Converters
Convert between units of length, weight, volume, area, speed and temperature, compare times across the world, find a meeting time that suits every time zone, translate and play Morse code, spell out numbers in words, translate Roman numerals or switch between binary, octal, decimal and hexadecimal. Fast, accurate and free.
7 free tools. Tap any card to open it. No sign-up needed.
Unit ConverterConvert length, weight, temperature, volume, speed and area in one place.Time Zone ConverterConvert a time between zones and see it in cities around the world.Number to Words ConverterSpell out any number in English words, including cheque-style amounts.Roman Numeral ConverterConvert between numbers and Roman numerals in either direction.Binary, Hex & Decimal ConverterConvert numbers between binary, octal, decimal and hexadecimal in one step.Time Zone Meeting Planner NewFind a meeting time that works for everyone, wherever they are.Morse Code Translator NewTranslate to and from Morse code, then hear it or see it flash.
Which converter should I use?
- Measurements: the unit converter handles length, weight, volume, area, speed and temperature using exact factors.
- Number systems: the binary, hex and decimal converter switches between bases instantly. See how to convert binary to decimal.
- Writing amounts: the number to words converter spells numbers for cheques and documents.
- Roman numerals and time: use the Roman numeral converter and the time zone converter.
Check every conversion
Ask whether the answer should be bigger or smaller than what you started with. A kilogram is heavier than a pound, so the pound figure should be larger; a centimetre is shorter than an inch, so the centimetre figure should be larger. For time zones, remember that daylight saving dates differ between countries. Our conversion guides explain the rules step by step.
Guides and articles
- How to Measure Body Fat at Home With a Tape MeasureMeasure your body fat percentage at home with a tape measure and the U.S. Navy method: where to measure, worked examples, accuracy and other methods compared.
- How to Convert HEX to RGB (and RGB to HEX) by HandConvert HEX colour codes to RGB and back step by step, including shorthand and 8-digit alpha codes, with worked examples, CSS tips and a contrast check.
- How to Convert Binary to Decimal (and Decimal to Binary)Convert binary to decimal and decimal to binary step by step using place values and repeated division, with worked examples, a powers-of-two table and tips.
- How to Write Numbers in Words on a Check (With Examples)How to write a check amount in words: dollars and cents, hyphens, when to use and, examples from $5 to $10,000, and why words beat numbers.
- Unit Conversion Cheat Sheet: Metric and ImperialHandy conversion factors for length, weight, volume and temperature, plus tips for converting without mistakes.
- Date Calculations: Days Between Dates and AgeHow to count days between dates, calculate exact age, handle leap years and business days, and convert times across zones.
