Math
Percentages, statistics and equations. These tools are free, need no account, and come with simple step-by-step instructions.
- Percentage CalculatorX% of Y, X is what % of Y, and percent increase or decrease.
- Average CalculatorMean, median, mode, range, sum and count of a list of numbers.
- Standard Deviation CalculatorSample and population standard deviation and variance.
- Fraction CalculatorAdd, subtract, multiply and divide fractions, simplified.
- Ratio CalculatorSolve A : B = C : ? and simplify ratios.
- GCF & LCM CalculatorGreatest common factor and least common multiple of a list.
- Prime Number CheckerIs it prime? Plus prime factorization and the next prime.
- Quadratic Equation SolverSolve ax² + bx + c = 0, including complex roots.
- Random Number GeneratorRandom numbers in any range, with or without repeats.
- Scientific CalculatorCalculate expressions with powers, roots, logarithms and trigonometry.
- GPA & Weighted Grade CalculatorCalculate a credit-weighted average using your school’s numeric grade scale.
- Factorial CalculatorCalculate n! for whole numbers from 0 to 170.
- Permutation & Combination CalculatorCount ordered arrangements or unordered selections.
- Scientific Notation ConverterExpress a finite number as a coefficient times a power of ten.
- Significant Figures CalculatorRound a number to a chosen number of significant digits.
- Rounding CalculatorRound, floor or ceil to a decimal place.
- Logarithm CalculatorFind log base b of a positive number.
- Nth Root CalculatorFind real integer roots, including odd roots of negatives.
- Modulo CalculatorFind a non-negative remainder for integer division.
- Triangle CalculatorArea, perimeter and angles from three sides.
- Circle CalculatorArea, circumference and diameter from a radius.
- Rectangle CalculatorFind rectangle area, perimeter and diagonal.
- Trapezoid Area CalculatorFind area from parallel bases and perpendicular height.
- Cylinder Volume & Surface AreaVolume and closed surface area of a right circular cylinder.
- Cone CalculatorVolume and total surface area of a right circular cone.
- Sphere CalculatorFind sphere volume and surface area.
- Distance & Midpoint CalculatorDistance and midpoint between two Cartesian points.
- Slope & Line Equation CalculatorFind slope and intercept from two points.
- Two Linear Equations SolverSolve ax + by = e and cx + dy = f.
- Arithmetic Sequence CalculatorFind the nth term and sum of a constant-difference sequence.
- Geometric Sequence CalculatorFind the nth term and finite geometric sum.
- Z-Score CalculatorStandardize a value using mean and standard deviation.
- Mean Confidence Interval CalculatorNormal-approximation interval for a sample mean.
- Survey Sample Size CalculatorEstimate sample size for a population proportion.
- Independent Events ProbabilityCalculate both, either or neither of two independent events.
- 2×2 Matrix CalculatorDeterminant, transpose and inverse of a 2×2 matrix.
- Scientific Notation ConverterConvert standard numbers into scientific and engineering notation.
- Percentage Increase / Decrease CalculatorCalculate the percentage change between initial and final values.
- Percentage Difference CalculatorCalculate relative percentage difference between two independent numbers.
- Fraction to Decimal & Percentage ConverterConvert proper, improper, and mixed fractions to decimal values.
- Decimal to Fraction SimplifierConvert any decimal into a simplified irreducible fraction.
- Pythagorean Theorem CalculatorSolve for side a, side b, or hypotenuse c of a right triangle.
- Cylinder Volume & Surface Area CalculatorCompute volume, surface area and base area of a cylinder.
- Sphere Volume & Surface Area CalculatorCalculate volume, surface area and diameter of a 3D sphere.
- Cube Volume & Surface Area CalculatorCalculate volume, surface area, and diagonals of a cube.
- Matrix Determinant (2x2 and 3x3) CalculatorCompute determinant of 2x2 and 3x3 square matrices.
- GCD & LCM Dual Number CalculatorCalculate Greatest Common Divisor and Least Common Multiple.
- Relative Risk & Odds Ratio CalculatorCalculate epidemiological Relative Risk, Odds Ratio, and Risk Reduction.
- Compound Annual Growth Rate & Future ValueCalculate compound growth with compounding frequency intervals.
- Quadratic Function Vertex & Parabola SolverFind vertex, axis of symmetry, and discriminant of a quadratic parabola.
- Half-Life Decay & Remaining Quantity CalculatorCalculate exponential radioactive decay and chemical half-life curves.