Geometry Calculator: 2D & 3D

Geometry Calculator helps you calculate triangle and circle area, perimeter, volume and surface area for plane and solid figures. Enter the known values, choose what you need to find, and get the result with the formulas used in the calculation.

Calculate:
• area, perimeter and circumference
• volume and surface area
• sides, diagonals, radii and heights
• angles, arcs, sectors and other shape parameters

2D shapes include triangles, squares, rectangles, parallelograms, rhombuses, trapezoids, polygons, circles, rings and ellipses.

3D solids include cubes, cuboids, prisms, pyramids, cylinders, cones, frustums, spheres and polyhedra.

TRIANGLE CALCULATOR: SIDES AND ANGLES
Find the area and perimeter of a triangle, calculate its sides and angles using the available input options, and review the corresponding geometry formulas. This triangle solver works with numerical values you supply. It is useful when checking a calculation from an exercise or comparing triangles with different dimensions. Choose a calculation that matches the data you know.

CIRCLE CALCULATOR: AREA, ARCS AND SECTORS
Work with circle area, radius and circular parts in one place. Calculate arc length and sector area, or use the available circular segment calculations. For a ring-shaped figure, select the annulus and its sector options. A whole circle, a sector and a segment describe different regions: select the right one before entering your values.

AREA AND PERIMETER OF 2D SHAPES
Use the area calculator for a square, rectangle, parallelogram, rhombus, trapezoid, ellipse or quadrilateral. The perimeter calculator helps you find the boundary length of supported figures. Calculate a square's diagonal or explore the diagonal calculations for rectangles, parallelograms and rhombuses. Polygon calculations include area and angles. Each shape has its own set of available parameters.

VOLUME AND SURFACE AREA CALCULATOR
Calculate cylinder volume, cone volume, sphere volume or the volume of a cube, cuboid, prism and pyramid. Surface area describes the outside of a solid, while volume describes the space it occupies. For cylinders, cones, cone frustums and pyramids, the app also includes lateral surface area calculations. Additional options cover the area and volume of an octahedron and the volume of a truncated pyramid. Select the solid that matches your problem rather than treating all 3D shapes as interchangeable.

FROM FORMULA TO NUMERICAL RESULT
Use Geometry Calculator to check homework calculations, revisit a geometry formula or compare results after changing an input. Start with the figure and known measurements, then choose the relevant calculation. The available inputs depend on the selected formula.

Interactive drawings update when values change, making formulas and geometric relationships easier to understand. Use the app as an area calculator, volume calculator, triangle calculator or geometry formula reference.

Useful for students, teachers, engineers, technicians, builders and anyone who works with geometry. Results depend on the values you enter; check units and input data before using a calculation in practice.