Number Conversion
Convert between number systems, color formats, fractions, and Roman numerals.
Number Conversion — About These Tools
Number conversion translates a value between representations: binary, octal, decimal, hex, Roman numerals, fractions, and color models. The math runs instantly in your browser, with full precision and no rounding surprises.
Frequently asked questions
Why do programmers use hexadecimal?
Hex maps 4 bits to one character, so it is a compact, human-readable view of binary data — memory addresses, colors, and byte values are all conventionally written in hex.
Can I convert negative numbers?
Yes, decimal inputs accept negatives and show the two’s-complement representation where relevant. Roman numerals are the exception — they have no zero or negative form.
Is the conversion exact for large numbers?
Yes. Conversions use arbitrary-precision math where the format allows it, so values beyond the 64-bit range still convert correctly.