How to convert gigabytes to megabytes
One gigabyte equals 1,000 megabytes, so multiply the number of gigabytes by 1,000:
MB = GB × 1,000
GB = MB ÷ 1,000 (1 MB = 0.001 GB)
Example: 4.7 GB → 4.7 × 1,000 = 4,700 MB.
Going the other way, divide by 1,000, or multiply by 0.001; the megabytes to gigabytes converter does it for you.
Everyday values
| Gigabytes | Megabytes | For example |
|---|---|---|
| 1 GB | 1,000 MB | one gigabyte |
| 4.7 GB | 4,700 MB | a DVD |
| 10 GB | 10,000 MB | a mobile data plan |
| 50 GB | 50,000 MB | a large game |
When you need this conversion
Multiply gigabytes by 1,000 to get megabytes (decimal units). Mobile data plans and cloud storage are sold this way.
Gigabyte to megabyte conversion table
| GB | MB | GB | MB |
|---|---|---|---|
| 0.5 GB | 500 MB | 5.5 GB | 5,500 MB |
| 1 GB | 1,000 MB | 6 GB | 6,000 MB |
| 1.5 GB | 1,500 MB | 6.5 GB | 6,500 MB |
| 2 GB | 2,000 MB | 7 GB | 7,000 MB |
| 2.5 GB | 2,500 MB | 7.5 GB | 7,500 MB |
| 3 GB | 3,000 MB | 8 GB | 8,000 MB |
| 3.5 GB | 3,500 MB | 8.5 GB | 8,500 MB |
| 4 GB | 4,000 MB | 9 GB | 9,000 MB |
| 4.5 GB | 4,500 MB | 9.5 GB | 9,500 MB |
| 5 GB | 5,000 MB | 10 GB | 10,000 MB |
About the units
- Gigabyte (GB): 1,000,000,000 bytes (SI prefix).
- Megabyte (MB): 1,000,000 bytes (SI prefix).
Both are units of digital storage. The conversion factor comes from the exact definitions above, so the calculator is exact; results are only rounded for display (up to six significant digits).
Frequently asked questions
How many megabytes are in one gigabyte?
One gigabyte is 1,000 megabytes. One megabyte is 0.001 gigabytes.
How do I convert gigabytes to megabytes?
Multiply the value in gigabytes by 1,000. To go back, divide by 1,000.
What is 4.7 GB in megabytes?
4.7 GB = 4,700 MB.
What is 10 GB in megabytes?
10 GB = 10,000 MB.
Sources
- NIST Special Publication 811 (2008), Guide for the Use of the International System of Units (SI), Appendix B: conversion factors.
- NIST Handbook 44 (2024), Appendix C: General tables of units of measurement.
Last reviewed 5 October 2026. Results are estimates; see our disclaimer.