数据存储大小换算 Data Size Converter
输入任意存储大小与单位,选择二进制(1024)或十进制(1000)进制,一键换算 bit、B、KB、MB、GB、TB 等容量,帮助估算文件与硬盘空间。
Enter a data size and unit, choose binary (1024) or decimal (1000) base, and convert between bits, bytes,
KB, MB, GB, TB to understand file and disk capacity.
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文件大小 · File Size:
当你在电脑中看到某个视频、照片或文档显示为 “700 MB” 或 “2.3 GB”, 一般是基于二进制 1024 计算(操作系统习惯),实际换算时更接近 MiB / GiB 概念。
When your OS shows a file as “700 MB” or “2.3 GB”, it usually uses the binary base (1024), closer to MiB / GiB in strict terminology. -
硬盘/SSD/移动硬盘标称容量 · Labeled Disk Capacity:
厂商包装上的 “1 TB 硬盘” 通常按十进制 1000 计算,即 1 TB = 1000³ B, 所以接入电脑后在系统中显示会略小于 1 TB 属于正常现象。
Vendors usually use decimal (1000), so a “1 TB drive” is 1000³ bytes. Operating systems using binary math will report a slightly smaller number; this is expected. -
实际可用空间 · Usable Space:
除了进制差异,文件系统本身也会占用部分空间(例如 NTFS、APFS 等), 因此硬盘插入电脑后显示空间会再次略小。
File systems (NTFS, APFS, etc.) also reserve space, so usable capacity is smaller than the raw size. -
使用建议 · Practical Tips:
如果你在估算“还能存多少照片/视频”,建议选择二进制 1024, 更接近系统显示。
如果你在对比“硬盘包装标称 vs 实际可用”,可在 1000 与 1024 两种模式之间切换,对比差异。
Use binary (1024) for approximating how many files you can store; switch between both modes to understand why labeled and reported capacities differ.
说明:本工具用于容量换算与大致估算,不会考虑压缩率、文件系统开销、RAID 校验与冗余、
块大小浪费等复杂因素,结果仅供学习与日常测算参考。
Note: This tool focuses on pure unit conversion. It does not account for compression, filesystem
overhead, RAID parity or redundancy, or block-size waste. Results are for education and rough
estimation only.
