GB digital storage unit.
GB to MB Converter — GB to MB
Convert GB (GB) to MB (MB) using the exact conversion factor (1 gb = 1,000 mb). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
GB to MB converter
Converter
Digital Storage Converter
Convert bits, bytes, decimal storage, binary storage, nibbles, and word sizes.
Context values
Some unit families need one extra value for a physically accurate result.
MB digital storage unit.
Result = input x 8e+9 / 8e+6.
Digital storage uses bits as the base unit.
Reserved above the conversion cards and below the converter.
About Converting GB to MB
GB and MB are everyday digital-storage units, used for everything from file sizes and app downloads to storage device capacity and mobile data allowances. GB is typically associated with used worldwide as a standard digital storage unit, while MB is typically associated with used worldwide as a standard digital storage and file-size unit.
Formula
mb = gb × 1000
This factor comes from each unit's defined relationship to the category's base unit: 1 gb equals 8000000000 base units, and 1 mb equals 8000000 base units, so dividing one by the other gives the direct gb-to-mb factor of 1000.
Simple example
1 GB × 1000 = 1,000 MB
1 gb = 1,000 mb.
Real-world example
500 GB × 1000 = 500,000 MB
500 gb = 500,000 mb.
Conversion table
| GB (GB) | MB (MB) |
|---|---|
| 1 GB | 1,000 MB |
| 8 GB | 8,000 MB |
| 16 GB | 16,000 MB |
| 64 GB | 64,000 MB |
| 256 GB | 256,000 MB |
| 1,000 GB | 1,000,000 MB |
Reverse conversion: MB to GB
1 MB × 0.001 = 0.001 GB
1 mb = 0.001 gb.
gb = mb × 0.001
GB vs. MB
| Aspect | GB | MB |
|---|---|---|
| Family | Decimal (SI-prefixed) digital storage unit | Decimal (SI-prefixed) digital storage unit |
| Typical use | Storage device and SSD/HDD capacity labeling | File and document size reporting |
| Where it's used | Used worldwide as a standard digital storage unit | Used worldwide as a standard digital storage and file-size unit |
Understanding the GB
GB (GB) measures digital storage. In the decimal convention, 1 gigabyte equals 1,000 megabytes (10⁹ bytes). It is classified as a Decimal (SI-prefixed) digital storage unit.
Where it's used: Used worldwide as a standard digital storage unit
Uses of the GB today
- Storage device and SSD/HDD capacity labeling
- Mobile data plan allowances
- Software and media file size reporting
History of the GB
Like the megabyte, the gigabyte inherited ambiguity between decimal (10⁹) and binary (2³⁰) interpretations from early computing conventions, resolved formally by the 1998 IEC binary-prefix standard, which reserves 'gigabyte' for the decimal meaning and 'gibibyte' (GiB) for the binary one.
Historical origin. GB was not the invention of a single named person; it developed through the process described above.
Understanding the MB
MB (MB) measures digital storage. In the decimal convention used by storage manufacturers and most software, 1 megabyte equals 1,000 kilobytes (10⁶ bytes). It is classified as a Decimal (SI-prefixed) digital storage unit.
Where it's used: Used worldwide as a standard digital storage and file-size unit
Decimal MB vs. binary MiB. Storage manufacturers typically use decimal megabytes (10⁶ bytes), while some operating systems report binary mebibytes (2²⁰ bytes) but label them 'MB' — this is the common reason a drive's reported capacity looks smaller than advertised.
Uses of the MB today
- File and document size reporting
- Storage device capacity labeling
- Network transfer size measurement
History of the MB
Byte-based storage units grew out of early computing, where memory was naturally organized in powers of two, leading to the common but technically non-standard practice of using 'megabyte' to mean 2²⁰ bytes (1,048,576) in some software contexts.
In 1998, the International Electrotechnical Commission (IEC) introduced binary prefixes — kibi-, mebi-, gibi- — specifically so 'megabyte' could be reserved for the decimal (10⁶) meaning and 'mebibyte' (MiB) used for the binary (2²⁰) meaning, resolving the ambiguity, though usage still varies by industry.
Historical origin. MB was not the invention of a single named person; it developed through the process described above.
GB — sources
- IEC 80000-13 — International standard defining binary prefixes distinct from decimal SI prefixes.
MB — sources
- IEC 80000-13 — International standard defining binary prefixes (kibi-, mebi-, gibi-) distinct from decimal SI prefixes.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many mb are in 1 gb?
1 gb equals 1,000 mb, using the exact defined conversion factor rather than an estimate.
How do I convert gb to mb?
Multiply the gb value by 1000. The converter above does this instantly to whatever precision you set.
How do I convert mb back to gb?
Use the reverse factor: 1 mb equals 0.001 gb. You can also use the swap control in the converter above to flip the direction instantly.
What is a gb?
GB (GB) measures digital storage. In the decimal convention, 1 gigabyte equals 1,000 megabytes (10⁹ bytes). It is classified as a Decimal (SI-prefixed) digital storage unit.
What is a mb?
MB (MB) measures digital storage. In the decimal convention used by storage manufacturers and most software, 1 megabyte equals 1,000 kilobytes (10⁶ bytes). It is classified as a Decimal (SI-prefixed) digital storage unit.
Is the gb to mb conversion exact?
Yes. Both gb and mb are defined by fixed standards rather than physical artifacts, so the factor of 1000 used above is exact to as many digits as you choose to display.
What is the difference between decimal mb vs. binary mib?
Storage manufacturers typically use decimal megabytes (10⁶ bytes), while some operating systems report binary mebibytes (2²⁰ bytes) but label them 'MB' — this is the common reason a drive's reported capacity looks smaller than advertised.
Where is the gb still used today?
Used worldwide as a standard digital storage unit