Data Storage Converter

Pick a unit system — Decimal (1000) or Binary (1024) — and convert between bits, bytes and every multiple of them. The two systems are kept firmly apart, because 1 GB and 1 GiB are not the same size.

Storage unit system

Decimal (1000) kB • MB • GB • TB Each unit is 1,000 times the one before it. Binary (1024) KiB • MiB • GiB • TiB Each unit is 1,024 times the one before it. Both GB → GiB, MiB → MB … Every unit, grouped, for converting across the two.

Amount

Decimal places

From

Understanding storage units

Decimal (1000)

kB, MB, GB and TB are decimal units. Each one is 1,000 times the unit before it.

1 GB = 1,000 MB

Binary (1024)

KiB, MiB, GiB and TiB are binary units. Each one is 1,024 times the unit before it.

1 GiB = 1,024 MiB

The same four steps, side by side
Binary	Bytes	Decimal	Bytes
1 KiB	1,024	1 kB	1,000
1 MiB	1,048,576	1 MB	1,000,000
1 GiB	1,073,741,824	1 GB	1,000,000,000
1 TiB	1,099,511,627,776	1 TB	1,000,000,000,000

This is why a drive sold as “1 TB” shows up as about 931 GiB: the drive is 1,000,000,000,000 bytes, and the operating system is counting in 1,024s.

Need something other than file sizes? The Unit Converter handles length, weight, temperature, volume and eleven more categories.

How to Use the Data Storage Converter

Choose the decimal system, which counts in thousands, or the binary system, which counts in 1024s.
Pick the unit you have and the unit you want.
Type your value and read the result.

What You Can Do

Convert between bytes, KB, MB, GB, TB and beyond.
Convert binary units such as KiB, MiB, GiB and TiB using multiples of 1024.
Convert across systems, so you can see what a manufacturer’s GB is in GiB.
Switching system keeps the same amount of data rather than reusing the number.

Frequently Asked Questions

Why does a 1 TB drive show as about 931 GB?

The manufacturer counts a terabyte as a trillion bytes. The operating system divides by 1024 three times, which gives roughly 931 of its units.

What is the difference between MB and MiB?

A megabyte is a million bytes. A mebibyte is 1,048,576 bytes, about five per cent more.

How many MB are in a GB?

A thousand in the decimal system, or 1024 MiB in a GiB if you are working in binary units.

Are bits and bytes the same thing?

No. There are eight bits in a byte, which is why a 100 Mbps connection downloads at roughly 12.5 MB per second.