Bytes Converter

Convert between bytes, KB, MB, GB and TB.

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About Bytes Converter

Converts between B, KB, MB, GB and TB, switching between the 1000 and 1024 conventions.

Byte units: the 1000 and 1024 families

Bytes come in two families: powers of 1000 (SI, used by drive makers and network speeds) and powers of 1024 (IEC, used by operating systems and memory). The tool above switches between them; the table below gives the exact values and how far the two drift apart.

Decimal — powers of 1000 (SI)

1 kB
1,000 bytes. In SI the prefix is a lowercase k — capital K is kelvin. Drive capacity, USB sticks and network speeds all use this set.
1 MB
1,000,000 bytes, or 1,000 kB.
1 GB
1,000,000,000 bytes, or 1,000 MB.
1 TB
1,000,000,000,000 bytes, or 1,000 GB. This is the number printed on a drive.

Binary — powers of 1024 (IEC)

1 KiB
1,024 bytes. The IEC names insert an i into the SI ones: KiB, MiB, GiB, TiB.
1 MiB
1,048,576 bytes, or 1,024 KiB.
1 GiB
1,073,741,824 bytes, or 1,024 MiB.
1 TiB
1,099,511,627,776 bytes, or 1,024 GiB.

How far apart they drift

1 kB ↔ 1 KiB
2.4% apart — 1,000 vs 1,024.
1 MB ↔ 1 MiB
4.86% apart — 1,000,000 vs 1,048,576.
1 GB ↔ 1 GiB
7.37% apart — 1,000,000,000 vs 1,073,741,824.
1 TB ↔ 1 TiB
9.95% apart. A drive sold as 1 TB holds exactly 1,000,000,000,000 bytes, which reads as 931 GiB in binary units — that gap is the whole reason a new drive looks smaller.
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