Data size converter

Convert between bits, bytes, and every common unit — decimal (SI) and binary (IEC).

Quick values

Common sizes

Decimal — SI

1 KB = 1,000 B · storage marketing, network speeds

Binary — IEC

1 KiB = 1,024 B · OS file sizes, RAM

Decimal vs binary: Manufacturers advertise storage in decimal (1 TB = 1,000,000,000,000 bytes). Operating systems measure in binary (1 TiB = 1,099,511,627,776 bytes), so a “1 TB” drive shows as ~931 GiB in Windows/Linux. RAM is always sold and measured in binary — 16 GB of RAM = 16 GiB.

Filling a NAS? High-capacity NAS drives are engineered for always-on, multi-drive workloads — desktop drives fail early under those conditions. Seagate and WD are the go-to brands. Browse NAS drives →

All conversions run locally · No data sent