Converters
Units, bases, and format conversions.
Converters turn one unit or format into another in a single step: length, weight and temperature units, number bases like binary, decimal and hexadecimal, or data formats you paste in and get back transformed. They are built for students and engineers converting measurements, developers switching between number bases, and anyone who just needs a quick, reliable answer without doing the math by hand. Reversible pairs are handled as one strong two-way tool — type in either side and the other updates instantly — so you never have to hunt for the 'reverse' version. Everything runs in your browser with no uploads and no sign-up. Free, instant, and built to give you a copy-ready result in seconds.
7 tools
All tools → Area Converter Type an area into any unit and instantly read it in every other unit at once — metric, imperial, acres, hectares, and East Asian property units (mu, tsubo, ping) on one live page. Celsius To Fahrenheit Type a temperature in either box and instantly read it in both Celsius and Fahrenheit — with a ready-made everyday reference table so you don't even have to type for common temperatures. Cm to Inches Converter Type a centimeter or inch value and instantly see the exact conversion in the other unit, both directions, no clicks or sign-up. Kg to Lbs Type a kilogram or pound value and instantly see the exact conversion both ways, with a ready-made reference table. Km to Miles Converter Type a distance in kilometers or miles and instantly read it in the other unit, both directions, on one page. Number Base Converter Type a number in any base (binary, octal, decimal, hex, or any base 2-36) and instantly see it in every other base, all on one screen. Roman Numeral Converter Convert any number to Roman numerals and back instantly, both directions, including years and dates, right in your browser.