How to use
- Enter a number in any field: decimal, hexadecimal, octal or binary.
- All other representations are calculated instantly – for arbitrarily large numbers.
- For other systems, choose a base (2–36) in the last field.
Number systems in brief
The decimal system uses 10 digits, binary only 0 and 1 – the way computers work. Hexadecimal (0–9, A–F) packs 4 bits into one digit and is used for color codes, memory addresses and bytes.
Example: 255 decimal = FF hex = 11111111 binary = 377 octal. Prefixes like 0x, 0b and 0o are detected automatically when pasting.
Frequently asked questions
How large can numbers be?
Arbitrarily large. The tool uses BigInt and isn't limited to 32 or 64 bits.
Are negative numbers supported?
Yes, with a leading minus sign. Two's complement isn't calculated.
Can I use spaces for grouping?
Yes, spaces and underscores are ignored, e.g. 1111 0000.