Geometry Calculators 2026 - Area, Volume, Circle, Polygon
What makes the geometry category useful
This category groups calculators that solve closely related real-world tasks, so you can move from a quick estimate to a more specific planning tool without restarting the process.
Find the area of circles, triangles, hexagons, octagons, parallelograms, and ellipses
Calculate volume of cubes, cylinders, prisms, pyramids, and rectangular tanks
Convert between radius, diameter, and circumference of any circle in one step
Calculate interior and exterior angles for any regular polygon up to 20 sides
See the geometric formula and the worked substitution beside every result
School and exam revision
Check area, perimeter, and volume answers with formulas you can copy into your written working.
Construction and DIY
Find the area or volume of rooms, slabs, tanks, and ducts before ordering materials.
Design and CAD prep
Calculate exact dimensions for hexagons, octagons, and pyramids when sketching layouts.
All Geometry Calculators
Circle Geometry Theorem Solver
Solve circle theorems step by step.
Polygon Angle Calculator
Find interior and exterior angles of any polygon.
Midpoint and Distance Calculator
Calculate distance and midpoint between two points.
Semicircle Calculator
Find semicircle area, perimeter, and equation.
Hexagonal Pyramid Calculator
Find hexagonal pyramid volume and surface area.
Hexagon Area Calculator
Regular hexagon area from side length.
Octagon Area Calculator
Regular octagon area from side length.
Pentagon Area Calculator
Regular pentagon area from side length.
Parallelogram Area Calculator
Parallelogram area from base and height.
Ellipse Area Calculator
Ellipse area from semi-major and semi-minor axes.
Circle Segment Area Calculator
Area between chord and arc.
Rectangular Prism Volume Calculator
Box volume from length, width, height.
Cube Volume Calculator
Cube volume and surface area from side.
Trapezoidal Prism Volume Calculator
Trapezoidal prism volume from bases and length.
Trapezoidal Prism Surface Area Calculator
Isosceles trapezoidal prism total surface area.
Annulus Area Calculator
Ring area between two concentric circles.
Hexagon Side Calculator
Hexagon side from area or perimeter.
Octagon Dimensions Calculator
All octagon dimensions from side length.
Ellipse Circumference Calculator
Find ellipse perimeter from semi-major and semi-minor axes.
Irregular Pentagon Area Calculator
Find area of any irregular five-sided polygon from coordinate points.
Irregular Hexagon Area Calculator
Find area of any irregular six-sided polygon from coordinate points.
Area of Shaded Region Circle Calculator
Find the shaded ring area between two concentric circles.
Circumference Calculator
Find circle circumference from radius or diameter instantly.
Diameter to Circumference Calculator
Convert diameter to circumference using C = pi x d.
Circumference to Diameter Calculator
Find diameter from a known circumference using d = C / pi.
Radius to Circumference Calculator
Calculate circumference from radius using C = 2 pi r.
Rectangle Volume Calculator
Find cubic volume of any rectangular box from three dimensions.
LxWxH Calculator
Multiply length x width x height to find cubic volume.
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How do I calculate the area of a circle?
Use pi times r squared. For a circle with radius 5, the area is pi times 25, which equals about 78.54 square units. The circle calculator handles diameter and circumference inputs too.
What is the formula for the volume of a cylinder?
Volume equals pi times radius squared times height. A cylinder with radius 4 and height 10 has a volume of pi times 16 times 10, which equals about 502.65 cubic units.
How do I find the interior angles of a regular hexagon?
Each interior angle equals (n minus 2) times 180 divided by n. For a hexagon with n = 6, each angle is (4 times 180) divided by 6, which equals 120 degrees.
How is the circumference of a circle calculated?
Circumference equals 2 times pi times r, or pi times d. A circle with radius 7 has a circumference of 2 times pi times 7, which equals about 43.98 units.
What is the difference between perimeter and circumference?
Perimeter is the total distance around any closed shape. Circumference is the specific term used for circles. Both measure boundary length but apply to different shape families.
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