Geometry and Algebra100% Free16 tools

Free Geometry and Algebra Calculators

Find the area, volume, perimeter and angles of common shapes from one or two measurements, convert decimals and fractions, simplify radicals and solve pairs of equations. Everything runs in your browser.

Shapes

Circle CalculatorFind radius, diameter, circumference and area from any one. Sphere CalculatorRadius, surface area and volume of a sphere from any one value. Cylinder CalculatorVolume and surface area of a cylinder, with litres. Cone CalculatorVolume, slant height and surface area of a cone. Regular Polygon CalculatorArea, perimeter, apothem and angles of a regular polygon. Arc Length CalculatorArc length, sector area, chord and segment from radius and angle. Ellipse CalculatorArea, perimeter, eccentricity and foci of an ellipse. Trapezoid CalculatorArea, median and perimeter of a trapezoid. Rhombus CalculatorArea, side, perimeter and angles of a rhombus. Rectangle CalculatorArea, perimeter, diagonal and ratio of a rectangle. Cube and Box CalculatorVolume, surface area and diagonals of a cube or box. Pyramid CalculatorVolume, slant height and surface area of a square pyramid.

Number conversion

Decimal to Fraction ConverterConvert a decimal to an exact fraction and simple approximations. Fraction to Decimal ConverterConvert fractions to decimals and percent, with repeating digits. Simplify Radical CalculatorWrite square, cube and other roots in simplest form.

Algebra

System of Equations SolverSolve two linear equations with two unknowns.

How These Geometry Tools Work

Every calculator on this site runs in your browser with JavaScript. The numbers you enter are processed on your own device. They are not uploaded or stored, and no outside service is used. Each tool shows its formulas, and uses the exact value of pi.

Which Tool Should I Use?

Round shapes: the circle, sphere, cylinder, cone, arc length and ellipse calculators.
Flat shapes: the rectangle, trapezoid, rhombus and regular polygon calculators.
Solids with flat faces: the cube and box calculator and the pyramid calculator.
Numbers and algebra: decimal to fraction, fraction to decimal, simplify radicals and the system of equations solver.

More free tools: math calculators (area, volume, triangle, quadratics), unit converters and statistics tools. For the theory, see the Wikipedia article on geometry.