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Number

Written in

Also show in base

Upper-case letters (FF instead of ff)

How to convert between number bases

Type the number and choose the base it is written in.
Read it in binary, octal, decimal and hexadecimal (and one more base of your choice).
Copy the results.

Numbers of any length are converted exactly; they are not rounded like in most calculators.
Prefixes such as 0x (hex), 0b (binary) and 0o (octal) are understood, and spaces or underscores are ignored.
Two's complement shows how a negative number is stored in 8, 16, 32 and 64 bits.
Bases above 10 use letters after 9: a = 10, b = 11, up to z = 35.

Computers store negative numbers in two's complement: −1 in 8 bits is all ones (255 if read as unsigned).

No. The calculation happens in your browser as you type; nothing is sent anywhere.