Convert Gigabytes to Megabytes (GB to MB)
1 gigabyte (GB) = 1000 megabytes (MB). 1 MB = 0.001 GB. Example: 1 GB = 1 × 1000 = 1000 MB.
Also searched as GB to MB, gigabytes to megabytes, gb in mb, convert GB into MB and how many MB in a GB.
1 GB = 1000 MB
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk gigabyte to megabyte converter to paste a column from Excel.
How to Convert Gigabyte to Megabyte
- 1 GB = 1000 MB
- 1 MB = 0.001 GB
- Example: convert 1 GB to MB: 1 GB = 1 × 1000 MB = 1000 MB
Formula
MB = GB × 1000
Derivation from SI units:
- 1 GB = 10⁹ bytes = 8 × 10⁹ bits (decimal, SI).
- 1 MB = 10⁶ bytes = 8 × 10⁶ bits (decimal, SI).
- 1 GB = 8000000000 bit ÷ 8000000 bit per MB = 1000 MB
Both units are defined exactly, so the factor is exact. Gigabyte definition: gigabyte; Megabyte definition: megabyte.
Worked examples
- 1 GB is 1000 MB.
1 GB × 1000 = 1000 MB - A 2.5 GB download is 2500 MB.
2.5 GB × 1000 = 2500 MB
Gigabyte to Megabyte conversion table
| Gigabytes (GB) | Megabytes (MB) |
|---|---|
| 1 GB | 1000 MB |
| 2 GB | 2000 MB |
| 4 GB | 4000 MB |
| 8 GB | 8000 MB |
| 16 GB | 16000 MB |
| 32 GB | 32000 MB |
| 64 GB | 64000 MB |
| 100 GB | 100000 MB |
| 128 GB | 128000 MB |
| 256 GB | 256000 MB |
| 500 GB | 500000 MB |
| 1000 GB | 1000000 MB |
Where it's used
Storage and data-plan figures in gigabytes are converted to megabytes to see how many photos, songs or attachments fit, or to set upload limits. Multiply by 1000.
Gigabyte to other data storage units
| Conversion | 1 GB equals |
|---|---|
| gigabyte to megabyte | 1000 MB |
| gigabyte to byte | 1000000000 B |
| gigabyte to kilobyte | 1000000 kB |
| gigabyte to terabyte | 0.001 TB |
| gigabyte to bit | 8000000000 bit |
| gigabyte to megabit | 8000 Mbit |
| gigabyte to kibibyte | 976562.5 KiB |
| gigabyte to mebibyte | 953.6743164 MiB |
Show 5 more units
| gigabyte to gibibyte | 0.9313225746 GiB |
|---|---|
| gigabyte to kilobit | 8000000 kbit |
| gigabyte to gigabit | 8 Gbit |
| gigabyte to petabyte | 0.000001 PB |
| gigabyte to tebibyte | 0.0009094947018 TiB |
Frequently asked questions
How do I convert GB to MB?
Multiply by 1000: 2.5 GB = 2500 MB. For binary units, 1 GiB = 1024 MiB.
How many 5 MB photos fit in 1 GB?
About 200: 1000 MB ÷ 5 MB.
How many megabytes are in 1 gigabyte?
1 GB = 1000 MB.
How do I convert gigabytes to megabytes?
Multiply the value in GB by 1000. For example, 1 GB × 1000 = 1000 MB.
Is the GB to MB conversion exact?
Yes. Both units are defined exactly, and 1 GB is exactly 1000 MB.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7 (SI prefixes); hertz, Table 4.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Gigabytes to Megabytes (GB to MB). Retrieved October 25, 2026, from https://scientificconverters.com/data-storage/gigabytes-to-megabytes/
IEEE
Scientific Converters, "Convert Gigabytes to Megabytes (GB to MB)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/data-storage/gigabytes-to-megabytes/