Convert Gigabytes to Megabytes
One gigabyte equals 1,024 megabytes. Type any value to convert gigabytes to megabytes instantly — with a full reference table below.
Convert Gigabytes to Megabytes
Converted in your browser — nothing you enter is sent anywhere.
How to convert Gigabytes to Megabytes
To convert gigabytes to megabytes, multiply by 1,024. One gigabyte equals 1,024 MB, and one megabyte equals 0.000976562 GB.
- Take the value in gigabytes — for example 3 GB.
- Multiply by 1,024 (the number of megabytes in one gigabyte).
- 3 × 1,024 = 3,072 MB.
Quick mental estimate: Multiply the number of gigabytes by 1,024 — that is exact.
Gigabytes to Megabytes conversion table
| Gigabytes | Megabytes |
|---|---|
| 1 GB | 1,024 MB |
| 2 GB | 2,048 MB |
| 4 GB | 4,096 MB |
| 5 GB | 5,120 MB |
| 8 GB | 8,192 MB |
| 10 GB | 10,240 MB |
| 16 GB | 16,384 MB |
| 20 GB | 20,480 MB |
| 32 GB | 32,768 MB |
| 50 GB | 51,200 MB |
| 64 GB | 65,536 MB |
| 100 GB | 102,400 MB |
| 128 GB | 131,072 MB |
| 256 GB | 262,144 MB |
| 512 GB | 524,288 MB |
| 1,024 GB | 1,048,576 MB |
| Megabytes | Gigabytes |
|---|---|
| 1 MB | 0.000976562 GB |
| 2 MB | 0.00195312 GB |
| 4 MB | 0.00390625 GB |
| 5 MB | 0.00488281 GB |
| 8 MB | 0.0078125 GB |
| 10 MB | 0.00976562 GB |
| 16 MB | 0.015625 GB |
| 20 MB | 0.0195312 GB |
| 32 MB | 0.03125 GB |
| 50 MB | 0.0488281 GB |
| 64 MB | 0.0625 GB |
| 100 MB | 0.0976562 GB |
| 128 MB | 0.125 GB |
| 256 MB | 0.25 GB |
| 512 MB | 0.5 GB |
| 1,024 MB | 1 GB |
About converting Gigabytes to Megabytes
Gigabytes (GB) and Megabytes (MB) are both units of data storage. The exact factor is 1 GB = 1,024 MB, so multiply by 1,024 to go from gigabytes to megabytes (or divide to go back).
The conversion runs entirely in your browser. Need the reverse? Use the Megabytes to Gigabytes converter, or the full unit converter for every unit at once.
Binary vs decimal: why your drive looks smaller
Windows and RAM reports count in powers of 1,024 (binary, sometimes written KiB/MiB/GiB); drive makers, macOS and mobile carriers count in powers of 1,000 (decimal). Same bytes, two answers:
| Gigabytes | Megabytes (binary · Windows) | Megabytes (decimal · on the box) |
|---|---|---|
| 1 GB | 1,024 MB | 1,000 MB |
| 2 GB | 2,048 MB | 2,000 MB |
| 4 GB | 4,096 MB | 4,000 MB |
| 5 GB | 5,120 MB | 5,000 MB |
| 8 GB | 8,192 MB | 8,000 MB |
| 10 GB | 10,240 MB | 10,000 MB |
| 16 GB | 16,384 MB | 16,000 MB |
| 20 GB | 20,480 MB | 20,000 MB |
| 32 GB | 32,768 MB | 32,000 MB |
| 50 GB | 51,200 MB | 50,000 MB |
Example: a “1 TB” drive holds 10¹² bytes, which Windows shows as about 931 GB.
Real-world data storage in gigabytes and megabytes
| Example | Gigabytes | Megabytes |
|---|---|---|
| A CD | 0.683594 GB | 700 MB |
| A single-layer DVD (4.7 GB) | 4.377216 GB | 4,482.269 MB |
| A 50 GB dual-layer Blu-ray | 46.56613 GB | 47,683.72 MB |
“≈” marks typical values; the rest are defined or measured figures.
The units
Here, 1,024 MB = 1,073,741,824 bytes (GiB). Decimal gigabyte = 1,000,000,000 bytes.
Used for: Phone storage, mobile data, RAM.
Here, 1,024 KB = 1,048,576 bytes (MiB). Decimal megabyte = 1,000,000 bytes.
Used for: Photos, songs, app downloads.
This page uses binary units (1 KB = 1,024 bytes), which is how Windows and most RAM reports count. Storage makers and macOS use decimal units (1 kB = 1,000 bytes), so both are shown below.