Gigabytes to Megabytes
One gigabyte equals 1000 megabytes.
Megabytes = gigabytes × 1000
Digital Storage Conversion
Common File Sizes
Digital Storage Reference Guide
Binary vs Decimal Systems
Binary (1024-based): Used by operating systems
1 KiB = 1,024 bytes
1 MiB = 1,024 KiB = 1,048,576 bytes
1 GiB = 1,024 MiB = 1,073,741,824 bytes
Decimal (1000-based): Used by storage manufacturers
1 KB = 1,000 bytes
1 MB = 1,000 KB = 1,000,000 bytes
1 GB = 1,000 MB = 1,000,000,000 bytes
Storage Device Capacities
Floppy Disk: 1.44 MB
CD: 700 MB
DVD: 4.7 GB (single layer)
Blu-ray: 25 GB (single layer)
USB Flash: 8 GB - 1 TB
SSD: 120 GB - 8 TB
HDD: 500 GB - 20 TB
Enterprise: Up to 100 TB+
Data Transfer & Internet
Email attachment limit: ~25 MB
Streaming (HD): ~3 GB/hour
Streaming (4K): ~7 GB/hour
Web page: ~2 MB average
Mobile app: 10-200 MB
PC game: 20-150 GB
Important Notes
• 1 byte = 8 bits (fundamental relationship)
• Storage manufacturers use decimal, OS shows binary (explains "missing" space)
• Network speeds typically measured in bits per second (bps)
• File compression can significantly reduce storage requirements
Gigabytes to Megabytes Conversion Table
| GB | MB |
|---|---|
| 0.1 | 100 |
| 0.25 | 250 |
| 0.5 | 500 |
| 1 | 1000 |
| 2 | 2000 |
| 4 | 4000 |
| 8 | 8000 |
| 16 | 16000 |
| 32 | 32000 |
| 64 | 64000 |
| 128 | 128000 |
| 256 | 256000 |
| 500 | 500000 |
| 1000 | 1000000 |
| 2000 | 2000000 |
About This Conversion
Gigabytes to megabytes multiplies by 1,000 in decimal units. The conversion comes up when an allowance is quoted in gigabytes but the things consuming it are measured in megabytes: a 2 GB monthly data plan is 2,000 MB, enough for about four hundred 5 MB photos.
Upload and attachment limits sit in this range too. A 25 MB email limit is 0.025 GB, so a 1 GB video is forty times too large to attach and has to go through a link instead.
Frequently Asked Questions
How many MB is 1 GB?
1 GB is 1,000 MB in decimal units, or 1,024 MiB in binary units.
How many MB is 2 GB?
2 GB is 2,000 MB.
How many MB is 0.5 GB?
0.5 GB is 500 MB.
How many photos fit in 1 GB?
At about 5 MB per photo, roughly 200 photos fit in 1 GB.
Worth Knowing
MB vs MiB
A megabyte is 1,000,000 bytes while a mebibyte is 1,048,576 bytes, and the gap grows with each prefix until a 1 TB drive reports as 931 GB.
Related Conversions
Converting the other way? Megabytes to Gigabytes
Need a different unit? Open the full digital storage converter