Math Tools
Math Calculators
Free, precise math tools for everyday calculations — no account needed.
- Percentage Calculator% of a number, % change, and reverse percentage in one tool.
- Percent Error CalculatorPercent error, relative error, absolute error, accuracy, and full experimental analysis with step-by-step solutions.
- Percent Off CalculatorStacked coupons, cashback, tax, shipping, and the true final checkout total.
- Sale Price & Discount CalculatorSale price, savings, and discount percentage instantly.
- Marks Percentage CalculatorExam percentage, grade, and pass/fail from marks obtained.
- GPA CalculatorSemester, weighted, and cumulative GPA on multiple grading scales.
- Scientific CalculatorTrig, log, exponents, roots, factorial, and memory functions.
- Unit ConverterAll-in-one converter for 40+ measurement categories — length, weight, temperature, currency, crypto, and more.
- GDP CalculatorCalculate GDP via expenditure or income approach with charts.
- Horsepower CalculatorCompute horsepower from torque, force, watts, or drag-strip data.
- Molecular Weight CalculatorCalculate molecular weight from any chemical formula instantly.
- Dilution CalculatorSolve C₁V₁=C₂V₂, plan serial dilutions, find dilution ratios, and convert concentration units.
- Binary CalculatorAdd, subtract, multiply, and divide binary numbers with bit-level analysis.
- Slope CalculatorSlope, angle, line equation, midpoint, and intercepts across five coordinate-geometry modes.
- Probability CalculatorEvent probability, unions, intersections, normal distribution, and confidence intervals.
- Mean Median Mode Range CalculatorMean, median, mode, range, quartiles, variance, standard deviation, and outliers with charts.
- Z-Score CalculatorZ-score, percentile rank, tail probabilities, and Z ↔ probability conversion with bell curves.
- Sample Size CalculatorSample size, margin of error, confidence interval, and finite population correction.
- P-Value CalculatorZ ↔ p-value conversion, significance, critical values, normal distribution, and hypothesis testing toolkit.
- Standard Deviation CalculatorPopulation and sample σ, variance, SEM, confidence intervals, histograms, and outlier detection.
- Statistics CalculatorFull descriptive statistics — mean, SD, quartiles, IQR, skewness, kurtosis, and Z-score probabilities.
- Ratio CalculatorSolve A:B = C:D proportions, simplify ratios, and convert ratios ↔ percentages with charts.
- Circle CalculatorRadius, diameter, circumference, area, arc length, sector, chord, and annulus — five tools.
- Pythagorean Theorem CalculatorRight triangles, 2D/3D distance, and 45-45-90 / 30-60-90 special triangles across five tools.
- Triangle CalculatorSolve any triangle (SSS, SAS, ASA, AAS, SSA) for sides, angles, area, and centres.
- Root CalculatorSquare root, cube root, and any nth root with radical simplification and graphs.
- Racine Carrée CalculatorSquare roots, radical simplification, and a perfect-square checker with step-by-step working.
- Common Factor CalculatorGCF, HCF, GCD, and every common factor with prime factorisations and factor trees.
- Rounding CalculatorRound to decimal places, whole numbers, or custom precision with seven rounding methods.
- Scientific Notation CalculatorConvert between scientific, engineering, and E-notation with full arithmetic and log support.
- Prime Factorization CalculatorDecompose any integer into prime factors with exponent form, factor tree, and divisor sums.
- LCM CalculatorLeast Common Multiple of any list of integers with prime-factor and ladder methods.
- Matrix CalculatorAdd, subtract, multiply, invert, decompose (LU/QR/Cholesky), and solve Ax = b with eigenvalues and rank.
- GCD CalculatorGreatest Common Divisor (HCF/GCF) via Euclidean algorithm, prime factorisation, or ladder.
- Long Division CalculatorLong division with paper-style working, quotient, remainder, decimals, fractions, and modulo.
- Basic CalculatorFour-function arithmetic with percent, √, x², memory, history, and full keyboard support.
- Average CalculatorMean, median, mode, range, SD, variance, geometric/harmonic mean, and quartiles with charts.
- Fraction CalculatorAdd, subtract, multiply, divide, simplify, and convert fractions — mixed numbers and decimals.
- Number Sequence CalculatorArithmetic, geometric, Fibonacci, and custom sequences with n-th term, partial sums, and charts.
- Exponent CalculatorSolve y = bˣ for any unknown with expanded multiplication and a powers-of-2/3/10 reference.
- Hex CalculatorHex arithmetic plus hex ↔ decimal ↔ binary ↔ octal conversion with A–F digit reference.
- Log CalculatorSolve log_b(x) = y for any unknown with change-of-base derivation, plot, and log ⇄ exp panel.
- Permutation and Combination CalculatorExact nPr and nCr with factorial breakdown, the nPr = nCr · r! bridge, and worked examples.
- Confidence Interval CalculatorConfidence interval, margin of error, standard error, and critical Z with error-bar charts.
- Distance CalculatorSix-in-one suite: 2D/3D coordinate, Haversine lat/lon, map route, n-dimensional vector, and geometry.
- Area CalculatorFourteen-shape suite — triangle, circle, ellipse, polygon, land area, and coordinate vertices.
- Surface Area CalculatorTen 3D-solid suite — sphere, cone, cube, cylinder, capsule, frustum, ellipsoid, and pyramid.