Gigabytes to Megabytes
1 gigabyte = 1,000 megabytes · 1 MB = 0.001 GB
1 gigabyte = 1,000 megabytes
How it’s calculated
MB = GB × 1000
- Multiply the value in gigabytes by 1000.
- To go back, divide by 1000 (or multiply by 0.001).
- 1 GB = 1,000 MB · 1 MB = 0.001 GB
Show worked solutionFactor, unit cancellation and rounding, step by step
Find the conversion factor
By definition 1 GB = 8000000000 bit and 1 MB = 8000000 bit, so 1 GB = 1000 MB. Source: IEC 80000-13 (decimal and binary prefixes).
Multiply by the factor written as a fraction
Put GB in the denominator so it cancels, leaving MB.
Calculate (unrounded)
Round the answer
Rounded to 5 significant figures.
Answer: 1000 MB
1 GB in other units
Batch convert GB → MB
- 1 GB = 1000 MB
- 5 GB = 5000 MB
- 10 GB = 10000 MB
- 25 GB = 25000 MB
Quick examples
- 1 gigabyte = 1,000 megabytes
- 5 gigabytes = 5,000 megabytes
- 10 gigabytes = 10,000 megabytes
- 25 gigabytes = 25,000 megabytes
- 100 gigabytes = 100,000 megabytes
About these units
Gigabyte (GB)
SI (metric)
Decimal gigabyte: exactly 10⁹ bytes. Drive makers use this; Windows reports GiB but labels them "GB".
1 GB = 8000000000 bit
Source: IEC 80000-13 (decimal and binary prefixes)
Megabyte (MB)
SI (metric)
Decimal megabyte: exactly 1 000 000 bytes.
1 MB = 8000000 bit
Source: IEC 80000-13 (decimal and binary prefixes)
Gigabytes to megabytes conversion table
| Gigabytes (GB) | Megabytes (MB) |
|---|---|
| 0.1 GB | 100 MB |
| 0.5 GB | 500 MB |
| 1 GB | 1,000 MB |
| 2 GB | 2,000 MB |
| 3 GB | 3,000 MB |
| 4 GB | 4,000 MB |
| 5 GB | 5,000 MB |
| 6 GB | 6,000 MB |
| 7 GB | 7,000 MB |
| 8 GB | 8,000 MB |
| 9 GB | 9,000 MB |
| 10 GB | 10,000 MB |
| 15 GB | 15,000 MB |
| 20 GB | 20,000 MB |
| 25 GB | 25,000 MB |
| 30 GB | 30,000 MB |
| 40 GB | 40,000 MB |
| 50 GB | 50,000 MB |
| 75 GB | 75,000 MB |
| 100 GB | 100,000 MB |
| 250 GB | 250,000 MB |
| 500 GB | 500,000 MB |
| 1,000 GB | 1,000,000 MB |
Related conversions
Frequently asked questions
How do I convert gigabytes to megabytes?
Use MB = GB × 1000. Multiply the value in gigabytes by 1000.
How many megabytes are in 1 gigabyte?
1 gigabyte (GB) equals 1,000 megabytes (MB).
How many gigabytes are in 1 megabyte?
1 megabyte (MB) equals 0.001 gigabytes (GB).
What is 10 GB in MB?
10 gigabytes = 10,000 megabytes.
What is a gigabyte?
Decimal gigabyte: exactly 10⁹ bytes. Drive makers use this; Windows reports GiB but labels them "GB".
What is a megabyte?
Decimal megabyte: exactly 1 000 000 bytes.
Formula: MB = GB × 1000. Factors last reviewed 2026-10-27.