Zone · 13 rides
Converters
Units, number systems, colours, codes and sizes converted both ways.
- Length ConverterConvert lengths between metric and imperial units with exact factors (1 in = 25.4 mm, 1 mi = 1.609344 km) and see the value in every unit from nanometres to light-years.
- Weight ConverterConvert mass between kg, g, lb, oz, stone, US and UK tons, grains and carats with exact factors (1 lb = 0.45359237 kg). Every unit shown at once, plus lb/oz readings.
- Temperature ConverterConvert between °C, °F, K and °R with the formula shown step by step (°F = °C × 9/5 + 32), a reference table from −40 to 250 °C and an absolute-zero check.
- Binary, Decimal & Hex ConverterConvert whole numbers between binary, octal, decimal, hex and any base 2–36. Any size (BigInt), negatives with a two’s-complement view, and every digit’s place value.
- RGB to HEX ConverterConvert colours between RGB, HEX, HSL, HSV and CMYK with a live preview. Paste #abc, rgb() or hsl(), copy every CSS syntax and get the matching CSS colour name.
- Roman Numerals ConverterConvert numbers from 1 to 3999 to Roman numerals and back. Shows the symbol-by-symbol breakdown and explains malformed numerals such as IIII or IC with the correct form.
- Number to WordsSpell any number up to one quadrillion in English: cardinal, ordinal, currency words and cheque style, in American or British “and” form, with decimals and negatives.
- Time Zone ConverterConvert a date and time between any two time zones, with each zone’s UTC offset and daylight-saving status, plus a four-zone meeting planner for overlapping hours.
- Odds ConverterConvert betting odds between decimal, fractional, American, Hong Kong, Indonesian and Malay formats, with implied probability, payout for a stake and the overround.
- Shoe Size ConverterConvert men’s, women’s and kids’ shoe sizes between US, UK, EU, Japan and Mondopoint, or find your size from foot length in cm. Based on ISO/TS 19407; brands vary.
- Morse Code TranslatorTranslate text to International Morse code and back – letters, digits, punctuation and prosigns – and play it as sound or a flashing light at your own speed and tone.
- Tire DOT Code DecoderDecode the last four digits of a tire’s DOT code into its production week, year and age today, with the 6- and 10-year replacement guidance from NHTSA and tire makers.
- 3MF to STL ConverterOpen a 3MF file in your browser, rotate it in a 3D preview, see objects, triangle counts and dimensions, and download a binary STL – nothing is uploaded.