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Popular Geometry Tools workflows

Direct links to four high-demand tools in this category.

Right Triangle CalculatorCircle Equation CalculatorCylinder Surface Area CalculatorArc Length Calculator
42 geometry tools

Geometry Tools

Free browser-based geometry calculators for triangles, circles, polygons, area, perimeter, volume, surface area, coordinate centers, similarity, and common 3D solids.

Known values → solve → check → reuse

Start from the sides, angles, coordinates, radius, or dimensions you actually know. Use the broad heads for common jobs, then move to a specialist when the problem is similarity, coordinate centers, circle equations, arcs, or a particular solid.

Solve triangles

Solve general and right triangles, compare similar triangles, and calculate classical centers from coordinates.

Triangle CalculatorEnter the known measurements and press Solve triangle. Results and the diagram stay hidden until you calculate.Right Triangle CalculatorEnter two supported measurements, review the solved triangle, then move to Pythagorean, general-triangle, area, or similarity tools.Pythagorean Theorem CalculatorLeave exactly one of a, b, or c blank. The calculator solves the missing side, validates the hypotenuse relationship, and shows a labeled right-triangle diagram plus supporting geometry.Triangle Area CalculatorEnter the base and perpendicular height to get the triangle area.Similar Triangles CalculatorEnter a matching side pair to scale another triangle, or compare two complete side sets with an SSS similarity check and transparent proportional ratios.Triangle Centers CalculatorEnter three non-collinear coordinate points to calculate the four classical triangle centers, area, perimeter, inradius, circumradius, and an SVG position sketch.

Circles, arcs & curved regions

Move between radius/diameter/circumference/area, solve coordinate equations, or work with sectors, arcs and rings.

Circle CalculatorChoose the circle value you know, solve the rest, and use the specialist circle-equation or arc/sector tools when coordinates or angles are part of the problem.Circle Area CalculatorEnter a radius to calculate circle area and circumference instantly.Circle Equation CalculatorUse three non-collinear points or x² + y² + Dx + Ey + F = 0 to solve the circle center, radius, equation forms, area, and circumference.Circle Sector CalculatorEnter a radius and angle in degrees to calculate the circular sector.Arc Length CalculatorEnter a circle radius and central angle in degrees to calculate arc length.Annulus CalculatorEnter outer and inner radii to calculate the geometry of an annulus.Interactive Unit CircleChoose standard angles in degrees or radians, inspect the coordinate point, and view exact trigonometric values on an interactive unit circle.

Polygons & 2D shapes

Calculate area, perimeter, diagonals and regular-shape properties, or handle irregular coordinate polygons.

Area CalculatorChoose the shape and enter consistent linear units; square-unit results follow automatically, while specialist calculators provide shape-specific secondary measurements.Perimeter CalculatorChoose a rectangle, square, triangle, circle, or regular polygon and calculate its perimeter instantly.Rectangle Area CalculatorEnter length and width to calculate rectangular area.Trapezoid CalculatorEnter two parallel bases and height to calculate trapezoid area; add leg lengths for perimeter.Parallelogram CalculatorEnter base, side length, and height to calculate area and perimeter.Rhombus CalculatorEnter the two diagonals to calculate area and derive the side length and perimeter.Ellipse CalculatorEnter the two semi-axis lengths to calculate ellipse area and a Ramanujan perimeter approximation.Regular Polygon CalculatorEnter n ≥ 3 and one side length to solve the standard regular-polygon relationships; irregular polygons require coordinate or decomposition methods instead.Irregular Polygon Area CalculatorPaste x,y vertices in boundary order to calculate irregular polygon area with the shoelace formula, plus perimeter and bounding dimensions.

Volumes & surface areas

Solve common solids and connect volume to surface-area, slant-height and diagonal workflows.

Volume CalculatorChoose a solid, enter dimensions in one consistent length unit, and read volume in the corresponding cubic unit; use shape specialists for slant heights, diagonals, or other secondary values.Surface Area CalculatorChoose a cube, rectangular prism, cylinder, cone, or sphere and calculate total surface area with the formula shown.Sphere Volume CalculatorEnter radius to calculate sphere volume using 4/3 × π × r³.Cylinder Volume CalculatorEnter radius and height to calculate πr²h.Cone Volume CalculatorEnter radius and height to calculate one-third πr²h.Rectangular Prism CalculatorEnter length, width, and height to solve a rectangular prism.Square Pyramid CalculatorEnter base side and vertical height to solve a right square pyramid.Conical Frustum Volume CalculatorEnter bottom radius, top radius, and vertical height to calculate conical frustum volume, slant height, and surface area.Spherical Cap CalculatorEnter sphere radius and cap height to solve the cap geometry with the valid 0 < h ≤ 2R domain shown explicitly.

All Geometry Tools

Geometry Tools

Volume Calculator

Calculate volume for common 3D solids and connect to surface-area and shape-specific geometry calculators.

Geometry Tools

Circle Area Calculator

Calculate the area and circumference of a circle from its radius.

Geometry Tools

Triangle Area Calculator

Calculate triangle area from base and height.

Geometry Tools

Pythagorean Theorem Calculator

Solve any missing side of a right triangle and inspect the theorem visually with area, perimeter, acute angles, formula substitution, and common triples.

Geometry Tools

Rectangle Area Calculator

Calculate rectangle area from length and width.

Geometry Tools

Rectangle Perimeter Calculator

Calculate rectangle perimeter from length and width.

Geometry Tools

Sphere Volume Calculator

Calculate the volume of a sphere from its radius.

Geometry Tools

Cylinder Volume Calculator

Calculate cylinder volume from radius and height.

Geometry Tools

Cone Volume Calculator

Calculate cone volume from radius and height.

Geometry Tools

Cube Volume Calculator

Calculate the volume of a cube from its side length.

Geometry Tools

Sphere Surface Area Calculator

Calculate the surface area of a sphere.

Geometry Tools

Triangle Calculator

Solve SSS, SAS, ASA/AAS, or SSA triangles from an explicit Solve action, then inspect the scaled diagram and measurements.

Geometry Tools

Surface Area Calculator

Calculate surface area for common 3D shapes.

Geometry Tools

Perimeter Calculator

Calculate perimeter or circumference for common 2D shapes.

Geometry Tools

Area Calculator

Calculate area for common 2D shapes with connected shape-specific calculators for deeper dimensions, perimeter, and formula context.

Geometry Tools

Interactive Unit Circle

Explore common unit-circle angles with exact and decimal sine, cosine, and tangent values.

Geometry Tools

Circle Calculator

Solve radius, diameter, circumference, and area from one known circle measurement, with connected equation, sector, arc, and annulus tools.

Geometry Tools

Right Triangle Calculator

Solve a right triangle from two known measurements and connect its sides, angles, area, and perimeter to the wider geometry workflow.

Geometry Tools

Trapezoid Calculator

Calculate trapezoid area, midsegment, and perimeter from its bases, height, and optional legs.

Geometry Tools

Parallelogram Calculator

Calculate parallelogram area and perimeter from base, side, and perpendicular height.

Geometry Tools

Rhombus Calculator

Calculate rhombus area, side length, and perimeter from its diagonals.

Geometry Tools

Ellipse Calculator

Calculate ellipse area, approximate perimeter, and eccentricity.

Geometry Tools

Regular Polygon Calculator

Solve a regular polygon from side count and side length, including area, perimeter, apothem, circumradius, and regular angles.

Geometry Tools

Polygon Interior Angle Calculator

Calculate the sum of interior angles and each regular interior or exterior angle.

Geometry Tools

Circle Sector Calculator

Calculate sector area, arc length, and perimeter from radius and central angle.

Geometry Tools

Arc Length Calculator

Calculate circular arc length from radius and central angle.

Geometry Tools

Annulus Calculator

Calculate ring area, width, and inner and outer circumferences.

Geometry Tools

Rectangular Prism Calculator

Calculate rectangular-prism volume, surface area, lateral area, and space diagonal.

Geometry Tools

Triangular Prism Calculator

Calculate triangular-prism volume and surface area from three base sides and prism length.

Geometry Tools

Square Pyramid Calculator

Calculate square-pyramid volume, slant height, lateral area, and total surface area.

Geometry Tools

Cone Surface Area Calculator

Calculate cone lateral area, total surface area, slant height, and volume.

Geometry Tools

Cylinder Surface Area Calculator

Calculate cylinder lateral area, total surface area, base area, and volume.

Geometry Tools

Hemisphere Calculator

Calculate hemisphere volume, curved surface area, total surface area, and base area.

Geometry Tools

Composite Area Calculator

Add and subtract simple shape areas to calculate a composite figure.

Geometry Tools

Irregular Polygon Area Calculator

Calculate polygon area and perimeter from ordered coordinate points.

Geometry Tools

Ellipsoid Volume Calculator

Calculate ellipsoid volume from three semi-axis lengths.

Geometry Tools

Conical Frustum Volume Calculator

Calculate the volume of a truncated cone from two radii and height.

Geometry Tools

Capsule Volume Calculator

Calculate capsule volume from radius and straight cylinder length.

Geometry Tools

Similar Triangles Calculator

Find a scale factor, missing corresponding sides, perimeter ratio, and area ratio for similar triangles, or check SSS similarity.

Geometry Tools

Triangle Centers Calculator

Calculate the centroid, circumcenter, incenter, orthocenter, inradius, and circumradius from three triangle vertices.

Geometry Tools

Circle Equation Calculator

Find a circle center, radius, standard equation, and general equation from three points or general-form coefficients.

Geometry Tools

Spherical Cap Calculator

Calculate spherical-cap volume, curved area, base radius, base area, and total surface area from sphere radius and cap height.

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