Geometry Calculators & Tools
Area, Volume, Surface Area, Perimeter calculators for all shapes.
Geometry is all about shapes and the space they take up. These calculators find area, perimeter, surface area, and volume for the common shapes, and each one shows the formula so the result makes sense.
Circle Area Calculator
Calculate the area and circumference of a circle. Free online calculator with instant results, step-by-step explanations, and a clear worked example.
Cone Volume Calculator
Calculate the volume and surface area of a cone.
Cylinder Volume Calculator
Calculate the volume and surface area of a cylinder.
Ellipse Area Calculator
Calculate the area and circumference of an ellipse.
Regular Hexagon Calculator
Calculate the area and perimeter of a regular hexagon.
Parallelogram Area Calculator
Calculate the area of a parallelogram.
Regular Pentagon Calculator
Calculate the area and perimeter of a regular pentagon.
Prism Volume Calculator
Calculate the volume of any prism.
Pyramid Volume Calculator
Calculate the volume of a pyramid.
Rectangle Area Calculator
Calculate the area and perimeter of a rectangle.
Regular Polygon Area Calculator
Calculate the area of a regular polygon.
Rhombus Area Calculator
Calculate the area of a rhombus from its diagonals.
Sector Area Calculator
Calculate the area and arc length of a circular sector.
Circle Segment Area Calculator
Calculate the area of a circular segment.
Sphere Volume Calculator
Calculate the volume and surface area of a sphere.
Square Area Calculator
Calculate the area, perimeter, and diagonal of a square.
Torus Volume Calculator
Calculate the volume and surface area of a torus (donut shape).
Trapezoid Area Calculator
Calculate the area of a trapezoid.
Triangle Area Calculator
Calculate the area of a triangle using base and height.
How to choose the right Geometry tool
- Flat shapes like circles, triangles, and rectangles? Use the area and perimeter tools.
- Solid shapes like spheres, cylinders, and cones? Reach for the volume and surface-area tools.
- Have some measurements but not all? Many tools solve for the missing piece.
- Keep every measurement in the same unit before you calculate.
Who these tools are for
For students from primary school through high school, plus anyone measuring a room, garden, or project.
Need Help Solving a Problem?
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