Math
Everyday and advanced math: fractions, ratios, primes, statistics, roman numerals, equations and more.
Area Calculator
Find the area of a circle, square, rectangle, triangle, trapezoid, parallelogram, ellipse, sector or rhombus. Free and runs in your browser.
Arithmetic Sequence Calculator
Find the nth term, the sum of n terms and the full term list for any arithmetic or geometric sequence. Enter the first term, step or ratio, and n.
Average Calculator
Find the mean, median, mode, range, sum, count, min and max of a list of numbers. Paste values separated by commas, spaces or new lines.
Big Number Calculator
Add, subtract, multiply, divide, power, modulo, factorial, GCD and LCM on integers of any length. Exact results with no rounding, computed in your browser.
Circle Calculator
Enter any one circle property and get the radius, diameter, circumference and area instantly. Free, accurate and runs in your browser.
Complex Number Calculator
Add, subtract, multiply and divide complex numbers. Get the modulus, argument, conjugate and polar form of a + bi instantly. Free and private.
Confidence Interval Calculator
Calculate a confidence interval for a mean or proportion. Enter your sample stats and confidence level to get the interval, margin of error, and critical value.
Decimal to Fraction
Convert any decimal to a fraction online. Get the simplified fraction and the mixed number instantly, with negatives and whole numbers supported.
Descriptive Statistics Calculator
Get a full descriptive statistics summary from a list of numbers: mean, median, mode, variance, standard deviation, quartiles and the interquartile range.
Fibonacci Calculator
Find the nth Fibonacci number with full precision, list the sequence up to n, and see the golden ratio approximation. Exact results for large n using BigInt.
Fraction Calculator
Add, subtract, multiply or divide two fractions and get a fully simplified answer, the decimal value and the mixed number form. Free and instant.
Fraction to Decimal
Convert any fraction to a decimal instantly. Enter a numerator and denominator to see the exact value and whether the decimal terminates or repeats.
GCD and LCM Calculator
Find the greatest common divisor and least common multiple of a list of integers. Enter two or more numbers separated by commas or spaces.
GPA Calculator
Calculate your weighted GPA on the 4.0 scale. Add each course with its letter grade and credit hours to get your grade point average instantly.
Linear Equation System Solver
Solve a system of linear equations with 2 or 3 unknowns. Enter the coefficients and constants to get x, y and z, or detect no or infinite solutions.
Linear Regression Calculator
Fit a least squares line to your x and y data. Get the slope, intercept, equation, r-squared, and correlation, plus a scatter plot, in your browser.
Matrix Calculator
Add, subtract, multiply, transpose, and invert matrices online. Find determinants and scale by a scalar with editable grids and instant results.
Modular Exponentiation Calculator
Compute base^exponent mod m with big integers, fast. Also find modular inverses and the GCD. Negative exponents supported when the base is invertible.
Number Base Converter
Convert numbers between any base from 2 to 36, including binary, octal, decimal and hex. Handles huge numbers exactly with arbitrary precision. Free, private.
Number to Words
Convert numbers to written words instantly. Spell out whole numbers or write a cheque amount in dollars and cents, then copy the result. Free and private.
Permutation and Combination Calculator
Calculate permutations (nPr) and combinations (nCr) for choosing r items from n. See both results with the formulas and factorials, updated live.
Polynomial Calculator
Add, subtract, multiply, differentiate and integrate polynomials, evaluate them at a value and read the degree. Enter coefficients and get a clean result.
Prime Factorization Calculator
Break any whole number into its prime factors. Get the factorization in exponent form like 2^3 x 3^2 x 5, a factor table, and whether the number is prime.
Prime Number Checker
Check if a number is prime and see its full prime factorization and all divisors. Enter any whole number and get an instant answer.
Probability Distribution Calculator
Compute binomial, normal, and Poisson probabilities. Get PMF or PDF, cumulative CDF, plus mean and variance, updated live as you type.
Pythagorean Theorem Calculator
Find the missing side of a right triangle with a squared plus b squared equals c squared. Get the legs, hypotenuse, area and perimeter instantly.
Quadratic Equation Solver
Solve any quadratic equation ax^2 + bx + c = 0. Enter the coefficients to get the real or complex roots, the discriminant and the vertex.
Ratio Calculator
Solve a proportion A:B = C:D by leaving one value blank, or simplify a ratio to its lowest terms. Free, fast and works in your browser.
Roman Numeral Converter
Convert numbers to Roman numerals and Roman numerals to numbers. Type a number from 1 to 3999 or a Roman numeral and copy the result. Free and private.
Scientific Notation Converter
Convert numbers to and from scientific notation and E notation. Enter a number or a value like 1.23 x 10^4 to see the standard decimal form. Free and private.
Set Calculator
Calculate the union, intersection, difference, and symmetric difference of two sets. Check subset and disjoint relationships. Free and instant.
Significant Figures Calculator
Count the significant figures in any number and round to a set number of sig figs. See which digits count and why, with scientific notation. Free and private.
Slope Calculator
Find the slope, y-intercept, line equation, distance, midpoint and angle from two points. Enter two coordinates and read every value instantly.
Standard Deviation Calculator
Calculate standard deviation and variance online. Paste a list of numbers to get the mean, count, and both sample and population results instantly.
Triangle Calculator
Find a triangle's area from base and height or from three sides with Heron's formula, and solve right triangles with the Pythagorean theorem.
Truth Table Generator
Generate a truth table from any boolean expression. Supports AND, OR, NOT, XOR, NAND, NOR, XNOR, IMPLIES and IFF. Runs in your browser.
Vector Calculator
Add, subtract, scale, and find the dot and cross product of 2D and 3D vectors. Get magnitude, unit vector, angle, distance, and projection instantly.
Volume Calculator
Find the volume of a cube, box, sphere, cylinder, cone, pyramid, ellipsoid or capsule. Enter the dimensions and get the volume and surface area instantly.
Z-Score Calculator
Calculate a z-score from a value, mean, and standard deviation. See the percentile and two-tailed p-value, with a plain-English reading of the result.