Data size converter
Convert data sizes — bits, bytes and KB/KiB, MB/MiB, GB/GiB, TB/TiB, PB/PiB — and make the 1000 versus 1024 distinction explicit.
Runs in your browserEvery computation happens in your browser — your data never leaves this device.
Result
The source to target line first, then every common unit.
Enter a data size to convert
Units: 0
What this tool does
- Explain why a 1 TB drive shows about 931 GiB in the OS — vendors use 1000, systems use 1024.
- Convert before estimating transfer time: a 100 Mbps line is about 12.5 MB/s.
- Check constants before coding: 1 KiB = 1024 B and 1 KiB = 1.024 kB.
Example
Input
1
Output
千字节（1000） (kB) → 千字节（1024） (KiB)：1 kB = 0.976563 KiB 比特 (bit) = 8000 bit 字节 (B) = 1000 B 千字节（1000） (kB) = 1 kB 千字节（1024） (KiB) = 0.976563 KiB 兆字节（1000） (MB) = 0.001 MB 兆字节（1024） (MiB) = 0.000954 MiB 吉字节（1000） (GB) = 0.000001 GB 吉字节（1024） (GiB) = 0.000001 GiB 太字节（1000） (TB) = 0 TB 太字节（1024） (TiB) = 0 TiB 拍字节（1000） (PB) = 0 PB 拍字节（1024） (PiB) = 0 PiB
1 KiB = 1024 B and 1 KB = 1000 B — a 2.4% gap; drive vendors use 1000, operating systems use 1024.
Frequently asked questions
What exactly is the difference between KB and KiB?
KB counts 1000 bytes while KiB counts 1024, so 1 KiB = 1.024 KB. This is the classic gotcha: a drive sold as 1 TB (10¹² B) shows about 931 GiB in an OS that uses 2⁴⁰ B per TiB.
Why is a “MB” sometimes 1048576 bytes?
That is a MB used as a MiB. IEC 80000-13 reserves KB/MB/GB for powers of 1000 and KiB/MiB/GiB for powers of 1024. Windows historically used 1024 while writing KB/MB, which caused the confusion; this tool lists both.
How do bits relate to bytes?
1 byte = 8 bits. Bandwidth is quoted in bits per second (100 Mbps) while downloads show bytes per second (12.5 MB/s), so divide by 8.
Is the precision enough?
Yes. 1 PB in bits is 8 × 10¹⁵, still inside the JavaScript safe integer range. Values print via Number(value.toFixed(6)) and integer conversions stay exact.
Keywords：数据大小换算KB MB GB 换算KiBMbps硬盘容量字节1024 还是 1000data size converter