单位转换
即时、私密且免费
数据大小换算器.
在位、字节、KB、MB、GB、TB和PB之间转换——以及在十进制(1,000)和二进制(1,024)标准之间转换，这也是为什么您的新硬盘看起来比宣传的要小。
输入数值
输入时结果会更新。
使用方法
KB = 1,000 字节（SI 十进制标准，硬盘制造商在包装盒上标注的标准）。KiB = 1,024 字节（IEC 二进制标准，您的操作系统实际显示的标准）。这一差距会逐级累积，因此一块1 TB的硬盘在 Windows 中显示约为931 GB。
8比特 = 1字节。网络速度以比特每秒（Mbps）表示，而文件大小以字节（MB）表示，因此一条100 Mbps的线路最快下载速度约为12.5 MB/s。
内存容量始终以二进制单位计量，大多数操作系统的文件大小也是如此，即使标签显示的是MB或GB。
常见问题
Is 1 GB 1000 MB or 1024 MB?
Both answers are used, which is the whole confusion. Under the SI decimal standard, 1 GB = 1,000 MB — this is what hard drive, SSD and USB manufacturers print on the box. Under the binary standard, 1 GiB = 1,024 MiB, and that is what your operating system reports. Use the decimal/binary toggle on this page to switch between them.
Why does my 1 TB hard drive only show 931 GB?
The manufacturer sold you 1 TB = 1,000,000,000,000 bytes (decimal). Windows then divides by 1,024 three times and labels the result 'GB' even though it is really GiB: 1,000,000,000,000 / 1024³ ≈ 931. No storage is missing — the two sides are just using different definitions of the same word.
What is the difference between KB and KiB?
KB (kilobyte) is 1,000 bytes under the SI standard. KiB (kibibyte) is 1,024 bytes under the IEC standard introduced in 1998 specifically to remove this ambiguity. The gap is 2.4% at the kilobyte level but compounds to about 10% by the terabyte level.
How many MB is a GB for file sizes on my computer?
On Windows and most Linux file managers, treat 1 GB as 1,024 MB, because those systems report binary sizes under decimal labels. macOS has used true decimal units (1 GB = 1,000 MB) since OS X 10.6, so a file's reported size differs slightly between the two platforms.
Why is my 100 Mbps internet only downloading at 12 MB/s?
Network speeds are quoted in bits per second, file transfers in bytes per second, and there are 8 bits in a byte. 100 Mbps ÷ 8 = 12.5 MB/s, which is the theoretical maximum before protocol overhead. Switch the 'from' unit to bits on this page to convert between the two.