數學工具

Free times tables trainer — pick a multiplication table from 2 to 12, practice random prompts, and track your mastery percentage.

Compute natural log (ln), common log (log₁₀), binary log (log₂), custom-base logarithms, and antilogs with change-of-base steps and verification.

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.

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

Fit a linear regression line to (x, y) data — slope, intercept, equation, correlation r, R², and predictions with step-by-step work.

Find the mean, median, and mode of any data set with frequency tables, sorted data, and step-by-step work.

Calculate permutations nPr and factorials n! for ordered arrangements with formulas and step-by-step work.

Add, subtract, multiply, and divide complex numbers, find conjugate, modulus, argument, polar form, and integer powers with steps.

Evaluate limits numerically with one- and two-sided approaches. Supports finite points and ±∞.

Compute symbolic derivatives of functions with step-by-step rules. Supports polynomials, trig, ln, exp, and more.

Graph mathematical functions y = f(x) instantly. Enter expressions like sin(x), x^2, exp(x), or multiple functions — get an SVG plot with axes, grid, and auto-scaling. Free, browser-based.

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