File Size Calculator

Convert between different file size units (KB, MB, GB, KiB, MiB, GiB)

filesizecalculatorconvertkbmbgbkibmibgibbytesstorage

File Size Input

Value

Unit

Decimal Units (1000)

Binary Units (1024)

Understanding File Sizes

Decimal vs Binary Units

Storage manufacturers use decimal units (1 KB = 1,000 bytes), while operating systems often use binary units (1 KiB = 1,024 bytes). This explains why a "1TB" drive shows as ~931GB in your OS.

Common Confusion

• 1 MB ≠ 1 MiB (difference: ~4.9%)
• 1 GB ≠ 1 GiB (difference: ~7.4%)
• 1 TB ≠ 1 TiB (difference: ~10%)

Quick Reference

Decimal (SI)

kB → MB → GB → TB → PB
(×1000 each step)

Binary (IEC)

KiB → MiB → GiB → TiB → PiB
(×1024 each step)