Math.

What is X% of Y, X is what % of Y, and percentage change — all in one place.

Percentage increase or decrease between two numbers.

Add, subtract, multiply, or divide two fractions and simplify the result.

Simplify a ratio or solve A:B = C:? for a missing term.

Solve A/B = C/D for the missing value.

Evaluate a math expression with +, −, ×, ÷, ^, sqrt, sin, cos, tan, log, ln, and π.

Solve ax² + bx + c = 0 for real or complex roots.

Slope, y-intercept, distance, angle, and equation of a line through two points.

Euclidean distance between two points in 2D or 3D space.

Area of common shapes: rectangle, triangle, circle, trapezoid, parallelogram, ellipse.

Mean, variance, and standard deviation (sample or population) of a dataset.

Central tendency measures for any list of numbers.

Z-score of a value in a normal distribution, plus its cumulative probability.

Union, intersection, and complement of two events (assumes independence for A ∩ B).

Compute nPr (arrangements) and nCr (selections) for two integers n and r.

Greatest common divisor and least common multiple of two integers.

Given three sides, compute area (Heron's), perimeter, all interior angles, height, and classify the triangle.

Solve a right triangle given any two of: leg a, leg b, hypotenuse c, or an acute angle.

Solve for the hypotenuse or a missing leg using c² = a² + b².

Enter any one of radius, diameter, circumference, or area — get all four.

Volume of common 3D shapes: cube, box, sphere, cylinder, cone, square pyramid, and capsule.

Total surface area of common 3D shapes: cube, box, sphere, cylinder, and cone.

Raise a base to any exponent — negative, fractional, or large — with scientific notation for extremes.

Compute log_b(x) for any positive base — 10, e (natural), 2, or a custom base.

Compute the nth root of any number — square root, cube root, or any real n.

Round a number to a decimal place or to the nearest ten, hundred, thousand — with floor and ceiling too.

Convert a decimal to scientific notation (m × 10ⁿ) and e-notation, or parse a scientific string back.

Exact arithmetic on very large integers using BigInt — beyond regular double-precision limits.

Compare an observed value to a true value and get percent error plus absolute error.

Mean, sum, count, min, max, and geometric mean for any list of numbers.

Add, subtract, multiply, transpose, or find the determinant of 2×2 or 3×3 matrices.

Convert between decimal and binary or perform binary arithmetic (add, subtract, multiply).

Convert freely between hexadecimal, decimal, and binary.

Compute a confidence interval for a sample mean using the z-distribution.

Find the sample size needed for a survey given confidence, margin of error, and expected proportion.

Convert a z-score to a p-value for one- or two-tailed tests with significance verdict.

Factor any integer up to 10¹² into its prime components with exponents.

List every positive divisor of an integer plus divisor count, sum, and perfect-number check.

Solve for remaining quantity, half-life, or elapsed time in exponential decay.

Find the GCF and LCM of any list of integers, plus a simplified ratio for the first two.

Divide integers to get quotient, remainder, mixed-number form, and decimal expansion.

Generate a strong deterministic password with configurable length, character sets, and entropy readout.