Geometry
Area, volume, triangle, circle, distance, and shape calculators.
Showing 19 tools
Geometry
Area Calculator
Calculate the area of common 2D shapes using the correct formula for rectangles, squares, circles, triangles, and trapezoids. Keep the same unit for every dimension so the result is a true square-unit measurement.
Circle Calculator
Calculate circle measurements from Radius or diameter, with the key formulas and caveats needed to interpret the result correctly.
Cone Calculator
Enter the base radius and perpendicular height to get cone volume, slant height, lateral surface area, and total surface area. The height is the straight distance from base center to apex, not the slant.
Cube Calculator
Enter the side length to instantly calculate volume, surface area, face diagonal, and space diagonal of a cube. All six faces of a cube are equal squares, so one number describes the entire shape.
Cylinder Calculator
Enter radius and height to calculate cylinder volume, total surface area, and lateral surface area. Use radius (not diameter) — divide any measured diameter by 2 before entering.
Distance Calculator
Calculate euclidean distance from Two coordinate points, with the key formulas and caveats needed to interpret the result correctly.
Ellipse Calculator
Enter the semi-major axis (a) and semi-minor axis (b) to calculate the area, perimeter, and eccentricity of an ellipse. The perimeter uses Ramanujan's accurate approximation — there is no exact closed-form formula.
Parallelogram Calculator
Enter the base, the adjacent side, and the perpendicular height to calculate area and perimeter. The height is the distance between the two parallel bases measured at 90°, not the slant length of the side.
Pythagorean Theorem Calculator
Solve for any missing side of a right triangle: find the hypotenuse from both legs, or find a missing leg from the hypotenuse and the other leg. Enter two known sides and the calculator does the rest.
Rectangle Calculator
Enter the length and width to get area, perimeter, and diagonal in one step. Keep both dimensions in the same unit for a correct squared-unit area result.
Rectangular Prism Calculator
Enter length, width, and height to calculate volume, total surface area, and space diagonal of a rectangular prism (cuboid). Use the same unit for all three dimensions.
Right Triangle Calculator
Enter the two perpendicular legs to calculate the hypotenuse, both acute angles, area, and total perimeter.
Slope Calculator
Enter two points to calculate slope, line equation, distance between points, and whether the line rises, falls, stays horizontal, or is vertical.
Sphere Calculator
Enter the sphere radius to instantly get volume, surface area, and diameter. All sphere properties depend on a single measurement.
Square Calculator
Enter the side length to instantly get area, perimeter, diagonal, and inscribed circle radius. All four sides of a square are equal, so one number describes the whole shape.
Surface Area Calculator
Choose a 3D shape, enter its dimensions, and calculate the total exposed area in square units.
Trapezoid Calculator
Enter the two parallel sides, the perpendicular height, and the two non-parallel legs to calculate area and perimeter. The height must be the perpendicular distance between the parallel sides, not the slanted leg length.
Triangle Calculator
Enter three side lengths to verify triangle validity and calculate area, perimeter, interior angles, and type.
Volume Calculator
Calculate the volume of spheres, cubes, cylinders, cones, and rectangular prisms. Enter dimensions in one unit system and read the result as cubic units, with liter guidance when dimensions are in centimeters.
