Data Units

Data unit converter

Convert between bit, byte, KB, MB, GB, TB and beyond.

Value

Unit

Standard

SI vs. IEC

SI units (KB, MB...) use powers of 1000, matching how storage vendors label drive capacity. IEC units (KiB, MiB...) use powers of 1024, matching how operating systems actually report free space — which is exactly why a "1 TB" drive shows less than 1 TiB in your file explorer.

Exact Rational Arithmetic

Conversions are computed as exact fractions using BigInt numerators/denominators, not floating point — so results stay accurate even at Yottabyte scale.