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Math Calculators
Percentages, geometry, conversions, and homework helpers.
Math Calculators
Fraction Calculator
Add, subtract, multiply, divide, simplify, and convert fractions including mixed and big-number modes.
Percentage Calculator
Solve percentage equation, common phrase percent questions, percentage difference, and percentage change.
Random Number Generator
Generate random integers or decimals with range, count, precision, uniqueness, sorting, and animated reveal.
Percent Error Calculator
Calculate signed and absolute percent error from observed and true values with step-by-step formula breakdown.
Exponent Calculator
Solve for base, exponent, or result in b^x = y with optional e-base mode and step-by-step output.
Binary Calculator
Binary add/subtract/multiply/divide plus binary-decimal and decimal-binary conversions in one page.
Hex Calculator
Hex add/subtract/multiply/divide plus hex-decimal and decimal-hex conversions on one page.
Half-Life Calculator
Solve exponential decay for N, N₀, time, or half-life; convert between T₁/₂, τ, and λ.
Quadratic Formula Calculator
Solve ax^2 + bx + c = 0 with fraction support, discriminant analysis, and step-by-step roots.
Log Calculator
Evaluate y = log_b(x) with arbitrary base, domain validation, and verification line b^y = x.
Ratio Calculator
Solve A:B = C:D and scale ratios up or down while preserving proportional relationships.
Root Calculator
Square root, cube root, and nth root in one page with real-number domain checks.
Least Common Multiple Calculator
Find LCM and GCD from comma-separated integers with prime-factorization steps.
Greatest Common Factor Calculator
Find GCF from comma-separated integers with prime-factorization steps and companion LCM output.
Factor Calculator
Find factors, factor pairs, and prime factorization for an integer with a simple factor-tree style output.
Rounding Calculator
Round values by decimal place, whole-number place, or fraction step precision in one tool.
Matrix Calculator
Operate on two matrices with add, subtract, multiply, transpose, determinant, inverse, and power tools.
Scientific Notation Converter
Convert numbers between scientific, E-notation, engineering, and real form, then calculate with scientific notation inputs.
Big Number Calculator
Perform big integer arithmetic with add, subtract, multiply, divide, power, root, factorial, modulo, gcd, and lcm.
Standard Deviation Calculator
Calculate population or sample standard deviation, variance, confidence margins, and a frequency table from value lists.
Number Sequence Calculator
Compute arithmetic, geometric, and Fibonacci sequences. Find the nth term, sum of the first n terms, and list the series.
Sample Size Calculator
Find the sample size needed for a survey and compute the resulting margin of error with optional finite population correction.
Probability Calculator
Compute probabilities of two events, solve unknowns from any two inputs, evaluate repeated independent events, and find normal distribution probabilities.
Mean, Median, Mode, Range Calculator
Compute mean, median, mode, range, geometric mean, sum, count, minimum, maximum, and a column chart from a list of numbers.
Permutation and Combination Calculator
Compute nPr permutations and nCr combinations for n items taken r at a time with arbitrary-precision integers.
Z-score Calculator
Compute z-scores, convert between z-scores and probabilities, and find the probability between two z-scores.
Confidence Interval Calculator
Compute the confidence interval of a sample mean using the z-interval formula X̄ ± Z × (σ/√n).
Triangle Calculator
Solve any triangle from 3 inputs with at least one side. Returns sides, angles, area, heights, medians, inradius, circumradius, and a diagram.