This data storage units chart lists digital information sizes from a single bit up to a yottabyte. A byte is 8 bits; each larger unit is 1,000× the previous in decimal (SI), or 1,024× in binary (KiB, MiB, GiB).
| Unit | Symbol | Size |
|---|---|---|
| Bit | b | A single 0 or 1 |
| Nibble | — | 4 bits |
| Byte | B | 8 bits |
| Kilobyte | KB | 1,000 bytes (KiB = 1,024) |
| Megabyte | MB | 1,000 KB |
| Gigabyte | GB | 1,000 MB |
| Terabyte | TB | 1,000 GB |
| Petabyte | PB | 1,000 TB |
| Exabyte | EB | 1,000 PB |
| Zettabyte | ZB | 1,000 EB |
| Yottabyte | YB | 1,000 ZB |
Decimal vs binary
Storage makers use decimal (1 KB = 1,000 bytes); operating systems often use binary (1 KiB = 1,024 bytes). That is why a "1 TB" drive shows as about 931 GiB.