Geometry & Trig
Area, volume and surface area of shapes, triangle solvers, the laws of sines and cosines, coordinates and trig functions.
23 tools
- Circle CalculatorKnow one of a circle's radius, diameter, circumference or area? Get all the others.
- Frustum CalculatorFind the volume and surface area of a conical frustum — a cone with its top cut off, like a bucket or lampshade.
- Rectangular Prism (Box) CalculatorFind the volume, surface area and space diagonal of a box (cuboid).
- Triangular Prism CalculatorFind the volume and surface area of a triangular prism from its triangle's three sides and its length.
- Pyramid CalculatorFind the volume, slant heights and surface area of a right pyramid with a rectangular or square base.
- Regular Polygon CalculatorFind the area, perimeter, apothem and angles of any regular polygon from its number of sides and side length.
- Triangle SolverSolve any triangle from three known parts — SSS, SAS, ASA, AAS or SSA (showing both triangles in the ambiguous case).
- Right Triangle CalculatorSolve a right triangle from any two values — two sides, or one side and one acute angle.
- Law of Sines CalculatorUse the law of sines to find a missing side or angle — including both answers when two triangles fit.
- Law of Cosines CalculatorUse the law of cosines to find the third side from two sides and the angle between them, or any angle from three sides.
- Distance Calculator (2D & 3D)Find the straight-line distance between two points on a plane or in 3D space.
- Slope & Line Equation CalculatorFind the slope through two points and the line's equation in slope-intercept, point-slope and standard form.
- Trapezoid CalculatorFind a trapezoid's area and median from its two bases and height, plus the perimeter if you know the legs.
- Parallelogram & Rhombus CalculatorFind the area, perimeter, height and diagonals of a parallelogram, or a rhombus from its diagonals.
- Ellipse CalculatorFind an ellipse's area, exact perimeter, eccentricity and foci from its two semi-axes.
- Annulus (Ring) CalculatorFind the area of a ring (annulus) between two circles, its width and both circumferences.
- Arc Length & Sector Area CalculatorFind the arc length, sector area, chord and segment area of a circle from its radius and central angle.
- Trig Functions CalculatorFind sin, cos, tan, csc, sec and cot of an angle in degrees or radians — or the inverse functions of a value.