数学ツール

代数・微積分・統計・数値。

Free mathematical calculators for students, teachers, and professionals. Solve equations and polynomials, compute derivatives and integrals, work with matrices and vectors, and analyze data with statistics, regression, and probability tools. Number theory utilities cover primes, factorization, GCD, and LCM. Every tool runs instantly in your browser with step-by-step work and no signup.

Popular 数学ツール

Equation SolverSolve linear and quadratic equations step by step. Enter expressions like 2x + 3 = 7 or x^2 - 5x + 6 = 0.
Statistics CalculatorCompute mean, median, mode, standard deviation, variance, quartiles, range, and more from any dataset with step-by-step formulas.
Sample Size CalculatorCalculate sample size for surveys, mean estimates, A/B tests, and two-group comparisons. Set confidence level, power, margin of error, and effect size. Step-by-step formulas. Free, browser-based.

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Measurement Uncertainty Calculator

Combine and propagate measurement uncertainty with root-sum-of-squares (RSS). Add, subtract, multiply, or divide values with ± uncertainties, convert percent uncertainty, and compute expanded uncertainty U = k·u. Free, instant, browser-based.

Used 3 timesUpdated 18 minutes ago

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Error Percentage Calculator

Calculate percent error, absolute error, relative error, and percent difference between measured and accepted values. Step-by-step formulas for physics and chemistry lab reports. Free, instant, browser-based.

Used 3 timesUpdated 17 minutes ago

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Matrix Calculator

Add, subtract, multiply, transpose, invert, and find determinants of matrices up to 6×6.

Used 2 timesUpdated 20 minutes ago

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Scientific Notation Converter

Convert numbers to and from scientific notation, e-notation, and engineering notation. Enter decimals (299792458), e-notation (1.23e-5), or 1.23 × 10^5 format. Get normalized scientific, Unicode superscript, engineering (×10³), and decimal forms. Adjustable significant figures. Free, browser-based.

Used 2 timesUpdated 23 minutes ago

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Vector Calculator

Compute 2D and 3D vector operations — add, subtract, dot product, cross product, magnitude, unit vector, angle, and projection — with steps.

Used 1 timesUpdated 17 minutes ago

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Prime Number Generator

Generate prime numbers in a range or list the first N primes using the Sieve of Eratosthenes with copy-ready output.

Used 1 timesUpdated 19 minutes ago

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LCM Calculator

Find the least common multiple (LCM) and GCD of two or more positive integers with prime-factor and step-by-step GCD methods.

Used 1 timesUpdated 8 minutes ago

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GCD Calculator

Find the greatest common divisor (GCD) and LCM of two or more positive integers with Euclidean algorithm steps and prime-factor method.

Used 1 timesUpdated 23 minutes ago

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Probability Calculator

Calculate basic, complement, union, intersection, conditional, and binomial probabilities with formulas and step-by-step work.

Used 1 timesUpdated 20 minutes ago

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Combinations Calculator

Calculate combinations nCr and permutations nPr with factorial formulas, step-by-step work, and support for large results.

Used 1 timesUpdated 28 minutes ago

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Standard Deviation Calculator

Calculate sample and population standard deviation and variance from any data set with squared-deviation steps.

Used 1 timesUpdated 31 minutes ago

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Data Plotter

Plot data as line, scatter, or bar charts from x,y pairs or separate columns. Enter lab results, calibration curves, or trial data — get an instant SVG chart with axis labels. Free, browser-based.

Used 1 timesUpdated 16 minutes ago

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