ToolsMaxxing

File size converter

Convert bytes, KB, MB, GB, TB and bits, in decimal and binary units.

In bytes1,500,000,000
KB (decimal, 1000)
1,500,000
MB (decimal, 1000)
1,500
GB (decimal, 1000)
1.5
TB (decimal, 1000)
0.0015
PB (decimal, 1000)
0.0000015
KiB (binary, 1024)
1,464,844
MiB (binary, 1024)
1,430.511
GiB (binary, 1024)
1.396984
TiB (binary, 1024)
0.001364242
Megabits (Mb)
12,000

Formula Decimal: 1 KB = 1000 B, 1 MB = 1000 KB. Binary: 1 KiB = 1024 B, 1 MiB = 1024 KiB. 1 byte = 8 bits.

Windows shows binary sizes but labels them KB, MB and GB, which is why a "500 GB" drive shows about 465 GB there.

How it works

  1. 1Enter the size.
  2. 2Choose its unit, from bytes up to petabytes, or bits.
  3. 3Read the value in every other unit.
  4. 4Check both the decimal and the binary rows, depending on what you are comparing.

What the options do

Decimal (KB, MB, GB)
Steps of 1000. Used by drive makers, networks and macOS.
Binary (KiB, MiB, GiB)
Steps of 1024. Used by memory and by Windows, which labels them KB, MB and GB.
Bits
Internet speeds are in bits. Eight bits make one byte.

Privacy

Everything is calculated in your browser. Nothing you enter is sent to a server.

Questions people ask

Why does my 1 TB drive show less space?

A maker's 1 TB is 1,000,000,000,000 bytes. Windows divides by 1024 three times and shows about 931 GB, even though nothing is missing.

What is the difference between MB and Mb?

MB is megabytes and Mb is megabits. A 100 Mbps connection moves at most 12.5 megabytes per second.

How long will a download take?

Divide the file size in megabits by your speed in megabits per second. A 500 MB file is 4000 megabits, so it takes about 40 seconds at 100 Mbps, ignoring overhead.

How are very large numbers shown?

With ten significant digits, switching to scientific notation for extremes.

Which is correct, 1000 or 1024?

Both, for different names. KB, MB and GB officially mean powers of 1000. KiB, MiB and GiB mean powers of 1024.

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