Convert MB to GB, bytes to KB, and all file size units free online. Supports both decimal (SI) and binary (IEC) standards. No signup needed.
Need to convert MB to GB online? Enter any file size and this free file size calculator shows the equivalent in every unit simultaneously — bytes, KB, MB, GB, TB, and PB — so you never need to calculate twice. The tool supports both the decimal (SI) standard used in hard drive marketing (1 GB = 1,000 MB) and the binary (IEC) standard used by operating systems (1 GiB = 1,024 MiB). This is why a "1 TB" hard drive shows up as only ~931 GB in Windows — and this tool lets you check both calculations at once. Toggle between SI and IEC standards with one click to see how the same storage amount is represented in each system. Useful for developers checking API payload sizes, IT professionals sizing storage systems, and anyone trying to understand why their storage shows less space than advertised. All conversions update instantly. No account, no download, works on any device.
The File Size Converter converts between all standard digital storage units — bits, bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes — instantly. It supports both the SI (decimal) standard used by storage manufacturers and the IEC (binary) standard used by operating systems. In the SI system, 1 kilobyte = 1,000 bytes. In the binary IEC system, 1 kibibyte (KiB) = 1,024 bytes. This distinction explains why a 500 GB hard drive shows as ~465 GiB in Windows — the OS counts in binary while the manufacturer labels in decimal. Enter any value in any field and the tool recalculates all other units simultaneously.
Formula
SI (decimal): 1 KB = 10³ B, 1 MB = 10⁶ B, 1 GB = 10⁹ B, 1 TB = 10¹² B IEC (binary): 1 KiB = 2¹⁰ B = 1,024 B, 1 MiB = 2²⁰ B, 1 GiB = 2³⁰ B, 1 TiB = 2⁴⁰ B
| Unit | Symbol | Standard | Bytes |
|---|---|---|---|
| Bit | b | — | 0.125 |
| Byte | B | — | 1 |
| Kilobyte | KB | SI | 1,000 |
| Kibibyte | KiB | IEC | 1,024 |
| Megabyte | MB | SI | 1,000,000 |
| Mebibyte | MiB | IEC | 1,048,576 |
| Gigabyte | GB | SI | 1,000,000,000 |
| Gibibyte | GiB | IEC | 1,073,741,824 |
| Terabyte | TB | SI | 1,000,000,000,000 |
| Tebibyte | TiB | IEC | 1,099,511,627,776 |
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