77 FREE TOOLS · △
Geometry calculators
Areas, volumes and dimensions for common shapes.
Triangle
Find triangle sides, areas and perimeter from different known measurements.
Explore topic ↗12 calculatorsCircle & ellipse
Calculate curved areas, arcs, chords and circular borders.
Explore topic ↗17 calculatorsQuadrilateral & polygon
Measure areas and outlines of rectangles, kites and regular polygons.
Explore topic ↗29 calculatorsVolume & surface area
Find capacity and outside area for common three-dimensional shapes.
Explore topic ↗8 calculatorsCoordinate & vector
Calculate distances and vector relationships in two or three dimensions.
Explore topic ↗All geometry calculators
Circle Area Calculator
Calculate the area enclosed by a circle from its radius.
Circle Circumference Calculator
Find the distance around a circle using its radius.
Rectangle Area Calculator
Find the area of a rectangle from its length and width.
Rectangle Perimeter Calculator
Find the total length of the four sides of a rectangle.
Triangle Area Calculator
Calculate a triangle’s area using a base and perpendicular height.
Trapezoid Area Calculator
Find the area between a trapezoid’s parallel sides.
Parallelogram Area Calculator
Calculate area from the base and perpendicular height of a parallelogram.
Ellipse Area Calculator
Calculate the enclosed area of an ellipse using its two semi-axes.
Pythagorean Theorem Calculator
Find the hypotenuse of a right triangle from its two shorter sides.
Cuboid Volume Calculator
Calculate the volume of a rectangular box.
Cylinder Volume Calculator
Calculate a right circular cylinder’s volume from radius and height.
Cone Volume Calculator
Find a cone’s volume using its circular base radius and perpendicular height.
Sphere Volume Calculator
Find the volume enclosed by a sphere from its radius.
Sphere Surface Area Calculator
Calculate the outside surface area of a sphere.
Cylinder Surface Area Calculator
Find the total surface area of a closed right circular cylinder.
Sector Area Calculator
Calculate a circular sector’s area from radius and angle in degrees.
Arc Length Calculator
Find the length of a circular arc from radius and central angle.
Regular Polygon Interior Angle Calculator
Find each interior angle in a regular polygon.
Herons Formula Calculator
Find triangle area when all three side lengths are known.
Equilateral Triangle Area Calculator
Find the area of a triangle with three equal sides.
Triangle Perimeter Calculator
Add the side lengths of a valid triangle.
Right Triangle Leg Calculator
Recover a right triangle’s missing leg from the hypotenuse and another leg.
Annulus Area Calculator
Find the area of a ring between two concentric circles.
Circle Segment Area Calculator
Calculate the smaller circular segment cut off by a chord.
Chord Length Calculator
Find the straight chord connecting two points on a circle.
Regular Polygon Area Calculator
Find the area of a regular polygon from side count and side length.
Rhombus Area Calculator
Find a rhombus area using its diagonals.
Kite Area Calculator
Find the area of a simple kite from its perpendicular diagonals.
Cube Surface Area Calculator
Find the total outside area of a cube.
Cuboid Surface Area Calculator
Find the combined area of all six faces of a rectangular box.
Pyramid Volume Calculator
Find the volume of a pyramid from its base area and perpendicular height.
Cone Slant Height Calculator
Calculate the side length from base rim to tip of a right circular cone.
Cone Surface Area Calculator
Find a right circular cone’s base and curved area combined.
Conical Frustum Volume Calculator
Find the volume of a cone with its pointed top removed.
Ellipsoid Volume Calculator
Find ellipsoid volume from its three perpendicular semi-axes.
Torus Volume Calculator
Calculate the volume of a ring-shaped torus.
Three Dimensional Distance Calculator
Find the straight distance between two points in three-dimensional space.
Vector Dot Product Calculator
Calculate the dot product of two three-component vectors.
Square Area Calculator
Find the area enclosed by a square from one side measurement.
Square Diagonal Calculator
Find the corner-to-corner distance of a square.
Square Side From Area Calculator
Recover square side length from its enclosed area.
Rhombus Perimeter Calculator
Find the perimeter of a rhombus from one side.
Regular Polygon Perimeter Calculator
Find the outline length of a regular polygon.
Polygon Diagonal Count Calculator
Count all vertex-to-vertex diagonals in a polygon.
Polygon Interior Angle Sum Calculator
Find the sum of all interior angles in a simple polygon.
Regular Polygon Exterior Angle Calculator
Find the equal exterior turning angle of a regular polygon.
Regular Polygon Apothem Calculator
Find the inradius of a regular polygon from side length and side count.
Triangle Area From Two Sides Calculator
Find a triangle’s area from two sides and their included angle.
Triangle Altitude Calculator
Recover a triangle’s perpendicular height from area and base.
Triangle Inradius Calculator
Find the radius of a triangle’s inscribed circle from its side lengths.
Triangle Circumradius Calculator
Find the radius of the circle through all three triangle vertices.
Triangle Median Calculator
Find a triangle median length from its three side lengths.
Circle Radius From Area Calculator
Recover a circle’s radius from its enclosed area.
Circle Radius From Circumference Calculator
Recover a circle’s radius from its circumference.
Ellipse Perimeter Calculator
Estimate the circumference of an ellipse from its semi-axes.
Circular Sector Perimeter Calculator
Find the boundary length of a sector bounded by an arc and two radii.
Cube Volume Calculator
Find the volume enclosed by a cube from one edge.
Cube Space Diagonal Calculator
Find the longest corner-to-corner distance within a cube.
Hemisphere Volume Calculator
Find the volume of a hemisphere.
Hemisphere Surface Area Calculator
Find the combined curved and base surface area of a hemisphere.
Spherical Cap Volume Calculator
Find the volume cut from a sphere by a plane at a chosen cap height.
Spherical Cap Surface Area Calculator
Find the curved surface area of a spherical cap.
Triangular Prism Volume Calculator
Find the volume of a uniform triangular prism.
Torus Surface Area Calculator
Find the outside surface area of a ring-shaped torus.
Capsule Volume Calculator
Calculate the volume of a cylinder capped by two hemispheres.
Capsule Surface Area Calculator
Find the external area of a cylinder with hemispherical ends.
Hollow Cylinder Material Volume Calculator
Find material volume of a uniform hollow cylindrical tube.
Horizontal Cylinder Liquid Volume Calculator
Find partial fill volume from liquid depth in a horizontal cylindrical tank.
Frustum Slant Height Calculator
Find the sloping side length of a truncated cone.
Pyramid Lateral Area Calculator
Find side-face area of a regular pyramid.
Rectangular Pyramid Surface Area Calculator
Find the base and triangular-face areas of a centred rectangular pyramid.
Vector Magnitude Calculator
Find the length of a three-dimensional vector.
Angle Between Vectors Calculator
Find the unsigned angle between two nonzero 3D vectors.
Point to Line Distance Calculator
Find perpendicular distance from a point to a straight line.
Point to Plane Distance Calculator
Find perpendicular distance from a 3D point to a plane.
Vector Cross Product Calculator
Find the three components of the cross product of two 3D vectors.
Midpoint Calculator
Find the midpoint coordinates between two plane points.
Make your inputs count
Sketch the shape and mark the measurements before entering them. Keep every length in the same unit. Area results use that unit squared, while volume results use it cubed. Check whether a dimension is a radius, diameter, perpendicular height or sloping length.