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Byte / KB / MB / GB Converter

Convert between bytes, KB, MB, GB, and TB — both SI and IEC.

Runs locally in your browser. Your input is not uploaded or stored. You can verify this in your browser’s network panel.

What does this tool solve?

KB is 1,000 bytes (SI) while KiB is 1,024 bytes (IEC) — the 2.4% difference per magnitude is why disk sizes and memory sizes never seem to agree. Convert any value across both systems here.

Continue with Number Base Converter, Timestamp Converter

What examples should you start with?

SI to IEC

Input
Bytes
1 KB
Output
Bytes
1,000 B = 0.9766 KiB

IEC to SI

Input
Bytes
1 MiB
Output
Bytes
1.0486 MB

Large values

Input
Bytes
1.5 TB
Output
Bytes
1,500,000,000,000 B = 1.3642 TiB

How does it work?

The value is normalized to bytes by multiplying with the unit's factor (powers of 1000 for SI, powers of 1024 for IEC), then divided out to every other unit.

SI units (KB, MB, GB, TB) are decimal; IEC units (KiB, MiB, GiB, TiB) are binary. Storage is usually marketed in SI, operating systems often report IEC.

What are the edge cases and limits?

  • Older docs and tools use KB to mean 1024 bytes — check which convention your source uses.
  • Network speeds are measured in bits (Mb), not bytes (MB) — divide by 8 before using this tool.
  • Very small results switch to exponential notation to stay readable.

Technical reference

Related tools

  • Number Base ConverterConvert integers between bases 2 and 64, including binary, decimal, hexadecimal, and custom bases.
  • Timestamp ConverterConvert dates and times between common formats, Unix seconds or milliseconds, and UTC.