基数変換 計算ツール

2進・8進・10進・16進・ビットシフト

Required Parameters

bits

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Quick Answer

Hex maps to binary: each hex digit = 4 bits. FF = 11111111 = 255. Common values: 0xFF = 255, 0xFFFF = 65535, 0xFFFFFFFF = 4.29 billion. Convert binary to decimal by summing powers of 2. Two's complement: invert bits and add 1 for negative numbers.

Documentation

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Calculadora de Conversao de Bases Numericas

Converta numeros entre binario, octal, decimal e hexadecimal.

Design Notes

Number base conversion is fundamental for embedded programming, memory addressing, register configuration, and protocol analysis. Hex is the standard for displaying binary data because it aligns perfectly with 4-bit nibble boundaries.

Common Mistakes

  • 1

    Mixing up 0x (hex prefix) with 0 (decimal) — 0x10 = 16, not 10.

  • 2

    Forgetting two's complement for signed integers — 0xFF is 255 unsigned but -1 signed (8-bit).

  • 3

    Using octal (0o prefix) accidentally in JavaScript by adding a leading zero to what should be a decimal number.

Knowledge Base

16進数のFFは?

FF = 10進で255 = 2進で11111111。8ビットバイトの最大値。16進1桁 = 4ビット。

2進→10進の変換方法は?

右から各桁が2の累乗:2⁰=1, 2¹=2, 2²=4... 例:10110 = 16+4+2 = 22。

なぜプログラマーは16進を使う?

16進は2進に完全に対応(1桁=4ビット)。メモリアドレス、カラーコード、レジスタ値の表示に最適。

2の補数とは?

負数の表現:全ビット反転して+1。8ビットで-1 = 0xFF。範囲:-128〜+127。

ビットシフトの仕組みは?

左にN = 2^N倍。右にN = 2^Nで割る。CPUの高速演算の基礎。