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Free online geometry calculators. Fast, accurate, and always free to use.
Use our free circle calculator to find the area, circumference, radius, and diameter of a circle. Enter any one known value and instantly get all the other measurements.
Use our free triangle calculator to find the area of any triangle. Enter the base and height and get the area instantly using the formula A = ½ × b × h.
Use our free right triangle calculator to compute the hypotenuse, area, and perimeter of a right triangle. Enter the lengths of the two legs and get instant results.
Use our free Pythagorean theorem calculator to find the missing side length of a right triangle. Enter any two side lengths and instantly compute the third using a² + b² = c².
Use our free rectangle calculator to find the area, perimeter, and diagonal of any rectangle. Enter the width and height and get all measurements instantly.
Use our free square calculator to compute the area, perimeter, and diagonal of a square. Enter the side length and get all measurements instantly.
Use our free trapezoid calculator to find the area of a trapezoid. Enter the lengths of the two parallel bases and the perpendicular height.
Use our free rhombus calculator to compute the area and perimeter of any rhombus. Enter the lengths of the diagonals and the side.
Use our free kite calculator to find the area of any kite. Enter the lengths of the two diagonals and get the area instantly.
Use our free pentagon calculator to compute the area and perimeter of a regular pentagon. Enter the side length and get instant results.
Use our free hexagon calculator to compute the area and perimeter of a regular hexagon. Enter the side length and get results instantly.
Use our free octagon calculator to compute the area and perimeter of a regular octagon. Enter the side length and get results instantly.
Use our free regular polygon calculator to compute the area and perimeter of any regular polygon. Enter the number of sides and side length.
Use our free area calculator to find the area of common shapes. Select a shape type, enter the dimensions, and get the area instantly.
Use our free perimeter calculator to find the perimeter of common shapes. Select a shape type, enter the dimensions, and get the perimeter instantly.
Use our free surface area calculator to compute the surface area of common 3D shapes. Select a shape and enter dimensions.
Use our free volume calculator to compute the volume of common 3D shapes. Select a shape and enter dimensions.
Use our free sphere calculator to compute the surface area and volume of a sphere. Enter the radius.
Use our free cylinder calculator. Enter radius and height for surface area and volume.
Use our free cone calculator. Enter radius and height for surface area and volume.
Use our free cube calculator to compute surface area and volume from the side length.
Use our free prism calculator to find the volume of any prism by entering base area and height.
Use our free pyramid calculator to find the volume of any pyramid from base area and height.
Use our free ellipse calculator to find the area of an ellipse.
Use our free sector calculator for the area and arc length of a circle sector.
Use our free arc length calculator to find the length of a circular arc.
Use our free chord length calculator to find the length of a chord in a circle.
Addition, subtraction, multiplication, and division calculators.
Simplify, compare, and calculate with fractions.
Decimal conversion, rounding, and arithmetic calculators.
Calculate powers, square roots, and nth roots.
Solve equations, inequalities, and algebraic expressions.
Sine, cosine, tangent, and trigonometric functions.
Mean, median, mode, standard deviation, and more.
Prime numbers, factorization, factors, multiples, and LCM calculators.
Binary, decimal, and hexadecimal converters and arithmetic.
Arithmetic and geometric sequences and series.
Matrix operations, determinants, and inverses.
Derivatives, integrals, and limits calculators.
Complex number arithmetic and conversions.
Vector operations, eigenvalues, and linear systems.
Round numbers to specified precision and significant figures.
Odd math tools and general-purpose calculators.