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Signed Binary To Decimal Converter

Convert signed binary to decimal with step-by-step mathematical calculations, reference lookup tables, and code snippets. Free online tool.

Signed Binary To Decimal Calculator

二进制 (Base 2)
00101010
十进制 (Base 10)
42
十六进制 (Base 16)
0x2A
八进制 (Base 8)
52
数学计算步骤拆解 (分步详解)
42 in Decimal (Base 10) ➔ Binary: 42 = 32 + 8 + 2 = (1 × 2⁵) + (0 × 2⁴) + (1 × 2³) + (0 × 2²) + (1 × 2¹) + (0 × 2⁰) = 101010₂ ➔ Hexadecimal: 42 ÷ 16 = 2 remainder 10 ('A') = 0x2A₁₆ ➔ Octal: 42 ÷ 8 = 5 remainder 2 = 52₈

通用位转换与数字对照矩阵

二进制、十六进制、十进制、八进制和 ASCII 字符的通用快速对照表。

十进制 (Base 10) 二进制 (Base 2) 十六进制 (Base 16) 八进制 (Base 8)
0 0000 0x0 0
1 0001 0x1 1
2 0010 0x2 2
3 0011 0x3 3
4 0100 0x4 4
5 0101 0x5 5
6 0110 0x6 6
7 0111 0x7 7
8 1000 0x8 10
9 1001 0x9 11
10 1010 0xA 12
11 1011 0xB 13
12 1100 0xC 14
13 1101 0xD 15
14 1110 0xE 16
15 1111 0xF 17

代码片段

Python 
# Convert number across bases
num = 42
print(bin(num))  # Binary: 0b101010
print(hex(num))  # Hex: 0x2a
print(oct(num))  # Octal: 0o52
JavaScript 
// Convert number across bases
const num = 42;
console.log(num.toString(2));  // Binary: "101010"
console.log(num.toString(16)); // Hex: "2a"
console.log(num.toString(8));  // Octal: "52"

二进制工具