Math

Enter an index n to get the Fibonacci number Fn, plus the neighboring terms, the golden-ratio approximation, and the recent sequence.

Find the area of a triangle from its base and height. The formula is area = base times height divided by 2, shown with a clear diagram of the triangle.

Enter the three sides a, b and c to compute the area of a triangle with Heron's formula. It also shows the perimeter and semi perimeter s, and draws the triangle to scale.

Find the area, perimeter, and diagonal of a square from its side, area, or diagonal.

Enter the height and width to instantly find a rectangle area, perimeter, and diagonal.

Find the area and midline of a trapezoid from its two bases and height.

Find the area of a rhombus from its two diagonals (p and q), or from a side and height. Side length, perimeter and diagonals are computed too.

Find the area of a parallelogram from its base and height. Enter both values and see the base times height result with a clear diagram.

Compute the area of a regular polygon from the number of sides and the side length, plus perimeter, apothem, circumradius and interior angle.

Calculate the area of a circle from its radius or diameter. Also shows circumference and diameter.

Find the area, arc length, and perimeter of a circular sector from its radius and central angle. Works in degrees and radians.

Find the area of an ellipse from its semi major axis a and semi minor axis b, plus its perimeter, eccentricity and focal distance.

Find the volume of a cube from its edge length, plus surface area, space diagonal, and total edge length.

Enter length, width, and height to find the volume of a rectangular box, plus its surface area and space diagonal.

Find the volume of a right circular cylinder from its radius and height (πr²h). Surface area, lateral area, base area and diameter are computed too.

Compute the volume of a right circular cone from its radius and height, plus slant height and surface area.

Find the volume of a sphere with V = 4/3 pi r cubed, plus surface area, diameter and great-circle circumference from the radius or diameter.

Divide a length by the golden ratio phi=(1+sqrt5)/2 about 1.618. Enter the whole, the longer part, or the shorter part to get the others and a golden rectangle diagram.

Enter an angle in degrees to instantly compute all six trigonometric ratios sin, cos, tan, csc, sec, and cot, plus the radian conversion, with a unit circle diagram.

Enter a number and a base to compute log_b(x). It also shows the natural log ln, common log log10, and binary log log2, with a curve graph.

Find the square root, cube root, and nth root of any number at once. Supports real roots of negative numbers with odd indices, with a graph.

Enter a base a and an exponent b to compute a to the power of b. Supports integers, decimals and negative exponents, and also shows the square, cube and reciprocal.

Enter a non-negative integer n to compute the factorial n! exactly, along with its digit count, Stirling approximation, and the previous factorial. Large values are shown in scientific notation.

Find the greatest common divisor (GCD) and least common multiple (LCM) of several integers using the Euclidean algorithm, with a step table and coprime check.

Enter a positive integer to get its prime factorization, plus the divisor count, divisor sum, full list of divisors, and a primality check.

Enter coefficients a and b to solve the linear equation ax+b=0. Get x=−b/a instantly, including the special cases when a is zero.

Solve a x²+b x+c=0 with the quadratic formula. The discriminant detects real, double, and complex roots, and the vertex, axis, and parabola graph are shown.

Compute the number of ways to choose r items from n without regard to order, with the related permutation and symmetry.

Calculate the permutation nPr, the number of ordered arrangements of r items chosen from n. Also shows nCr and n factorial.