MB to GB Converter
Convert megabytes to gigabytes and back. 1 megabyte = 0.001 gigabytes exactly.
Tip: Results show up to 8 significant digits. The factors and their sources are listed on the "Where our numbers come from" page.
On this page
MB and GB
One megabyte is exactly 0.001 gigabytes, and one gigabyte is exactly 1,000 megabytes. The converter works both ways: use the two tabs at the top of the tool to choose the direction.
Quick conversion table
MB to GB
| MB | GB |
|---|---|
| 1 MB | 0.001 GB |
| 10 MB | 0.01 GB |
| 100 MB | 0.1 GB |
| 250 MB | 0.25 GB |
| 500 MB | 0.5 GB |
| 512 MB | 0.512 GB |
| 1,000 MB | 1 GB |
| 1,024 MB | 1.024 GB |
| 2,000 MB | 2 GB |
| 5,000 MB | 5 GB |
| 10,000 MB | 10 GB |
| 100,000 MB | 100 GB |
GB to MB
| GB | MB |
|---|---|
| 0.5 GB | 500 MB |
| 1 GB | 1,000 MB |
| 2 GB | 2,000 MB |
| 4 GB | 4,000 MB |
| 8 GB | 8,000 MB |
| 16 GB | 16,000 MB |
| 32 GB | 32,000 MB |
| 64 GB | 64,000 MB |
| 128 GB | 128,000 MB |
| 256 GB | 256,000 MB |
| 512 GB | 512,000 MB |
| 1,000 GB | 1,000,000 MB |
Exact factor and source
| Conversion | Value | Basis |
|---|---|---|
| 1 megabyte in gigabytes | 0.001 | exact. SI Brochure, 9th edition (BIPM 2019): SI prefix mega = 10^6; 1 MB = 10^6 B |
| 1 gigabyte in megabytes | 1,000 | exact. SI Brochure, 9th edition (BIPM 2019): SI prefix giga = 10^9; 1 GB = 10^9 B |
How to convert megabytes to gigabytes
- Step oneTake the number of megabytes.
- Step twoMultiply it by 0.001.
- Step threeThe result is the number of gigabytes.
- Step fourTo go back, divide by 0.001, or multiply by 1,000.
Example: 2,500 MB x 0.001 = 2.5 GB.
All data size units compared
Each unit written in bytes, the base unit of this tool. Exact values come straight from the definitions.
| Unit | Symbol | Value in bytes |
|---|---|---|
| Bytes | B | 1 byte |
| Kilobytes | kB | 1,000 bytes |
| Megabytes | MB | 1,000,000 bytes |
| Gigabytes | GB | 1,000,000,000 bytes |
| Terabytes | TB | 1,000,000,000,000 bytes |
| Kibibytes | KiB | 1,024 bytes |
| Mebibytes | MiB | 1,048,576 bytes |
| Gibibytes | GiB | 1,073,741,824 bytes |
| Tebibytes | TiB | 1,099,511,627,780 bytes |
What is a megabyte?
A megabyte (MB) is 1,000,000 bytes in the decimal SI system used by storage makers and mobile data plans. Some systems count in powers of 1,024 and keep the label MB; the binary unit is the mebibyte (MiB), 1.048576 MB.
What is a gigabyte?
A gigabyte (GB) is 1,000 megabytes, or 1,000,000,000 bytes, in the decimal SI system. The binary gibibyte (GiB) is 1.073741824 GB, which is why a drive sold in GB can show a smaller number in software that counts in GiB.
What this converter does not do
- Results are rounded for display to 8 significant digits; the stored factor is the exact one.
- Decimal units (kB, MB, GB) and binary units (KiB, MiB, GiB) are different sizes, and the tool does not guess which one a program means.
- It converts sizes only; it does not estimate download times or compression.
Frequently asked questions
How many gigabytes are in a megabyte?
1 megabyte is exactly 0.001 gigabytes. That factor is exact by definition.
How many megabytes are in a gigabyte?
1 gigabyte is exactly 1,000 megabytes.
How many MB are in 2 GB?
2 GB is 2,000 MB in the decimal (SI) system.
Where do the factors come from?
Megabytes: SI Brochure, 9th edition (BIPM 2019): SI prefix mega = 10^6; 1 MB = 10^6 B. Gigabytes: SI Brochure, 9th edition (BIPM 2019): SI prefix giga = 10^9; 1 GB = 10^9 B.
References
- MB: SI Brochure, 9th edition (BIPM 2019): SI prefix mega = 10^6; 1 MB = 10^6 B
- GB: SI Brochure, 9th edition (BIPM 2019): SI prefix giga = 10^9; 1 GB = 10^9 B
- NIST Special Publication 811: Guide for the Use of the International System of Units (SI), 2008 edition.
- The International System of Units (SI Brochure), 9th edition, BIPM.