Free online math calculators

Unit converters, equation solvers, statistics tools, matrix operations, and general math utilities.

This hub holds sixteen calculators that each finish one arithmetic job rather than pretending to be a scientific calculator. The Unit Converter covers twelve measurement families — length, weight, temperature, volume, area, speed, time, data, pressure, energy, force and frequency — and its length table runs from micrometres to light years without switching pages. The Statistics Calculator takes a pasted column or a comma-separated list and returns mean, median, mode, population and sample variance, standard deviation, quartiles, the interquartile range, percentiles, skewness and kurtosis, plus geometric and harmonic means, and it marks values that fall outside the 1.5 x IQR fences as outliers and outside 3 x IQR as extreme. The Matrix Calculator multiplies, transposes, ranks and inverts, expands determinants by cofactors with the intermediate lines written out, and returns eigenvalues for 2x2 and 3x3 inputs. The Number Base Converter moves a value between base 2, 8, 10, 16, 32 and 64, accepts 0b, 0o and 0x prefixes, and prints both the positional expansion on the way into decimal and the repeated-division remainders on the way back out. The Function Plotter reads expressions with a tokenizer and recursive-descent parser written for this page instead of JavaScript eval, so an expression like 2sin(x)+x^2 is graphed as data and never executed as code; the graph pans, zooms and exports to PNG. Money and body arithmetic sit in the same list: the Loan Calculator builds a month-by-month amortisation schedule and shows how much term an extra monthly payment removes, Compound Interest models regular contributions at a compounding frequency you pick and can discount the result by an inflation rate, the Tip Calculator splits a bill across any number of people with an optional round-up, and the BMI Calculator switches between metric and imperial and reports how far you are from a target band in the unit you chose. Number to Words spells figures out in English, Spanish, French and German and has currency modes for USD, EUR and GBP plus an ordinal and a check-writing mode. Roman Numerals converts in both directions. The IP Subnet Calculator returns network address, broadcast, wildcard mask, usable host range, CIDR notation and address class for an IPv4 block. Two of the sixteen work on measurements of a person rather than a number: the Macro Calculator derives basal metabolic rate with the Mifflin-St Jeor equation, multiplies it by an activity factor between 1.2 and 1.9 to reach total daily energy expenditure, and splits the result into carbohydrate, protein and fat grams on a balanced, low-carb, high-protein, keto or custom ratio; the Body Fat Calculator offers the US Navy circumference method, a BMI-derived estimate and a three-site skinfold calculation, using chest, abdomen and thigh for men and triceps, suprailiac and thigh for women. All sixteen compute in JavaScript inside the open tab, so no figure you enter is sent anywhere.

16 tools · always free · no account needed