GB to MB●
Gigabytes in. Megabytes out. Convert data plans and files in a moment.
Digital storage
1 byte = 8 bits. Decimal: kB, MB, GB (×1,000). Binary: KiB, MiB, GiB (×1,024).
Definitions: NIST binary prefixes ↗Use a decimal point, for example 2.54. Scientific notation works too: 1e3.
Try a value
Pick an example to startThe formula
megabytes = gigabytes × 1000
Multiply the number of gigabytes by 1000 to get megabytes. To go the other way, divide by the same number.
A worked example
For 2 GB, multiply 2 by 1000. The result is approximately 2000 MB.
2 × 1000 ≈ 2000 MB
Quick reference
Reference values are rounded to 6 decimal places. Use the converter above for other values or precision.
| Gigabytes (GB) | Megabytes (MB) |
|---|---|
| 0.5 | 500 |
| 1 | 1,000 |
| 2 | 2,000 |
| 4 | 4,000 |
| 8 | 8,000 |
| 16 | 16,000 |
| 32 | 32,000 |
| 64 | 64,000 |
| 128 | 128,000 |
All equivalent units
The same value, in every supported unit.
Digital storage conversions
For data plans and downloads.
Use this conversion for mobile data plans, upload limits and storage. In decimal units, 1 GB is exactly 1000 MB. For binary units choose GiB and MiB.
Calculation details & precision
A byte is 8 bits. Decimal prefixes use powers of 1,000: 1 kB = 1,000 B and 1 GB = 1,000,000,000 B. Binary prefixes use powers of 1,024: 1 KiB = 1,024 B and 1 GiB = 1,073,741,824 B. Calculations use bytes as the base unit.
Automatic displays up to 12 significant digits. Choose 2, 4 or 6 decimal places in Precision for a shorter result. Displayed results are rounded; very large or small values use scientific notation.
Common questions
How many MB are in 1 GB?
1000 MB in decimal units, or 1024 MiB in binary units.
How many megabytes are in 4 gigabytes?
4 GB is approximately 4000 MB. The converter can show more significant digits or round to a chosen number of decimal places.