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File Size Converter

Convert file sizes between bytes, KB, MB, GB, TB, and PB. Supports both decimal (SI) and binary (IEC) units: kilobytes vs kibibytes.

Value

From Unit

= 1,024 bytes = 8,192 bits

Decimal (SI) — 1 KB = 1,000 B

Bytes (B)1,024

Kilobytes (KB)1.024

Megabytes (MB)0.001024

Gigabytes (GB)1.024e-6

Terabytes (TB)1.024e-9

Petabytes (PB)1.024e-12

Binary (IEC) — 1 KiB = 1,024 B

Bytes (B)1,024

Kibibytes (KiB)1

Mebibytes (MiB)9.766e-4

Gibibytes (GiB)9.537e-7

Tebibytes (TiB)9.313e-10

Pebibytes (PiB)9.095e-13

About File Size Converter

File sizes can be confusing because two competing systems exist: the decimal (SI) system where 1 KB = 1,000 bytes and the binary (IEC) system where 1 KiB = 1,024 bytes. Hard drive manufacturers use SI units (so a 1 TB drive has 1,000,000,000,000 bytes), while operating systems often report file sizes in binary units. A file shown as 1 GiB in Windows Explorer is 1,073,741,824 bytes, but a 1 GB measurement by a drive maker is only 1,000,000,000 bytes. This tool converts both ways so you can compare accurately.

Private & free — this tool runs entirely in your browser.