📐 Geometry & Trigonometry Calculators
Areas, volumes, triangles, circles, coordinates and vectors. Browse 72 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.Rhombus Area and Side CalculatorFind the area, side length and perimeter of a rhombus from its two diagonals.Annulus (Ring) Area CalculatorFind the area and width of a flat ring between two concentric circles.Hemisphere Volume and Surface CalculatorFind the volume and surface areas of a hemisphere from its radius.Regular Polygon Prism Volume CalculatorFind the base area and volume of a prism whose base is a regular polygon.Regular Octahedron CalculatorFind the volume and surface area of a regular octahedron from its edge length.Regular Tetrahedron CalculatorFind the volume and surface area of a regular tetrahedron from its edge length.Isosceles Triangle CalculatorFind the height, area and apex angle of an isosceles triangle from its base and leg lengths.Equilateral Triangle CalculatorFind the area, height and perimeter of an equilateral triangle from its side.Polygon Interior and Exterior Angles CalculatorFind the interior angle, exterior angle and angle sum of a regular polygon from its number of sides.Polygon Diagonals CalculatorCount the diagonals of a polygon and the triangles made by triangulating it.Slope Calculator from Two Points (Angle and Length)Find the distance, angle from the x-axis and slope of the line joining two points.Triangle Centroid CalculatorFind the centre of mass (centroid) of a triangle from the coordinates of its three corners.Distance Between Parallel Lines CalculatorFind the distance between two parallel lines written as Ax + By + C = 0.Rotate a Point in 2D CalculatorFind the new coordinates of a point after rotating it about the origin by an angle.Cube CalculatorFind the volume, surface area and space diagonal of a cube from its edge.Ellipse Foci and Eccentricity CalculatorFind the focal distance and eccentricity of an ellipse from its semi-axes.Parabola Focus and Directrix CalculatorFind the focus and directrix of the parabola y = ax² relative to its vertex.Sphere Radius from Volume CalculatorFind the radius and surface area of a sphere from its volume.Circle Radius and Area from Circumference CalculatorFind the radius and area of a circle from its circumference.Great-Circle Distance Calculator (Haversine)Find the shortest distance over the Earth surface between two points given by latitude and longitude.Initial Compass Bearing CalculatorFind the starting compass bearing from one point on Earth to another.Triangular Prism Volume CalculatorFind the base area and volume of a prism whose base is a triangle with three known sides.Roof Pitch and Rafter CalculatorFind the roof pitch angle, slope percentage and rafter length per metre of run from rise and run.Stair Stringer CalculatorFind the number of steps, the exact riser height and the stringer length for a staircase.Concrete Slab Volume CalculatorFind how much concrete a rectangular slab needs, including a waste allowance.Brick Count for a Wall CalculatorEstimate how many bricks a wall needs, allowing for mortar joints and waste.Paint Quantity CalculatorEstimate how many litres of paint a wall or surface needs for a number of coats.Tile Quantity CalculatorWork out how many tiles a floor needs, including an allowance for cuts and breakage.Rectangular Tank Volume CalculatorFind the water volume in a rectangular tank in litres and cubic metres.Pool Volume with Sloped Floor CalculatorFind the water volume of a pool whose depth changes from shallow to deep end.Wheel Revolutions per Kilometre CalculatorFind how many turns a wheel makes per kilometre from its diameter.Circular Arch Radius CalculatorFind the radius and centre position of a circular arch from its span and rise.Hex Nut Across Flats and Corners CalculatorConvert the across flats size of a hexagon into across corners and side length.Bolt Circle Hole Spacing CalculatorFind the spacing between holes evenly placed on a bolt circle.Gear Centre Distance CalculatorFind the centre to centre distance of two meshing gears from their tooth counts and module.Largest Square in a Circle CalculatorFind the largest square that fits inside a circle and how much area is left over at the corners.
About Geometry & Trigonometry calculators
Areas, volumes, triangles, circles, coordinates and vectors. CalcDepo has 72 free geometry & trigonometry calculators. Each one shows the formula, the variables and their units, a worked example and a chart of how the result changes, so you can check homework, plan a lab or understand the idea behind the numbers.
Popular calculators here include Circle, Circle Sector and Arc, Triangle Area, Triangle Angles from Sides, Law of Sines, Law of Cosines. Common searches in this category include “area of a circle”, “pizza slice area”, “heron formula”, “solve triangle sss”.
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