Converters
Convert between units, formats, and data types instantly — everything runs locally.
Number Base Converter
Convert numbers between binary, octal, decimal, hexadecimal or any base from 2 to 36 — even very large ones. Free, in your browser.
ConvertersRoman Numeral Converter
Convert numbers to Roman numerals and back (1–3999) — instantly, in your browser, with malformed-numeral validation.
ConvertersUnit Converter
Convert length, mass, temperature, data, speed, area, volume, pressure, energy, power, force, frequency and angle units — metric and imperial, in your browser.
ConvertersNumber to Words Converter
Convert any number into spelled-out words in English or Korean, from zero to the billions and beyond — runs 100% in your browser with no upload.
ConvertersTime Zone Converter
Convert a date and time from one time zone to another with the live UTC offset — runs 100% in your browser with no upload.
ConvertersCooking Measurement Converter
Convert recipe amounts between US and metric cups, tablespoons, teaspoons, millilitres and fluid ounces instantly — runs 100% in your browser with no upload.
ConvertersFuel Economy Converter
Convert fuel economy between US MPG, UK MPG, km/L and L/100km instantly — runs 100% in your browser with no upload.