File Size Converter
Convert between Bytes, KB, MB, GB, TB and more in both decimal and binary units.
File Size Converter – Bytes, KB, MB, GB, TB Explained
Our file size converter handles both decimal (SI) and binary (IEC) unit systems, which are often confused. Hard drive manufacturers use decimal units (1 GB = 1,000,000,000 bytes) while operating systems traditionally use binary units (1 GiB = 1,073,741,824 bytes) — which is why a "1 TB" hard drive shows as slightly less in Windows.
Decimal vs Binary File Size Units
| Decimal (SI) | Binary (IEC) | Difference |
|---|---|---|
| 1 KB = 1,000 bytes | 1 KiB = 1,024 bytes | 2.4% |
| 1 MB = 1,000,000 bytes | 1 MiB = 1,048,576 bytes | 4.9% |
| 1 GB = 1,000,000,000 bytes | 1 GiB = 1,073,741,824 bytes | 7.4% |
| 1 TB = 1,000,000,000,000 bytes | 1 TiB = 1,099,511,627,776 bytes | 10% |