Math Tools — Free Online Utilities

Calculate your exact age in years, months, days, hours, and minutes.

Calculate the exact age difference between two people

Calculate your Body Mass Index in metric or imperial units — instant result, no signup.

Calculate compound interest growth with monthly contributions — see your investment grow over time with a chart.

Calculate the difference between two dates or add/subtract days, weeks, months, and years from any date.

Solve linear, quadratic, cubic, and simultaneous equations with step-by-step working.

Visualize the Fibonacci sequence, animated golden spiral, and ratio convergence toward φ.

Add, subtract, multiply, and divide fractions with step-by-step working and visual fraction bars.

Plot mathematical functions interactively on a canvas with a safe recursive descent parser. Supports multiple functions, zoom/pan, intercepts, and local extrema.

Calculate great-circle distance between two locations using the Haversine formula.

Calculate the monthly payment, total interest, and total paid on a loan, with a month-by-month amortization schedule.

Perform matrix operations — add, subtract, multiply, transpose, determinant, and inverse — with step-by-step working.

Format any number as locale separators, scientific notation, engineering notation, words, abbreviations, Roman numerals, and more — all at once.

Generate classic number sequences, identify an unknown sequence, or define a custom one.

Convert numbers to ordinal form, ordinal words, and Roman numerals.

Check how strong your password is — entropy score, crack time estimate, and actionable improvement tips.

Compute percentages, increases, decreases, tips, and percentage-of-total — six modes.

Factorize numbers up to 10¹⁵ with SVG factor trees

Check if any number up to 10¹² is prime, see its factorization, and explore related prime facts.

Full scientific calculator with trig, logarithms, powers, and history — runs entirely in your browser.

Convert numbers between standard, scientific, engineering, and E-notation with significant-figure rounding.

Convert speed between m/s, km/h, mph, knots, ft/s, Mach, and more.

Solve for speed, distance, or time given the other two values with automatic unit conversion.

Calculate mean, median, mode, standard deviation, variance, and more from any dataset.

Convert temperatures between Celsius, Fahrenheit, Kelvin, Rankine, and Réaumur instantly.

Calculate tip amount and split the bill between any number of people — with custom tip percentage.

Convert weight and mass between all common units instantly