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Math & Science tools

18 free tools, all running right in your browser.

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ArithmeticFractions, ratios, rounding, scientific notation and GCF/LCM.5 tools →AlgebraQuadratic equations and systems of equations.2 tools →Statistics & ProbabilityMean, median, standard deviation, odds, z-scores and combinations.4 tools →GeometryArea and volume of shapes, triangles and Pythagoras.3 tools →ScienceOhm's law, density, molar mass and half-life.4 tools →

➗ Arithmetic

Fraction Calculator

Add, subtract, multiply and divide fractions.

Ratio Calculator

Simplify and scale ratios.

Rounding Calculator

Decimal places, significant figures, nearest.

Scientific Notation Converter

Decimal ↔ scientific and engineering notation.

GCF & LCM Calculator

Greatest common factor and least common multiple.

🧩 Algebra

Quadratic Equation Solver

Solve ax² + bx + c = 0.

System of Equations Solver (2×2)

Solve two equations with x and y.

📊 Statistics & Probability

Statistics Calculator

Mean, median, mode and standard deviation.

Probability Calculator

Chance of at least once, every time or exactly X.

Z-Score & Percentile Calculator

How unusual is a value?

Permutation & Combination Calculator

nPr and nCr.

📐 Geometry

Area & Volume Calculator

Rectangles, circles, cylinders, spheres and more.

Triangle Calculator

Angles and area from three sides.

Pythagorean Theorem Calculator

Find the missing side of a right triangle.

🔬 Science

Ohm's Law Calculator

Voltage, current, resistance and power.

Density Calculator

Density, mass or volume.

Molar Mass Calculator

Molar mass from a chemical formula.

Half-Life Calculator

Radioactive decay and drug half-life.