Numbers & Math

Calculate age in seconds, minutes, hours, days and years.

Calculate proportional width or height from any aspect ratio.

Calculate AND, OR, XOR, NOT and shifts with binary and hexadecimal output.

Calculate final balance, interest earned and contributions over time.

Generate Fibonacci numbers with index and comma-separated output.

Greatest common divisor and least common multiple of any list of integers.

Compute monthly payments, total interest and amortisation for a loan.

Evaluate mathematical expressions with functions and constants.

Add, subtract and multiply 2x2 matrices, plus determinant values.

Convert between binary, octal, decimal and hexadecimal.

Five percentage modes: of, is what %, % change, increase, decrease.

Check primality, factorize and list primes up to N.

Convert CSS px, rem and em values with configurable base font size.

Solve ax² + bx + c = 0 with real or complex roots.

Generate cryptographically-random integers in a range.

Convert between Roman numerals and Arabic numbers.

Estimate take-home pay after tax, social contributions and deductions.

Convert decimal numbers to and from scientific notation.

Mean, median, mode, standard deviation and more for any list of numbers.

Calculate the tip and split a bill between any number of people.

Convert between length, mass, volume, area, speed, time and temperature.

Add or remove VAT and see net, tax and gross amounts.