📐 Geometry & Trigonometry Calculators
Areas, volumes, triangles, circles, coordinates and vectors. Browse 36 free geometry & trigonometry calculators, each with the formula, a worked example and an interactive chart.
Circle CalculatorFind area, circumference and diameter from the radius.Circle Sector and Arc CalculatorCompute arc length and sector area from a central angle.Triangle Area Calculator (Heron)Find area and perimeter of a triangle from three sides.Triangle Angles from Sides CalculatorFind all angles of a triangle from its three sides (law of cosines).Law of Sines CalculatorSolve a triangle given an angle, its opposite side and a second angle.Law of Cosines CalculatorFind the third side from two sides and the included angle.Right Triangle SolverSolve a right triangle from one angle and a side.Trigonometric Functions CalculatorCompute sine, cosine and tangent of an angle in degrees.Inverse Trigonometric Functions CalculatorCompute arcsin, arccos and arctan.Degrees to Radians ConverterConvert between degrees, radians and gradians.Rectangle CalculatorCompute area, perimeter and diagonal of a rectangle.Trapezoid Area CalculatorFind the area of a trapezoid.Parallelogram Area CalculatorFind area and perimeter of a parallelogram.Regular Polygon CalculatorFind area, perimeter and angles of a regular polygon.Ellipse CalculatorFind the area and perimeter (Ramanujan) of an ellipse.Sphere CalculatorFind volume and surface area of a sphere.Cylinder CalculatorCompute volume and surface area of a cylinder.Cone CalculatorCompute volume and surface area of a cone.Rectangular Prism (Box) CalculatorFind volume, surface area and diagonal of a box.Pyramid Volume CalculatorCompute volume and slant height of a square pyramid.Torus (Donut) CalculatorFind volume and surface area of a torus.Cone Frustum CalculatorFind volume of a truncated cone.Spherical Cap Volume CalculatorCompute volume of a spherical cap or dome.Distance and Midpoint Calculator (2D)Find the distance and midpoint between two points.Distance Between Two 3D Points CalculatorFind the distance between points in 3D.Circle Equation from Three Points CalculatorFind the circle through three points.Triangle Area from Coordinates CalculatorCompute triangle area from three vertices (shoelace formula).Similar Triangles Scale CalculatorFind an unknown side using similar triangles.Height from Shadow CalculatorFind the height of an object from its shadow and the Sun angle.Slope, Grade and Angle ConverterConvert between slope percent, ratio and degrees.Chord and Segment CalculatorFind chord length and segment height of a circle.Polar to Cartesian ConverterConvert polar coordinates to Cartesian and back.Triangle Inradius and Circumradius CalculatorFind inscribed and circumscribed circle radii of a triangle.Golden Ratio CalculatorCompute golden rectangle dimensions.Pipe and Tube Volume CalculatorFind volume of liquid held by a pipe.Horizontal Cylindrical Tank Volume CalculatorFind liquid volume in a horizontal cylindrical tank by fill depth.
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