Data size converter — bytes, KB, MB, GB, TB and more

A kilobyte (KB) in the SI standard equals 1000 bytes (decimal), while a kibibyte (KiB) in the IEC standard equals 1024 bytes (binary). The gap widens at higher units — 1 GiB = 1,073,741,824 B, while 1 GB = 1,000,000,000 B.

In the decimal SI system: 1 GB = 1,000,000,000 bytes. In the binary IEC system: 1 GiB = 1,073,741,824 bytes. Hard-drive manufacturers use GB (SI), which is why an OS shows less capacity than advertised.

In SI: divide megabytes by 1000. For example, 2500 MB ÷ 1000 = 2.5 GB. In IEC: divide mebibytes by 1024. For example, 2048 MiB ÷ 1024 = 2 GiB.

Manufacturers label drives in GB (1 GB = 10⁹ B), but operating systems historically displayed storage in GiB (1 GiB = 2³⁰ B ≈ 1.074 × 10⁹ B) while calling it "GB". A 1 TB drive shows ≈ 931 GiB. No space is lost — it is a difference in definitions.

1 TB (SI) = 1000 GB. 1 TiB (IEC) = 1024 GiB ≈ 1099.5 GB. The converter calculates both automatically based on the selected input unit.

A petabyte (PB) is 10¹⁵ bytes (1000 TB) in SI, or 1024 TiB in IEC (PiB). It is used by data centres, cloud providers (AWS, Google, Azure) and large scientific institutions such as CERN.

In SI: divide by 1000. For example, 5000 B = 5 KB. In IEC: divide by 1024. For example, 5120 B = 5 KiB. Enter the byte value and select B as the input unit.

Bit (b) → Byte (B, 8 bits) → Kilobyte (KB) → Megabyte (MB) → Gigabyte (GB) → Terabyte (TB) → Petabyte (PB) → Exabyte (EB) → Zettabyte (ZB) → Yottabyte (YB). IEC equivalents: KiB → MiB → GiB → TiB → PiB → EiB → ZiB → YiB.

1 GB (SI) = 1000 MB. 1 GiB (IEC) = 1024 MiB. The common shorthand "1 GB = 1024 MB" technically refers to 1 GiB = 1024 MiB. The IEC standard was introduced precisely to resolve this ambiguity.

Internet speed is measured in megabits per second (Mbps or Mbit/s), not megabytes (MB/s). To convert to megabytes, divide by 8. A 100 Mbps connection downloads at up to 12.5 MB/s. This converter handles storage size, not speed.