DiffCheck

Byte Converter Online

Convert between bytes, KB, MB, GB, TB and binary units KiB, MiB, GiB instantly.

Decimal (SI)

B1,000,000,000
KB1,000,000
MB1,000
GB1
TB0.001
PB0.000001

Binary (IEC)

KiB976562.5
MiB953.6743164
GiB0.9313225746
TiB0.0009094947018
PiB8.881784197e-7

= 1,000,000,000 bytes

What Is a Byte Converter?

A Byte Converter instantly converts a storage size between all common byte units — bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes — in both the decimal (SI) and binary (IEC) systems. Enter any value, pick a unit, and all equivalent values update in real time. This is useful when comparing file sizes, planning storage capacity, reading API documentation, or understanding why your operating system reports a different size than the drive manufacturer advertises.

How to Use Byte Converter

  1. Enter a number in the Value field.
  2. Select the source unit from the Unit dropdown (e.g. GB).
  3. All equivalent values in decimal and binary units appear instantly below.
  4. The source unit is highlighted in blue for easy reference.

Decimal vs Binary Units

  • Decimal (SI) — KB = 10³, MB = 10⁶, GB = 10⁹, TB = 10¹², PB = 10¹⁵. Used by storage manufacturers, network speeds, and most consumer software.
  • Binary (IEC) — KiB = 2¹⁰, MiB = 2²⁰, GiB = 2³⁰, TiB = 2⁴⁰, PiB = 2⁵⁰. Used by operating systems (Linux, macOS, Windows) when reporting RAM and file sizes.

FAQ

What is the difference between MB and MiB?

MB (megabyte) is a decimal unit equal to 1,000,000 bytes (10⁶), used by storage manufacturers and network speeds. MiB (mebibyte) is a binary unit equal to 1,048,576 bytes (2²⁰), used by operating systems when reporting file sizes and RAM.

How many bytes are in a gigabyte?

A gigabyte (GB) equals 1,000,000,000 bytes (10⁹) in the decimal SI system. A gibibyte (GiB) equals 1,073,741,824 bytes (2³⁰) in the binary IEC system. Hard drive manufacturers use GB, while Windows reports disk sizes in GiB.

Why does my 1 TB hard drive show less space in Windows?

Hard drive manufacturers measure 1 TB as 1,000,000,000,000 bytes (decimal). Windows displays storage in GiB (binary), so 1 TB ÷ 1,073,741,824 ≈ 931 GiB. The drive has the advertised capacity — it is just displayed in a different unit.

What units does this converter support?

This converter supports all common byte units: B, KB, MB, GB, TB, PB (decimal/SI) and KiB, MiB, GiB, TiB, PiB (binary/IEC).