進数変換ツール
2進数、8進数、10進数、16進数を即座に相互変換します。
いずれかのフィールドに数値を入力すると、すべての進数が即座に更新されます。
Binarybase 2
0b
Octalbase 8
0o
Decimalbase 10
Hexbase 16
0x
クイックリファレンス（0〜15）
Dec
Bin
Oct
Hex
0
0
0
0
1
1
1
1
2
10
2
2
3
11
3
3
4
100
4
4
5
101
5
5
6
110
6
6
7
111
7
7
8
1000
10
8
9
1001
11
9
10
1010
12
A
11
1011
13
B
12
1100
14
C
13
1101
15
D
14
1110
16
E
15
1111
17
F
What Is Number Base Converter?
Number Base Converter is a free online tool that converts numbers between binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16). These four number systems are fundamental in computer science and programming — binary is used at the hardware level, hexadecimal is common in memory addresses and color codes, and octal appears in Unix file permissions. Type a value in any field and all others update instantly.
How to Use Number Base Converter
- Type a number into any of the four input fields (Binary, Octal, Decimal, or Hex).
- All other fields update instantly with the converted values.
- Click Copy next to any field to copy that value to clipboard.
- Click Clear to reset all fields.
Features
- Convert between binary, octal, decimal, and hexadecimal
- Type in any field — all others update in real time
- Copy any result to clipboard individually
- Quick reference table for 0–15
- Runs entirely in your browser — no data uploaded
FAQ
Which number bases does this tool support?
The tool supports binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16).
Can I type in any field to convert?
Yes. Type a number in any of the four fields and all other fields update instantly.
Does it support negative numbers or fractions?
The tool currently supports non-negative integers only.