Math Calculators
Quick, transparent math helpers for percentages, portions, and change over time.
Percentage Calculator
Free percentage calculator handles the three most common questions: what is X% of Y, X is what percent of Y, and percent increase or decrease between two numbers.
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Scientific Calculator
Full scientific calculator in your browser: trig functions, logs, powers, roots, factorials, memory, and DEG/RAD modes.
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Basic Calculator
Clean online basic calculator for quick arithmetic with a visible history tape.
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Fraction Calculator
Fraction arithmetic with automatic simplification and mixed-number output.
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Matrix Calculator
Compute determinants, inverses, transposes, products, and scalar multiples for square matrices up to 4×4.
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Big Number Calculator
Exact arithmetic on arbitrarily large integers: add, subtract, multiply, divide, remainder, power.
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Binary Calculator
Binary addition through bitwise AND/OR/XOR/shifts, with instant decimal/hex/octal conversions.
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Hex Calculator
Hexadecimal arithmetic and bit operations with live binary/octal/decimal conversions.
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Long Division Calculator
Division with every long-division step displayed, remainders, and optional decimal places.
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Triangle Calculator
Solve any triangle from three known parts: all sides, angles, area, perimeter, and heights.
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Volume Calculator
Volumes of nine solids with unit conversions to liters and cubic feet.
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Standard Deviation Calculator
Population and sample standard deviation, variance, mean, and SEM from any number list.
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Random Number Generator
Generate random integers in any range using crypto-grade randomness, with unique and sorted options.
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Number Sequence Calculator
Generate arithmetic and geometric sequences and Fibonacci numbers with nth term and partial sums.
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Percent Error Calculator
Experimental error as a percentage of the accepted true value.
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Exponent Calculator
Compute bⁿ including negative and fractional exponents instantly.
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Half-Life Calculator
Solve radioactive-style decay: initial amount, remaining amount, elapsed time, or half-life period.
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Quadratic Formula Calculator
Solve ax²+bx+c=0 with discriminant analysis: real, repeated, or complex conjugate roots.
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Slope Calculator
Slope between two points plus the y=mx+b line form and inclination angle.
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Log Calculator
Logarithm of any number to any base, including natural log and log10 presets.
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Area Calculator
Areas of seven plane figures with metric/imperial conversions.
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Sample Size Calculator
How many survey responses do you need? Compute n from confidence level, margin, and population.
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Probability Calculator
Single-event probability plus union, intersection, and complement rules for two events.
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Statistics Calculator
Complete descriptive statistics: quartiles, IQR, skewness hints, variance, SD, SEM.
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Mean, Median, Mode, Range Calculator
The four central-tendency basics from any list of numbers.
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Permutation and Combination Calculator
Permutations and combinations with and without repetition, exact BigInt results.
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Z-score Calculator
Convert raw scores to z-scores with percentile areas under the normal curve.
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Confidence Interval Calculator
Confidence intervals for means using z (known σ) or t (sample SD) critical values.
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Ratio Calculator
Simplify a:b or solve missing proportion term a:b = c:x.
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Distance Calculator
Euclidean distance between two points in 2D or 3D space.
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Circle Calculator
Enter any one circle property to derive radius, diameter, circumference, and area.
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Surface Area Calculator
Total surface area for sphere, cube, cylinder, cone, box, capsule, and pyramid.
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Pythagorean Theorem Calculator
Solve right-triangle hypotenuse or legs from any two sides, with right-angle verification.
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Right Triangle Calculator
Solve every side and acute angle of a right triangle from two known values.
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Root Calculator
nth roots including negative odd-index real roots.
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LCM Calculator
Least common multiple across multiple integers via GCD folding.
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Greatest Common Factor Calculator
Largest integer dividing every number in your list, via Euclid's algorithm.
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Factor Calculator
Every positive divisor of an integer, sorted, with count and primality check.
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Rounding Calculator
Round to any place value or significant-figure count, with floor/ceiling modes.
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Scientific Notation Calculator
Convert decimals to a×10ᵇ notation and back, with operation support.
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Prime Factorization Calculator
Break any integer into its prime factors with exponent notation.
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Common Factor Calculator
List all factors shared by two integers, greatest first.
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Average Calculator
Instant arithmetic mean of any list, with count and sum context.
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P-value Calculator
Convert test statistics to p-values: normal z, Student t, chi-square, and F distributions with tail choice.
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About these calculators
Everyday math should not require a spreadsheet. These calculators handle the computations people actually need — tips, discounts, grades, price comparisons — and show the underlying formula so the answer is never a black box.
Type your numbers and watch results appear instantly. All calculations run locally in your browser.