Math calculators
Geometry Calculators
27 tools
Pythagorean theorem, general triangles, circles, and coordinate geometry.
Popular in Geometry
Featured tools from the Family registry.
All Geometry
Every live calculator in this family. URLs stay /calc/math/…
- Angle Between Lines Calculator Acute angle between two plane lines, each given by two points. Parallel is 0°. Perpendicular is 90°. Degenerate points are invalid. Same engine as Coordinate Geometry. Not a second engine. Not CAS. Runs locally.
- Circle Calculator Compute diameter, circumference, and area from r, or arc and sector from a central angle. Not the Pythagorean page. Runs locally.
- Cone Calculator Right circular cone V = (1/3)πr²h and slant l = √(r²+h²). Same engine as Solid Geometry. Not ISO 5167-5. Not CAS. Runs locally.
- Conic Section Calculator Axis-aligned ellipse, parabola, and hyperbola in standard form. Discovery /ellipse, /parabola, /hyperbola. Not the circle-only page. Not coordinate geometry. Not CAS. Runs locally.
- Coordinate Geometry Calculator Distance, midpoint, and slope of two points in the plane. Line through two points is /line-equation. Point-to-line distance is /point-line-distance. Intersection is /line-intersection. Angle is /angle-between-lines. Not the Pythagorean-only page. Runs locally.
- Cross Product Calculator Vector product u × v in R³. 2-D uses uz = vz = 0. Same engine as Vector. Not a matrix. Not CAS. Runs locally.
- Cylinder Calculator Right circular cylinder V = πr²h and A = 2πr(r+h). Same engine as Solid Geometry. Not CAS. Runs locally.
- Dot Product Calculator Scalar product u · v = ux vx + uy vy + uz vz. Same engine as Vector. Not a matrix. Not CAS. Runs locally.
- Ellipse Calculator Standard ellipse x²/a² + y²/b² = 1. Same engine as Conic Section. a = b is a valid ellipse with e = 0; the circle-only page is /circle. Not CAS. Runs locally.
- Frustum Calculator Right circular frustum V = (1/3)πh(R²+Rr+r²) from two radii and height. Same engine as Solid Geometry. Not /cone. Not ISO 5167-5. Not CAS. Runs locally.
- Hyperbola Calculator Standard hyperbola x²/a² − y²/b² = 1 (horizontal) or y²/a² − x²/b² = 1 (vertical). Same engine as Conic Section. Not CAS. Runs locally.
- Irregular Polygon Calculator Shoelace area of a simple 3–8 vertex polygon. Same engine as Plane Geometry. Not /regular-polygon. Not a triangle solver. Not CAS. Runs locally.
- Line Equation Calculator Equation of the line through two plane points. Same engine as Coordinate Geometry. Vertical is x = x₁. Coincident points are invalid. Not Pythagorean. Not a second engine. Not CAS. Runs locally.
- Line Intersection Calculator Intersection of two plane lines, each given by two points. Parallel distinct lines are empty. Coincident lines are infinite. Degenerate points are invalid. Same engine as Coordinate Geometry. Not a second engine. Not CAS. Runs locally.
- Parabola Calculator Standard parabola x² = 4py (vertical) or y² = 4px (horizontal). Same engine as Conic Section. p ≠ 0. Not CAS. Runs locally.
- Parallelogram Calculator Parallelogram A = ab sin θ, P = 2(a+b), diagonals from a, b, and included angle. Same engine as Plane Geometry. Not a rectangle page. Not the fluid trapezoid. Not CAS. Runs locally.
- Plane Geometry Calculator Rectangle, square, regular n-gon, annulus, parallelogram, isosceles trapezoid, and irregular polygon (shoelace). Discovery /rectangle, /regular-polygon, /parallelogram, /trapezoid, /irregular-polygon. Not the circle-only page. Not a triangle solver. Not solid geometry. Not CAS. Runs locally.
- Point Line Distance Calculator Perpendicular distance from a plane point to the line through two points. Same engine as Coordinate Geometry. Coincident line points are invalid. Not Pythagorean. Not a second engine. Not CAS. Runs locally.
- Pythagorean Theorem Calculator Solve a right triangle with a² + b² = c². Enter any two of legs a, b and hypotenuse c to find the third side, plus area and perimeter. Try it free.
- Rectangle Calculator Rectangle A = ab, P = 2(a+b), d = √(a²+b²). Same engine as Plane Geometry. Not Pythagorean-only. Not CAS. Runs locally.
- Regular Polygon Calculator Regular n-gon A = (n s²)/(4 tan(π/n)) for integer n≥3. Same engine as Plane Geometry. Not a triangle solver. Not CAS. Runs locally.
- Solid Geometry Calculator Right circular sphere, cylinder, cone, ring torus, and conical frustum. Discovery /sphere, /cylinder, /cone, /frustum. Not the circle-only page. Not a vector. Not ISO 5167-5. Not CAS. Runs locally.
- Sphere Calculator Sphere V = (4/3)πr³ and A = 4πr². Same engine as Solid Geometry. Not the circle-only page. Not CAS. Runs locally.
- Trapezoid Calculator Isosceles trapezoid A = (a+b)h/2 from two bases and height. Same engine as Plane Geometry. Not /trapezoidal-rule. Not the fluid trapezoid. Not CAS. Runs locally.
- Triangle Solver Solve a Euclidean triangle from SSS, SAS, ASA, AAS, or SSA (ambiguous case). Not the Pythagorean-only calculator. Runs locally.
- Vector Calculator R²/R³ magnitude, normalize, add/sub, dot, cross, angle, projection, and scalar triple product. Discovery /vector-magnitude, /dot-product, /cross-product. Not a matrix. Not CAS. Runs locally.
- Vector Magnitude Calculator Euclidean length |u| = √(ux²+uy²+uz²). Same engine as Vector. uz defaults to 0. Not a matrix. Not CAS. Runs locally.