MB to GB Converter

Convert between megabytes and gigabytes instantly. Pick binary or decimal depending on whether you're matching what your operating system shows or what a storage manufacturer advertises.

Result
1
Conversion
1024 MB = 1 GB

How it works

There are two competing conventions for how many MB fit in a GB. The binary convention (used internally by most operating systems) treats 1 GB as 1024 MB, a power of two. The decimal convention (used by storage manufacturers and the SI system) treats 1 GB as exactly 1000 MB.

Formula
Binary: GB = MB / 1024 | Decimal: GB = MB / 1000

Example. 1024 MB is exactly 1 GB under the binary standard, but only 1.024 GB under the decimal standard.

MB to GB chart (binary, 1024 MB = 1 GB)

The binary standard is what Windows and most file managers use when they show a file size.

MBGB
100 MB0.098 GB
200 MB0.195 GB
256 MB0.250 GB
500 MB0.488 GB
512 MB0.500 GB
750 MB0.732 GB
1,000 MB0.977 GB
1,024 MB1 GB
1,500 MB1.465 GB
2,000 MB1.953 GB
2,048 MB2 GB
3,000 MB2.930 GB
4,096 MB4 GB
5,000 MB4.883 GB
8,192 MB8 GB
10,000 MB9.766 GB
16,384 MB16 GB
20,000 MB19.531 GB
32,768 MB32 GB
50,000 MB48.828 GB
65,536 MB64 GB
100,000 MB97.656 GB

MB to GB chart (decimal, 1000 MB = 1 GB)

The decimal standard is what storage makers and mobile data plans use.

MBGB
100 MB0.100 GB
200 MB0.200 GB
250 MB0.250 GB
500 MB0.500 GB
750 MB0.750 GB
1,000 MB1 GB
1,500 MB1.500 GB
2,000 MB2 GB
3,000 MB3 GB
5,000 MB5 GB
10,000 MB10 GB
20,000 MB20 GB
50,000 MB50 GB
100,000 MB100 GB

Why does my drive show less space than advertised?

A drive sold as "1 TB" uses the decimal definition (1,000,000,000,000 bytes), but your operating system typically reports free space using the binary definition, where the same number of bytes shows as about 931 GB. Nothing is missing - it's the same amount of storage measured two different ways.

Frequently asked questions

Which standard should I use?

Use binary (1024) if you're comparing to file sizes shown by Windows Explorer, macOS Finder, or most apps. Use decimal (1000) if you're comparing to a manufacturer's advertised drive or plan size, or doing a strict SI/scientific calculation.

How many MB is 1 GB?

1024 MB under the binary standard, or exactly 1000 MB under the decimal standard.

Is this the same as GiB and MiB?

The binary standard here (1024) is what GiB (gibibyte) and MiB (mebibyte) formally mean. Many operating systems label these binary values as "GB"/"MB" anyway, which is the source of most storage-size confusion.

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