# Math — YouCalc

> Percentages, ratios, fractions, and quick algebra.

## All Math calculators

- [Exponential Growth & Decay Calculator](https://youcalc.com/en/math/exponential-growth-decay/): 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.
- [Fraction Calculator](https://youcalc.com/en/math/fraction-operations/): 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.
- [Matrix Calculator](https://youcalc.com/en/math/matrix-operations/): 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.
- [Percentage Calculator](https://youcalc.com/en/math/percentage/): 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.
- [Permutations & Combinations Calculator](https://youcalc.com/en/math/permutations-combinations/): Compute permutations (nPr) and combinations (nCr), plus the with-repetition variants, with factorial expansions and a Pascal’s-triangle view. Free nPr/nCr calculator.
- [Prime Factorization Calculator](https://youcalc.com/en/math/prime-factorization/): 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).
- [Quadratic Equation Solver](https://youcalc.com/en/math/quadratic-equation/): 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.
- [Scientific Notation & Significant Figures Calculator](https://youcalc.com/en/math/scientific-notation/): 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.
- [Slope & Line Equation Calculator](https://youcalc.com/en/math/slope-line-equation/): 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.
- [Standard Deviation Calculator](https://youcalc.com/en/math/statistics-standard-deviation/): 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.
- [System of Equations Solver](https://youcalc.com/en/math/system-of-equations/): 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.
- [Triangle Solver](https://youcalc.com/en/math/triangle-solver/): 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.
- [Z-Score & Normal Distribution Calculator](https://youcalc.com/en/math/z-score-normal-distribution/): 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.

## Optional

- [YouCalc](https://youcalc.com/en/)
- [XML sitemap](https://youcalc.com/sitemap.xml)