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All-in-One Calculator
Standard and scientific in one place — memory keys, calculation history and full keyboard support. The fastest way to crunch a quick number without picking a specialised tool.
Open tool NewStep-by-Step Solvers
Multi-step analyzers that work the whole problem, not just one formula — the Quadratic Function Analyzer, Triangle Solver and Descriptive Statistics Analyzer, each with every stage shown.
Open toolPercentage Calculator
Answer the three common percentage questions: what is X% of Y, X is what percent of Y, and the percent increase or decrease from one number to another.
Open tool FreePercentage Increase Calculator
Percentage increase, decrease and change between two values — or increase a number by a percent — with the working shown.
Open tool FreeFraction Calculator
Add, subtract, multiply, divide and simplify fractions and mixed numbers — with the answer as a reduced fraction and a decimal, plus the working.
Open tool FreeMixed Number Calculator
Add, subtract, multiply and divide two mixed numbers, or convert a mixed number to an improper fraction — with the answer as a mixed number, an improper fraction and a decimal.
Open tool FreeRatio Calculator
Simplify a ratio to lowest terms or solve a proportion a:b = c:d for a missing value, with the working shown at every step.
Open tool FreeRatio to Fraction Calculator
Convert a ratio to a fraction in lowest terms — a:b becomes a/b with its decimal and percentage, and multi-part ratios give each part as a fraction of the whole.
Open tool FreeProportion Calculator
Solve for the missing value in a proportion (a/b = c/d) using cross-multiplication, with each step of the algebra shown.
Open tool FreeRounding Calculator
Round any number to the nearest place, decimal or significant figure, with half-up, banker's, ceiling, floor and truncate modes — and see which digit decided.
Open tool FreeLong Division Calculator
Divide two numbers the long way, with the full step-by-step bring-down process and the quotient plus remainder shown.
Open tool FreeGCF Calculator
Find the greatest common factor of two or more numbers, with every Euclidean-algorithm reduction step shown.
Open tool FreeLCM Calculator
Find the least common multiple of two or more numbers, using the GCF relationship with every pairwise reduction step shown.
Open tool FreePEMDAS Calculator
Solve any expression in the correct order of operations (PEMDAS / BODMAS), one step at a time, with parentheses, exponents and roots.
Open tool FreeScientific Notation Calculator
Convert any number to scientific, E- and engineering notation — or add, subtract, multiply and divide in scientific notation, with the steps explained.
Open tool FreeSignificant Figures Calculator
Count the significant figures in a number and round any value to a chosen number of sig figs, with the rules applied.
Open tool FreeDecimal to Fraction Calculator
Convert a terminating decimal to an exact fraction in lowest terms, with the mixed-number form.
Open tool FreeFraction to Decimal Calculator
Convert a fraction to its decimal form and find out whether it terminates or repeats.
Open tool FreeSimplify Fractions Calculator
Reduce a fraction to lowest terms by dividing by the greatest common divisor.
Open tool FreePrime Factorization Calculator
Break a whole number into its prime factors, shown in exponent form.
Open tool FreeModulo Calculator
Remainder and modulo of a ÷ n, with the quotient and a non-negative form.
Open toolInequality Calculator
Solve a linear or quadratic inequality, with the solution in interval notation and on a number line.
Open tool FreeGraphing Calculator
Plot multiple functions of x on an interactive, zoomable graph with a live coordinate readout.
Open tool FreeDomain and Range Calculator
Find the domain and range of a function in interval notation, shown on a graph.
Open tool FreeVertex Calculator
Vertex, axis of symmetry, minimum or maximum and vertex form of a parabola.
Open tool FreeParabola Calculator
Vertex, axis of symmetry, focus, directrix and intercepts of a parabola.
Open tool FreeQuadratic Formula Calculator
Solve any quadratic equation ax² + bx + c = 0 for real or complex roots, with the discriminant and every step of the formula shown.
Open tool FreeFactoring Calculator
Factor a polynomial over the rationals — GCF, difference of squares, trinomials, and higher-degree via the rational-root theorem, with every step shown.
Open tool FreePolynomial Calculator
Add, subtract, multiply, or divide two polynomials — like terms collected, products expanded, and long division with a quotient and remainder.
Open tool FreeSystem of Equations Solver
Solve a system of two linear equations with two unknowns using Cramer's rule, with the determinant and every step shown.
Open tool FreeWord Problem Solver
Turn a linear "find the number" word problem into an equation and solve it step by step — like "10 added to four times a number is 46".
Open tool FreeExponent Calculator
Raise any base to any power, including negative and fractional exponents, with step-by-step working.
Open tool FreeSquare Root Calculator
Square root of any number as a decimal and, for whole numbers, in simplified radical form like 6√2.
Open tool FreeSummation (Σ) Calculator
Evaluate a sigma-notation summation of a series in k over an index range, with the terms expanded.
Open tool FreeAbsolute Value Calculator
Absolute value of a number, or solve an absolute-value equation |ax + b| = c with the two-case working.
Open tool FreeSynthetic Division Calculator
Divide a polynomial by a linear factor x − r using synthetic division; quotient and remainder shown.
Open tool FreeCube Root Calculator
Cube root of any number as a decimal and, for whole numbers, in simplified radical form.
Open tool FreeDiscriminant Calculator
Discriminant b² − 4ac of a quadratic and how many real roots it has.
Open tool FreeCompleting the Square Calculator
Rewrite a quadratic ax² + bx + c in vertex form a(x − h)² + k.
Open tool FreeInterpolation Calculator
Linear interpolation to estimate a value between two known points.
Open tool FreeScientific Calculator
Trigonometry, logarithms, powers, roots, factorial, constants and memory — in degrees or radians, with full keyboard support and no sign-up.
Open tool FreeLog Calculator
Calculate a logarithm in any base, including log base 10, natural log (ln) and log base 2, with the change-of-base formula shown.
Open tool FreeExponential Function Calculator
Evaluate f(x) = a·bx for any base — including ex, 2x and 10x — graph the curve, mark the point, and see growth or decay.
Open tool FreeFactorial Calculator
Calculate n! for any non-negative integer, with the full multiplication chain shown for small numbers and fast results for large ones.
Open tool FreePermutation Calculator (nPr)
Count the ordered arrangements of r items chosen from n, computed exactly with the formula shown.
Open tool FreeCombination Calculator (nCr)
Count the ways to choose r items from n when order does not matter, computed exactly with the formula shown.
Open tool FreeDerivative Calculator
Differentiate any function of x and see f′(x) with the power, product, quotient, and chain rules shown, plus a graph of f and f′.
Open tool FreeIntegral Calculator
Integrate any function: the indefinite integral (antiderivative) with steps, or a definite integral and the area under the curve between two limits.
Open tool FreePartial Derivative Calculator
Partial derivative with respect to any variable and the full gradient of a multivariable function, with the rules shown.
Open tool FreeTaylor Series Calculator
Expand a function as a Taylor or Maclaurin series to any order about any center, with each term and an approximation plot.
Open tool FreeComplex Number Calculator
Add, subtract, multiply, divide complex numbers in rectangular, polar and exponential form, plus powers and roots.
Open tool FreeLimit Calculator
Find the limit of a function as x approaches a value or infinity, with one-sided values, a table of approaching values, and a graph.
Open tool FreeArithmetic Sequence Calculator
nth term and sum of an arithmetic sequence from the first term, common difference and count.
Open tool FreeGeometric Sequence Calculator
nth term, partial sum and infinite sum of a geometric sequence.
Open tool FreeBinomial Coefficient Calculator
C(n, k) “n choose k” computed exactly, with the matching row of Pascal’s triangle.
Open toolCircle Area Calculator
Find the area, circumference, diameter or radius of a circle from any one measurement, with the formula and steps shown.
Open tool FreeSphere Surface Area Calculator
Find the surface area, volume, radius or diameter of a sphere from any one measurement, with the formula and steps shown.
Open tool FreePolygon Area Calculator
Find the area of any polygon — an irregular shape from its coordinates (shoelace formula), a triangle from three sides (Heron), or a regular polygon from its side length.
Open tool FreeVolume Calculator
Volume of a cube, box, sphere, cylinder, cone or pyramid, with surface area and the formula shown.
Open tool FreeSurface Area Calculator
Surface area of a cube, box, sphere, cylinder, cone or pyramid, with volume and the formula shown.
Open tool FreeDistance Formula Calculator
Distance between two points in the plane, with the horizontal and vertical differences.
Open tool FreeArea of a Triangle Calculator
Triangle area from base and height, three sides (Heron), or the coordinates of its vertices.
Open tool FreePythagorean Theorem Calculator
Find a missing side of a right triangle from the other two, using a² + b² = c², with every step of the formula shown.
Open tool FreeMidpoint Calculator
Find the midpoint and the distance between two coordinates, with the midpoint and distance formula steps shown.
Open tool FreeSlope Calculator
Find the slope of a line from two points (rise over run), plus the angle of incline, the equation y = mx + b, the distance, and the midpoint.
Open tool FreeLaw of Cosines Calculator
Find a triangle side (SAS) or all three angles (SSS) with the law of cosines.
Open tool FreeLaw of Sines Calculator
Find a triangle side (AAS) or an angle (SSA) with the law of sines, including the ambiguous case.
Open toolDeterminant Calculator
Find the determinant of a square matrix by cofactor expansion or row reduction.
Open tool FreeMatrix Inverse Calculator
Invert a matrix with exact fractions via Gauss-Jordan elimination, every step shown.
Open tool FreeMatrix Multiplication Calculator
Multiply two matrices with the dot-product working shown for every cell.
Open tool FreeMatrix Rank Calculator
Find the rank of a matrix and its row-echelon form.
Open tool FreeMatrix Equation Solver
Solve a system Ax = b for any n×n matrix with the full elimination shown.
Open tool FreeMatrix Transpose Calculator
Transpose any matrix, swapping its rows and columns.
Open tool FreeEigenvalue Calculator
Eigenvalues of a 2×2 or 3×3 matrix from the characteristic equation, with trace and determinant.
Open tool FreeEigenvector Calculator
Eigenvectors of a 2×2 or 3×3 matrix for each real eigenvalue, unit-normalized, with the steps shown.
Open tool FreeDot Product Calculator
Dot product of two vectors of any dimension, with their magnitudes and the angle between them.
Open tool FreeCross Product Calculator
Cross product of two 3-D vectors — the perpendicular vector and its magnitude, with the formula.
Open toolAverage Calculator
Add any list of numbers and get the average (mean) instantly, with the steps shown.
Open tool FreeMean, Median, Mode Calculator
Find the mean, median, mode and range of a data set at once, with the working for each shown.
Open tool FreeStandard Deviation Calculator
Find the population or sample standard deviation of a data set, with the mean, variance and every step shown.
Open tool FreeVariance Calculator
Calculate population or sample variance, with the mean, standard deviation and every step shown.
Open tool FreeZ-Score Calculator
Find the standard score of a value — how many standard deviations it sits from the mean — with the formula shown.
Open tool FreeProbability Calculator
Probability of a single event with complement and odds, plus AND/OR of two independent events.
Open tool FreePercentile Calculator
Percentile rank of a value in a data set, or the value at a given percentile, with steps.
Open tool FreeCorrelation Coefficient Calculator
Pearson correlation coefficient r for paired data, with r-squared and a strength interpretation.
Open tool FreeConfidence Interval Calculator
Confidence interval for a mean from the sample mean, standard deviation and size, with margin of error.
Open tool FreeNormal Distribution Calculator
Probabilities under a normal (Gaussian) distribution, with the bell curve shaded.
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