Math & statistics calculators
Algebra, geometry, statistics, fractions and number tools.
- Absolute Difference CalculatorAbsolute difference |a − b| between two numbers.
- Absolute Value CalculatorAbsolute value |x| of a number.
- Arc Length CalculatorCalculate the arc length, sector area and chord length of a circle from its radius and the central angle in degrees or radians.
- Average CalculatorAverage (mean) of numbers.
- Basic CalculatorAdd, subtract, multiply, divide.
- Binary CalculatorBinary to decimal and operations.
- Binomial Probability CalculatorFind the probability of exactly, at most or at least k successes in n trials with success probability p, plus the mean and standard deviation.
- Circle CalculatorCircle area, circumference, radius.
- Coefficient of Variation CalculatorCalculate the coefficient of variation (relative standard deviation) of a data set, to compare how spread out data sets with different averages are.
- Confidence Interval CalculatorCI for mean (normal).
- Correlation Coefficient CalculatorCalculate the Pearson correlation coefficient (r) and r² between two sets of numbers, and how strong the relationship is.
- Decimal to Fraction CalculatorConvert a decimal to a fraction in lowest terms and as a mixed number, like 0.75 = 3/4 or 2.375 = 2 3/8.
- Distance CalculatorDistance between two points.
- Exponent CalculatorPower and exponent.
- Factor CalculatorFactors of a number.
- Factorial Calculator (n!)Factorial of a non-negative integer.
- Fibonacci Numbers CalculatorFirst N numbers in the Fibonacci sequence.
- Fraction & Percentage CalculatorConvert and calculate fractions and percentages.
- Geometry CalculatorArea, volume, perimeter of common shapes.
- Golden Ratio CalculatorSplit a length by the golden ratio (φ ≈ 1.618), or find the matching longer or shorter side, for design, layout and photography.
- GPA CalculatorGrade point average from letter grades.
- Grade CalculatorGrade from points or weighted categories.
- Greatest Common Factor CalculatorGCF of two or more numbers.
- Hex CalculatorHexadecimal to decimal and operations.
- Least Common Multiple CalculatorLCM of two or more numbers.
- Linear Regression CalculatorFit a least-squares line of best fit (y = mx + b) to paired data and get the slope, intercept, r² and a prediction for any x.
- Log CalculatorLogarithm (log10, ln).
- Long Division CalculatorLong division with steps.
- Matrix CalculatorMatrix add, multiply, determinant.
- Mean, Median, Mode, Range CalculatorDescriptive statistics.
- Midpoint CalculatorFind the midpoint between two points on a graph, plus the distance between them and the slope of the line joining them.
- Modulo CalculatorRemainder (a mod b) and quotient.
- Number Base ConverterConvert whole numbers between any bases from 2 to 36: binary, octal, decimal, hexadecimal and more, including very large numbers.
- Number Sequence CalculatorNext number in sequence (arithmetic/geometric).
- Odds CalculatorOdds for/against and probability from wins and losses.
- P-value CalculatorP-value from z-score (one-tailed).
- Pascal's Triangle GeneratorFirst N rows of Pascal's triangle.
- Percent Change CalculatorPercent change from old value to new value.
- Percent Error CalculatorPercent error between actual and expected.
- Percentage Difference CalculatorSymmetric percentage difference between two values.
- Percentile CalculatorFind the value at any percentile of a data set, and the percentile rank of a particular value.
- Permutation and Combination CalculatornPr and nCr.
- Polar to Cartesian ConverterConvert between polar coordinates (r, θ) and Cartesian coordinates (x, y), with the angle in degrees or radians.
- Prime Factorization CalculatorPrime factors of a number.
- Prime Number CalculatorList first N primes or check if a number is prime.
- Probability CalculatorBasic probability (single event).
- Proportion CalculatorSolve a proportion a/b = c/x for the missing value, the cross-multiplication used for recipes, maps, scale drawings and unit prices.
- Pythagorean Theorem CalculatorRight triangle side from a²+b²=c².
- Quadratic Equation SolverSolve ax² + bx + c = 0.
- Quartile and IQR CalculatorFind the quartiles, interquartile range (IQR) and five-number summary of a data set, plus the fences for spotting outliers.
- Random Number GeneratorRandom integer in a range.
- Ratio CalculatorRatio simplify and compare.
- Right Triangle CalculatorRight triangle sides and angles.
- Root CalculatorSquare root, nth root.
- Rounding CalculatorRound to decimal place or significant figures.
- Sample Size CalculatorSample size for margin of error.
- Scientific CalculatorSin, cos, tan, log, power, sqrt.
- Scientific Notation CalculatorConvert to/from scientific notation.
- Significant Figures CalculatorCount the significant figures in a number and round it to any number of significant figures, with the result in scientific notation too.
- Slope CalculatorSlope from two points or equation.
- Standard Error CalculatorCalculate the standard error of the mean from a list of numbers, with the sample standard deviation and an approximate 95% confidence interval.
- Statistics CalculatorMean, median, mode, standard deviation.
- Surface Area CalculatorSurface area of 3D shapes.
- System of Equations SolverSolve two linear equations in two unknowns (x and y) and see whether the system has one solution, none or infinitely many.
- Triangle CalculatorTriangle sides, angles, area.
- Unit Rate CalculatorRate per one unit (e.g. price per item).
- Volume CalculatorVolume of a box, cube, cylinder, cone, sphere, hemisphere or pyramid, converted to cubic feet, cubic meters, liters and US gallons.
- Vote Percentage CalculatorVote share as a percentage of total votes.
- Weighted Average CalculatorCalculate a weighted average (weighted mean) from values and their weights, for grades, prices, portfolios or survey scores.
- Z-score CalculatorZ-score from mean and SD.
These calculators cover everyday math, geometry, statistics, and academic helpers. Solve equations, convert fractions and percentages, compute GPA, or get descriptive statistics from a set of numbers. Useful for homework, quick reference, or double-checking by hand.
Who they're for: Students, teachers, and anyone who needs a fast answer to a math or stats problem. Tools are straightforward: enter your numbers and get the result, often with the formula or method noted so you can learn or verify.
Common use cases: Solving quadratic equations, converting fractions to decimals or percentages, computing mean/median/mode and standard deviation, finding area or volume of shapes, and calculating GPA from letter grades. For high-stakes or graded work, confirm with your instructor or syllabus.