Math & Numbers

Solve everyday arithmetic, ratios, fractions and number formats.

Algebra, Calculus & Functions

Quadratic Equation CalculatorSolve ax² + bx + c = 0 from three coefficients or from the whole equation, with exact and decimal answers.

Everyday Math

Percentage CalculatorWhat is X% of a number, what percent one value is of another, the whole behind a known percentage, the rise or fall between two figures, and sale prices after a discount — all on one page.

Linear Algebra & Optimization

Polynomial Root SolverFind every real and complex root of a polynomial from an expanded expression or coefficient list, with residuals and convergence checks.

Measurement Precision & Error

Significant Figures CalculatorCount the significant figures in any value, round to a chosen precision, or evaluate + − × ÷ expressions with the rounding rules shown step by step.

Numerical Analysis & ODEs

Fourier Series CalculatorEnter a periodic function or up to five pieces to calculate Fourier coefficients, inspect the partial sum, and compare the reconstruction.

Probability & Random Models

Z-Score & Standard Deviation CalculatorPaste a data set to get its mean, standard deviation and per-value z-scores, or solve z = (x − μ) / σ for one unknown with normal-curve probabilities.

Statistical Inference & Testing

Linear Regression CalculatorFit a least-squares line to paired data and read its slope, R², p-value, confidence intervals, residuals and predictions in one place.

Discrete Math & Number Theory

Boolean Algebra SimplifierReduce any Boolean expression to its minimal sum of products and product of sums, with every prime implicant and a row-by-row truth table check.

Fractions & Number Systems

Geometry & Ratios