Math
Free Math calculators with instant results, clear explanations and worked examples — no sign-up, available in 9 languages.
All Math calculators
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Exponential Growth & Decay Calculator — Doubling Time & Half-Life
Project exponential growth or decay with the continuous N₀·e^{kt} or discrete N₀·(1±r)^t model. Get the value at any time, doubling time or half-life, and a plotted curve.
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Fraction Calculator — Add, Subtract, Multiply & Divide with Steps
Add, subtract, multiply and divide fractions and mixed numbers with the LCM common-denominator steps shown, plus the simplified, mixed and decimal results and pie visuals.
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Matrix Calculator — Determinant, Inverse, Multiply & Transpose
Add, subtract, scalar-multiply, multiply, transpose, and find the determinant and inverse of matrices up to 3×3 — with the result laid out and a magnitude heatmap.
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Percentage Calculator — % of a number, % change, % difference
Free percentage calculator: find X% of Y, what percent one number is of another, percentage increase or decrease, difference, and add or subtract a percent.
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Permutations & Combinations Calculator — nPr, nCr with Steps
Compute permutations (nPr) and combinations (nCr), plus the with-repetition variants, with factorial expansions and a Pascal’s-triangle view. Free nPr/nCr calculator.
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Prime Factorization Calculator — Factor Tree, GCF & LCM
Find the prime factorization of one or two numbers with an interactive factor tree, the exponential form, and the greatest common factor (GCF) and least common multiple (LCM).
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Quadratic Equation Solver — Roots, Discriminant & Graph
Solve ax²+bx+c=0 with step-by-step working: real or complex roots, discriminant, vertex, axis of symmetry, and a plotted parabola. Free quadratic formula calculator.
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Scientific Notation & Significant Figures Calculator
Convert any number to scientific, E and engineering notation, count its significant figures, and round to a chosen number of sig figs — with a magnitude number line.
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Slope & Line Equation Calculator — Slope-Intercept, Point-Slope & Standard
Find the slope and equation of a line from two points: slope-intercept (y = mx + b), point-slope and standard forms, intercepts, midpoint, distance and angle, with a graph.
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Standard Deviation Calculator — Mean, Variance & Stats with Steps
Calculate mean, median, mode, range, population and sample standard deviation, variance, quartiles, IQR and outliers from a data set, with a histogram and ±σ bands.
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System of Equations Solver — 2×2 & 3×3 with Steps
Solve 2×2 and 3×3 linear systems with Cramer’s rule and the determinant. See the unique solution, or whether the system has no solution or infinitely many, with a graph.
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Triangle Solver — Law of Sines & Cosines (SSS, SAS, ASA, SSA)
Solve any triangle from three known sides or angles using the Law of Sines and Cosines. Get all six elements, area, perimeter, circumradius and inradius, with a scaled diagram.
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Z-Score & Normal Distribution Calculator — Probability & Percentile
Convert a raw score to a z-score and find left, right, between and two-tailed probabilities, or reverse-solve a value from a percentile, with a shaded normal curve.
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