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📝 How it works:
Convert data sizes: bit, byte, kB, MB, GB, TB and binary KiB, MiB, GiB. Decimal (1000) vs. binary (1024).
Fill in the fields below and click "Calculate".
Convert data sizes: bit, byte, kB, MB, GB, TB and binary KiB, MiB, GiB. Decimal (1000) vs. binary (1024).
Fill in the fields below and click "Calculate".
Data sizes are built on the bit (1 byte = 8 bits). Decimal units (kB, MB, GB) count in steps of a thousand, while binary units (KiB, MiB, GiB) count in steps of 1024. Because hard drives are advertised in decimal but shown in binary by the system, storage appears smaller than expected. This converter shows every unit at a glance.
Why does my drive show less space? GB vs. GiB
Manufacturers count in decimal units (1 GB = 1,000,000,000 bytes), while Windows displays binary units (1 GiB = 1,073,741,824 bytes) but labels them “GB”. That is why a 1 TB drive shows up as about 931 GB.
| Advertised size | Shown by the operating system | Apparently “missing” |
|---|---|---|
| 64 GB | 59.6 GiB | 6.9 % |
| 128 GB | 119.2 GiB | 6.9 % |
| 256 GB | 238.4 GiB | 6.9 % |
| 512 GB | 476.8 GiB | 6.9 % |
| 1 TB | 0.91 TiB (931 GiB) | 6.9 % |
| 2 TB | 1.82 TiB (1,863 GiB) | 6.9 % |
| 4 TB | 3.64 TiB (3,725 GiB) | 6.9 % |
| 8 TB | 7.28 TiB (7,451 GiB) | 6.9 % |
Rule of thumb: decimal size × 0.931 = GiB (for TB × 0.909 = TiB).
