Math calculators
Geometry Calculators
17 tools
Pythagorean theorem, general triangles, circles, conics, and plane figures. Vectors, solids, and analytic geometry have their own Families. Tools may appear in more than one topic.
Popular in Geometry
Featured tools from the Family registry.
- 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.
- Triangle Solver Solve a Euclidean triangle from SSS, SAS, ASA, AAS, or SSA (ambiguous case). Not the Pythagorean-only calculator. Runs locally.
- Circle Calculator Compute diameter, circumference, and area from r, or arc and sector from a central angle. Discovery /sector, /arc. Not the Pythagorean page. Not /spherical-sector. Not CAS. Runs locally.
- Plane Geometry Calculator Rectangle, square, regular n-gon, annulus, parallelogram, isosceles trapezoid, and irregular polygon (shoelace). Discovery /rectangle, /square, /regular-polygon, /annulus, /parallelogram, /trapezoid, /irregular-polygon. Not the circle-only page. Not a triangle solver. Not solid geometry. Not /square-root. 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.
All Geometry
Every live calculator in this family. URLs stay /calc/math/…
- Annulus Calculator Annulus A = π(R² − r²) and P = 2π(R + r) with outer R > inner r. Same engine as Plane Geometry. Not /circle. Not a square. Not CAS. Runs locally.
- Arc Calculator Circle arc s = r θ from radius and central angle. Same engine as Circle. Not /sector. Not /spherical-sector. Not CAS. Runs locally.
- Circle Calculator Compute diameter, circumference, and area from r, or arc and sector from a central angle. Discovery /sector, /arc. Not the Pythagorean page. Not /spherical-sector. 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.
- 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.
- 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.
- 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, /square, /regular-polygon, /annulus, /parallelogram, /trapezoid, /irregular-polygon. Not the circle-only page. Not a triangle solver. Not solid geometry. Not /square-root. 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.
- Sector Calculator Circle sector A = (1/2) r² θ from radius and central angle. Same engine as Circle. Not /spherical-sector. Not /annulus. Not CAS. Runs locally.
- Square Calculator Square A = s², P = 4s, d = s√2. Same engine as Plane Geometry. Not /rectangle. Not /square-root. 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.