MB to GB Storage Converter

By Suraj GiriUpdated 16 September 2026

In decimal storage units 1 GB is 1,000 MB, so divide megabytes by 1,000 to get gigabytes. In binary units 1 GiB is 1,024 MiB.

This page converts storage from megabytes to gigabytes and leads with the decimal answer, because MB and GB carry SI prefixes, which stand strictly for powers of ten. The binary answer beside it is the count Windows File Explorer shows under the same GB label.

Going the other way? Convert GB back to MB →

How do you convert MB to GB?

MB to GB conversion divides by 1,000, because one gigabyte is 1,000 megabytes in the decimal prefixes; in binary units one gibibyte is 1,024 mebibytes, so the divisor becomes 1,024.

1. Type the number of megabytes into the box at the top of the page.
2. Divide it by 1,000, the number of megabytes in one gigabyte.
3. Read the decimal answer in GB, the reading the symbols MB and GB carry in the SI.
4. If the figure was counted in steps of 1,024, read the binary answer beside it instead: the same number divided by 1,024, in GiB.

Megabytes and gigabytes are two rungs of one ladder; to work across the whole storage ladder, including the binary units, use the full storage converter.

MB to GB Conversion Table

Each row gives the decimal answer and, beside it, the binary answer for the same figure read as MiB. Every value in it is exact.

Worked Example: 1,024 MB to GB

The first question for this page, worked both ways. Each reading passes through bytes, which is where the two part company.

A megabyte is 1,000,000 bytes and a mebibyte is 1,048,576, so the same figure lands on two different byte counts before it is divided again.

Check it in reverse

Run each answer back through its own step and the starting figure returns: 1.024 GB x 1,000 = 1,024 MB, and 1 GiB x 1,024 = 1,024 MiB. To verify any other value, read the gigabytes back as megabytes and compare the result with the figure you started from.

Worked Examples: MB to GB

Each example gives the value first, then the working. Click a value to load it in the converter.

Every example above runs the other way too - turn each GB answer back into MB.

Where These Factors Come From

The factors and rules above are read from the knowledge base rather than typed for the page. These are the lines it holds for this pair.

• megabyte (decimal), factor to byte 1000000
• gigabyte (decimal), factor to byte 1000000000
• mebibyte, factor to byte 1048576
• gibibyte, factor to byte 1073741824
• SI Brochure (BIPM 9th edition) section 3, prefix rule The SI prefixes refer strictly to powers of 10. They should not be used to indicate powers of 2 (for example, one kilobit represents 1000 bits and not 1024 bits).
• binary prefixes, adoption The prefixes kibi (Ki), mebi (Mi), gibi (Gi) and tebi (Ti) stand for 2^10, 2^20, 2^30 and 2^40. The IEC first adopted them in 1999, as Amendment 2 to IEC 60027-2, and they are now part of IEC 80000-13.
• How this page reports a result result in the target unit, decimal (SI) reading first and binary (IEC) reading beside it where the prefixes differ; printed in full where it fits in 10 significant figures, otherwise rounded to 10

Why Is Memory Counted in Steps of 1,024?

JEDEC's dictionary defines kilo (K), mega (M) and giga (G), as prefixes to units of semiconductor storage capacity, as 1024, 1024^2 and 1024^3, and says these power-of-two definitions are included only to reflect common usage.

That is how a memory module and a storage drive come to use the same letters for different sizes. Read a memory figure in the binary column, and any other figure in the decimal one unless you know it was counted in steps of a power of two.

Frequently Asked Questions

Related Conversions

• MB to KB multiplies by 1,000 - convert megabytes to kilobytes.
• KB to GB divides by 1,000,000 - change a kilobyte count into gigabytes.
• GB to TB divides by 1,000 - convert gigabytes to terabytes.
• KB to MB divides by 1,000 - convert kilobytes to megabytes.
• TB to GB multiplies by 1,000 - convert terabytes to gigabytes.
• GB to KB multiplies by 1,000,000 - break gigabytes down into kilobytes.

The other storage units, including bits and the binary units, are on the converter that holds every storage unit.