Geometry

These tools work out the quantities of shapes and space. They solve a triangle from its sides and angles and give its area, calculate the area of plane figures and the volume of solids, handle vector dot and cross products, magnitude, and the angle between vectors, convert between angle, percent grade, and ratio for slopes, and derive the bearing and distance between two latitude and longitude points.

Triangle Calculator (Sides, Angles, Area)

Enter three sides (SSS), two sides and the included angle (SAS), or one side and its two adjacent angles (ASA), and calculate the remaining sides, angles, area, perimeter, circumradius, and inradius — plus the triangle's...

Area Calculator

Calculate the area of a square, rectangle, triangle, parallelogram, trapezoid, rhombus, circle, sector, or ellipse — just pick a shape and the formula does the rest.

Bearing & Distance Calculator (Latitude/Longitude)

Enter the latitude and longitude of two points to calculate the great-circle distance (via the Haversine formula) and the initial bearing (angle from true north) from the first point to the second.

Volume Calculator — Cube, Cylinder, Sphere & More

Free online volume calculator for 7 shapes: cube, rectangular prism, cylinder, sphere, cone, square pyramid, and triangular prism. Pick a shape to get the formula and result instantly, plus surface area for cylinders, sp...

Vector Calculator (Dot Product, Cross Product, Magnitude, Unit Vector, Angle)

Enter two 2D or 3D vectors to instantly calculate the dot product, cross product, magnitude (norm), unit vectors, and the angle between the two vectors — a free vector calculator.

Slope Calculator (Degrees, Percent Grade, Ratio)

Enter an angle in degrees, a percent grade, or a slope ratio (1:N) and instantly convert it to the other two formats. Free tool for roads, roofs, ramps, and railways.