Gigabyte to Megabyte Converter (GB to MB)

Please provide values below to convert Gigabyte (GB) to Megabyte (MB), or vice versa.

Conversion: 1 Gigabyte (GB) = 1000 Megabyte (MB)
fast & accurate unit converter

Gigabyte to Megabyte Conversion Formula

The conversion formula is:

1 GB = 1,000 MB

Or simply:

GB × 1,000 = MB

This conversion uses byte-based factors: 1 GB = 1,000,000,000 B and 1 MB = 1,000,000 B.

Gigabyte to Megabyte Conversion Table

This table uses decimal file size units, where 1 GB = 1000 MB.

Gigabytes Megabytes
0.001 GB1 MB
0.005 GB5 MB
0.01 GB10 MB
0.0w GB20 MB
0.025 GB25 MB
0.04 GB40 MB
0.05 GB50 MB
0.075 GB75 MB
0.1 GB100 MB
0.25 GB250 MB
0.5 GB500 MB
0.75 GB750 MB
1 GB1,000 MB
1.5 GB1,500 MB
2 GB2,000 MB
5 GB5,000 MB
8 GB8,000 MB
10 GB10,000 MB
16 GB16,000 MB
25 GB25,000 MB
32 GB32,000 MB
50 GB50,000 MB
64 GB64,000 MB
100 GB100,000 MB
128 GB128,000 MB
256 GB256,000 MB
512 GB512,000 MB

When to Convert Gigabytes to Megabytes

Gigabyte to megabyte conversions are useful for file sizes, device storage, downloads, uploads, cloud storage, network data, backups, and software development.

Gigabyte to Megabyte Conversion FAQ

Why do many people still use 1 GB = 1,024 MB?

Many people still say 1 GB = 1,024 MB because early computer systems organized memory and storage using powers of two. Since 1,024 equals 210 and is close to 1,000, the metric prefixes kilobyte, megabyte, and gigabyte were historically reused for binary quantities.

This created two competing interpretations:

  • Decimal definition: 1 kB = 1,000 bytes, 1 MB = 1,000,000 bytes, and 1 GB = 1,000,000,000 bytes.
  • Traditional binary interpretation: 1 KB was often treated as 1,024 bytes, 1 MB as 1,024 KB, and 1 GB as 1,024 MB.

To remove this ambiguity, dedicated binary prefixes were introduced:

  • 1 KiB = 1,024 bytes
  • 1 MiB = 1,024 KiB = 1,048,576 bytes
  • 1 GiB = 1,024 MiB = 1,073,741,824 bytes

Under current standards, GB and MB are decimal units, so 1 GB = 1,000 MB. The precise binary statement is 1 GiB = 1,024 MiB. Therefore, saying “1 GB = 1,024 MB” mixes the historical binary convention with modern decimal unit names.

The older usage remains widespread because it was used for decades in operating systems, memory specifications, programming documentation, and technical education. Some software may also calculate capacity using binary values while displaying decimal-looking labels such as MB or GB, which reinforces the confusion.

This distinction explains why a storage device can appear smaller when viewed in some operating systems. For example, a manufacturer-defined 1 TB drive contains 1,000,000,000,000 bytes. That same number of bytes equals approximately 931.32 GiB. No storage has disappeared—the capacity is simply being expressed with a different unit.

For accurate conversions, use kB, MB, GB, and TB for decimal powers of 1,000, and use KiB, MiB, GiB, and TiB for binary powers of 1,024.

How many megabytes are in 1 gigabyte?

1 GB equals 1,000 MB.

How do I convert gigabytes to megabytes?

Multiply the number of gigabytes by 1,000. For example, 10 GB = 10,000 MB.

What is 100 GB in MB?

100 GB = 100,000 MB.

How many gigabytes are in 1 megabyte?

1 MB equals 0.001 GB.

Learn more from the IEC guide to units and binary prefixes and NIST’s binary-prefix guide .