in cubic units: the power of the measurement tells you which quantity you hold. Comparing an area in square meters with a length in meters is a mismatch the units expose immediately.
Which geometry calculator fits my shape?
Four equal sides: the square tools. Two distinct sides: the rectangle pages. Any circle: the radius-based area, circumference, and sphere or cylinder volume family. Right triangles: the Pythagorean calculator. Slanted parallelograms and trapezoids have their own dedicated pages.