Solve percentage, algebra, geometry, statistics and more — instantly. Free forever, no account needed, works on any device.
Calculate percentage of a number, percentage increase/decrease, find what percent one number is of another. 5 calculation modes in one tool.
Calculate mean, median, mode and range for any set of numbers. Enter values one by one or paste a comma-separated list for instant results.
Simplify ratios to lowest terms, solve missing values in proportions, and scale up or down any ratio. Perfect for recipes, maps and mixtures.
Add, subtract, multiply and divide fractions with full step-by-step working shown. Simplifies result and converts to mixed number automatically.
Calculate powers, square roots, cube roots and nth roots. Supports scientific notation and very large/small numbers with full precision.
Calculate log base 10, natural log (ln), log base 2, or any custom base. Shows antilog and all equivalent log identities.
A full-featured online scientific calculator with trig functions, log, factorial, memory, and expression history. Works entirely in your browser.
Solve any quadratic equation ax² + bx + c = 0. Shows discriminant, both real and complex roots, and full step-by-step working.
Solve one-variable and two-variable linear equations instantly. Shows graphical interpretation and complete algebraic steps for every solution.
Calculate nth term, sum of arithmetic and geometric sequences. Supports infinite geometric series convergence and Fibonacci sequence generation.
Add, subtract and multiply polynomials. Find roots using synthetic division and factor polynomials step-by-step up to degree 4.
Solve linear and quadratic inequalities with full working. Shows solution on number line, interval notation, and set builder notation.
Calculate area of 15+ shapes — circle, triangle, rectangle, square, trapezoid, parallelogram, ellipse, sector and more. Diagrams included.
Calculate perimeter and circumference of circles, rectangles, triangles, polygons and more. Perfect for fencing, framing and border calculations.
Calculate volume and capacity of 3D shapes — sphere, cylinder, cone, cube, cuboid, pyramid and more. Results in cm³, m³, litres and gallons.
Find hypotenuse or any missing side of a right-angled triangle. Also calculates all triangle angles, area and height. Step-by-step shown.
Solve any triangle given 3 known values — sides, angles or a mix. Uses Law of Sines, Law of Cosines and Heron's formula automatically.
Calculate radius, diameter, circumference and area of a circle from any one known value. Also finds arc length, chord and sector area.
Calculate distance, midpoint, slope, equation of a line and angle between two points. Perfect for coordinate geometry and analytic problems.
Calculate population and sample standard deviation, variance, mean, sum and count for any dataset. Shows full step-by-step derivation.
Calculate probability, combinations, permutations and conditional probability. Includes binomial and normal distribution probability finder.
Calculate z-score, find percentile rank using the standard normal distribution, and convert between raw scores and z-values with probability.
Calculate Pearson correlation coefficient (r) for two datasets. Shows scatter plot, strength of relationship, and R-squared value.
Calculate 90%, 95% or 99% confidence intervals for means and proportions. Shows margin of error, z-value and sample size recommendations.
Calculate all 6 trigonometric functions — sin, cos, tan, cosec, sec, cot — for any angle in degrees or radians with exact values for special angles.
Calculate arcsin, arccos, arctan, arccsc, arcsec and arccot. Find the angle from any trig ratio in degrees or radians instantly.
Convert between degrees, radians, gradians and turns instantly. Includes DMS (degrees-minutes-seconds) conversion and reference table.
Solve a right triangle completely — find all sides and angles from any 2 known values using SOHCAHTOA. Shows labelled diagram and all 6 trig ratios.
Find Highest Common Factor (HCF/GCD) and Lowest Common Multiple (LCM) for 2 or more numbers using prime factorisation and Euclidean algorithm.
Decompose any number into prime factors. Shows factor tree, prime factor list in exponential form, and checks whether a number is prime.
Convert numbers between binary, decimal, octal and hexadecimal. Also supports any custom base (2–36) with full step-by-step conversion shown.
Calculate factorial of any number up to 170. Also computes nCr (combinations) and nPr (permutations) with step-by-step expansion.
Convert any number (1–3,999,999) to Roman numerals and back. Shows the breakdown of each Roman symbol used with value explanation.