Everyday · Conversion & Encoding
Conversion & Encoding calculators
Unit conversion, shoe sizes, Roman numerals, Base64/URL, passwords and dice.
LLM Token CounterCount tokens and estimate API cost for GPT-5.5, Claude, Gemini 3, Llama 4, DeepSeek, Grok and 60+ more LLMs.Conversion CalculatorConvert length, weight, volume, speed and temperature units.Shoe Size Conversion CalculatorConvert shoe sizes between US, UK, EU and centimeters.Roman Numeral ConverterConvert numbers to Roman numerals and back.Base64 Encode / DecodeEncode text to Base64 or decode Base64 back to text.URL Encode / DecodePercent-encode text for URLs or decode an encoded string.Password GeneratorBuild a strong random password from chosen character sets.Dice RollerRoll any number of dice with any number of sides.