Percentage Calculator
Work out a percentage of a number, a change or a difference.
Math and Statistics tools
Sort out a calculation with the working shown. Percentages, fractions and ratios, plus averages and spread for a set of numbers. Each calculator states the formula or method it uses, so you can check the result rather than trusting a black box.
40 tools in this part of the catalogue.
Featured Math and Statistics tools
Arithmetic21 tools
Percentage Calculator
Work out a percentage of a number, a change or a difference.
Fraction Calculator
Add, subtract, multiply, divide or simplify exact fractions.
Ratio and Proportion Calculator
Simplify a ratio, or solve one missing value in a proportion.
GCD and LCM Calculator
Find the greatest common divisor and least common multiple.
Scientific Calculator
Work out brackets, powers, roots, trigonometry and logs.
Prime Factorization Calculator
Find exact prime factors of a bounded whole number.
Permutations and Combinations Calculator
Count arrangements and selections without rounding.
Set Calculator
Compare text sets with an explicit case policy.
Rounding and Significant Figures Calculator
Round decimals or significant figures with a chosen rule.
Arithmetic and Geometric Sequence Calculator
Find sequence terms and sums from entered values.
Linear Interpolation Calculator
Interpolate between numeric points with a stated linear rule.
Coordinate Geometry Calculator
Find distance, midpoint, slope and a line through two points.
Modular Arithmetic Calculator
Calculate exact remainders, modular powers and inverses.
Ohm’s Law Calculator
Solve a resistive DC circuit from two known values.
Resistor Color Code Calculator
Read resistor bands or encode a representable value.
Complex Number Calculator
Calculate complex arithmetic and polar form.
Matrix Calculator
Work with small matrices and inspect singular cases.
Vector Calculator
Compare vectors and calculate dot, cross and projection.
Solid Geometry Calculator
Calculate volume and total area of six solids.
Linear Equation System Solver
Solve Ax=b and inspect rank and residuals.
Polynomial Root Finder
Find approximate real polynomial roots.
Statistics13 tools
Descriptive Statistics Calculator
Summarize a list of numbers with mean, median and range.
Standard Deviation Calculator
Calculate population or sample variance and standard deviation.
Weighted Average Calculator
Average value and weight pairs and show each row's share of the total.
Percentile and Quartile Calculator
Compare method-specific percentiles and quartiles.
Moving Average Calculator
Calculate SMA or EMA with a stated window and seed.
Outlier Detector
Flag possible outliers and export all observations.
Conditional Probability Calculator
Calculate conditional probability or a Bayes update.
Effect Size Calculator
Calculate standardized differences or squared r.
Correlation and Regression Calculator
Fit a line and review paired-data residuals.
Probability Distribution Explorer
Inspect three probability distributions.
Confidence Interval Calculator
Calculate mean and proportion intervals.
Sample Size Calculator
Estimate a sample count for precision.
Statistical Hypothesis Test Calculator
Inspect supported statistical test results.
Education6 tools
GPA Calculator
Calculate a course-credit GPA on a US 4.0 scale.
Quadratic Equation Solver
Solve a quadratic equation and read the roots and steps.
Shape Area Calculator
Solve triangles, sectors and polygons, with area and perimeter.
Derivative Calculator
Differentiate a supported real expression.
Integral Calculator
Integrate polynomials or finite expressions.
Function Graph Plotter
Plot 501 real expression samples.