About this number base converter
Computers count in bases other than the everyday base 10. Binary (base 2) uses only 0 and 1 and is how machines store everything; hexadecimal (base 16) packs four binary digits into one and shows up in colour codes, memory addresses and byte values; octal (base 8) appears in file permissions. This number base converter ties all four together: type a value into any field — decimal, hex, binary or octal — and the other three update at once. It uses your browser's big-integer support, so it stays exact even for very large numbers that would lose precision in an ordinary calculator, and it handles a leading minus sign for negatives. Everything is worked out on your device, so nothing you enter is stored.
Frequently asked questions
- How do I convert, say, decimal to hex?
- Type your number into the Decimal field. The Hexadecimal, Binary and Octal fields fill in automatically — no button to press.
- Can it handle very large numbers?
- Yes. It uses big-integer maths, so even numbers far beyond a normal calculator's limit stay exact rather than being rounded.
- Does it accept hex letters in any case?
- Yes. Hexadecimal input accepts both upper and lower case (FF or ff), and results are shown in upper case by convention.