Convert B, KB, MB, GB, TB, PB (1 KB = 1024 B).
Features
- 实时换算: 输入数值或切换单位后，所有字节值即时更新显示。
- 二进制单位支持: 支持 B、KB、MB、GB、TB、PB 等常用数据存储单位，按 1024 进位。
- 高精度计算: 保持9位小数精度，确保字节换算的准确性。
- 智能单位切换: 一键快速切换常用单位，如B、KB、MB、GB等。
Usage Guide
- 输入数值: 在左侧输入框中输入要转换的数值。
- 选择单位: 从按钮组中选择源单位类型。
- 查看结果: 在下方双列表格中查看所有转换结果。
- 复制数值: 点击单个复制按钮或一键复制所有结果。
Technical Details
二进制单位换算原理
字节换算基于计算机存储的二进制特性，采用 1024 进位制。1 KB = 1024 B，1 MB = 1024 KB，以此类推。这种设计源于计算机使用二进制（2的幂次方）存储数据的特性。
换算系数
所有换算都以字节（B）为基准单位，使用 1024 的幂次方作为换算系数（1 KB = 1024 B，1 MB = 1,048,576 B，1 GB = 1,073,741,824 B）。工具使用精确的二进制换算确保准确性。
精度处理
换算算法采用两步处理：先归一化为字节，再除以目标系数。这种方法防止累积舍入误差，保持9位小数精度。
Frequently Asked Questions
- What's the difference between KB and KiB? Why does 1 KB = 1024 bytes?
- There's an important distinction: KB (kilobyte) traditionally meant 1024 bytes in computing (2¹⁰), but the SI prefix 'kilo' officially means 1000. To resolve this ambiguity, the IEC 60027-2 standard introduced binary prefixes: KiB (kibibyte) = 1024 bytes, MiB (mebibyte) = 1024² bytes, GiB (gibibyte) = 1024³ bytes. This tool uses the traditional computing convention where 1 KB = 1024 B, which is still widely used in operating systems, memory specifications, and file systems. Some contexts (like hard drive manufacturers) use decimal (1000-based) units, which is why a '1 TB' drive shows as ~931 GB in your OS.
- Why do storage manufacturers use 1000-based units instead of 1024?
- Storage manufacturers (hard drives, SSDs) use decimal (SI) units where 1 KB = 1000 B, 1 MB = 1000² B, etc., for several reasons: 1) SI prefixes officially mean powers of 1000, making it technically correct, 2) It results in larger advertised capacities (a 1 TB drive = 1,000,000,000,000 bytes vs 1,099,511,627,776 bytes for 1 TiB), 3) It's legally accepted as long as clearly stated. However, operating systems use binary (1024-based) units for historical reasons and efficiency (powers of 2 align with computer architecture). This is why a 500 GB drive shows as ~465 GB in Windows - it's the same capacity, just measured differently.
- How do I convert between binary and decimal byte units?
- To convert between binary (1024-based) and decimal (1000-based) units: First, convert to bytes as the common base. For binary: Bytes = Value × 1024^n (where n is the unit level: KB=1, MB=2, GB=3). For decimal: Bytes = Value × 1000^n. Then convert to target unit by dividing. Example: 100 GB (decimal) to GiB (binary): 100 × 1000³ = 100,000,000,000 bytes. Then 100,000,000,000 ÷ 1024³ ≈ 93.13 GiB. This tool uses binary (1024) units throughout for consistency with most computer systems and programming applications.
- What's the maximum value this converter can handle accurately?
- JavaScript's Number type uses IEEE 754 double-precision floating-point format, which can accurately represent integers up to 2⁵³ - 1 (9,007,199,254,740,991 bytes, approximately 8 PB). Beyond this, precision may be lost due to floating-point limitations. For values larger than ~8 PB or requiring absolute precision, consider using BigInt-based converters or specialized tools. This tool maintains 9 decimal places precision for fractional results, which is sufficient for most practical purposes including TB-scale storage calculations, network bandwidth measurements, and file size conversions in typical use cases.
Related Documentation
- IEC 60027-2 - 二进制前缀标准 - 国际电工委员会关于二进制倍数前缀的标准。
- ISO/IEC 80000-13 - 信息科学和技术的量和单位 - 信息技术领域量和单位的国际标准，包含字节和比特的定义。
- NIST - 二进制前缀使用指南 - 美国国家标准与技术研究院关于二进制前缀的官方指导。
- Wikipedia - 字节 - 字节单位的详细说明和历史演变，包含 1024 vs 1000 的争议解释。
- IEEE 1541 - 二进制倍数前缀 - IEEE 关于二进制倍数前缀（KiB、MiB、GiB）的标准规范。