Data Storage / GB → MB
Convert Gigabytes to Megabytes
Convert bit and byte counts with explicit decimal and binary prefixes. Convert Gigabytes (GB) to Megabytes (MB). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Megabytes to Gigabytes →
How to convert gigabytes to megabytes
One byte is 8 bits. Decimal kilo/mega/giga use powers of 1000; binary kibi/mebi/gibi use powers of 1024. Marketing capacity and operating-system displays can therefore differ.
Use x for the value in GB, b for the intermediate value in B, and y for the result in MB.
MB = GB × 1000000000 ÷ 1000000
Worked examples
10 GB ≈ 10000 MB
Step 1: (10 × 1000000000) ≈ 10000000000 B.
Step 2: 10000000000 ÷ 1000000 ≈ 10000 MB.20 GB ≈ 20000 MB
Step 1: (20 × 1000000000) ≈ 20000000000 B.
Step 2: 20000000000 ÷ 1000000 ≈ 20000 MB.
Results are rounded to 12 significant digits. Converting units does not increase the precision of the original measurement. Very large or small values outside JavaScript’s finite numeric range are rejected.
About Gigabytes
Gigabytes (GB) measures data storage under the conventions above. The base value in B is (x × 1000000000), where x is the numerical value in GB. Factors shown here are rounded for display; calculations use the stored factor.
About Megabytes
Megabytes (MB) measures data storage under the conventions above. The base value in B is (x × 1000000), where x is the numerical value in MB. Factors shown here are rounded for display; calculations use the stored factor.
Definitions and sources
For a different quantity or formatting task, see the related other conversion tools.
Gigabytes to megabytes reference table
| Gigabytes (GB) | Megabytes (MB) |
|---|---|
| 1 | 1000 |
| 5 | 5000 |
| 10 | 10000 |
| 25 | 25000 |
| 50 | 50000 |
| 100 | 100000 |
| 1000 | 1000000 |
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