MB to GB Converter
Convert MB to GB for file sizes, video downloads, mobile data plans and cloud storage limits. 1000 MB = 1 GB (decimal) or 1024 MB = 1 GiB (binary) — both shown.
Last updated: May 2026
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How to convert megabytes to gigabytes
Storage planning, downloads, backups and upload limits often switch between megabytes and gigabytes. A clean conversion helps you judge whether a file fits in an email quota, cloud plan or device capacity without doing the math by hand. On this page, 1 MB becomes 0.001 GB.
The formula is gigabytes = megabytes ÷ 1000. The more important point is to keep an eye on the unit convention. This page uses decimal storage units. Some operating systems or technical tools may show binary units instead, which changes the displayed number slightly.
Typical use cases
- Checking whether files fit within cloud, email or upload limits
- Planning storage for backups, media and archives
- Understanding how many large files can fit on a drive or card
A practical example is moving videos or ROM sets to portable storage. Megabytes feel small in isolation, but converting them to gigabytes makes capacity planning easier to judge at a glance.
Quick reference
| MB | GB |
|---|---|
| 100 | 0.1 |
| 1 | 0.001 |
| 500 | 0.5 |
| 1000 | 1 |
| 5000 | 5 |
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Frequently Asked Questions
Why does the same file size vary between download descriptions and my disk?
Download pages and cloud services list file size in decimal MB (dividing by 1000), which is the marketing standard. Your operating system often shows binary units (dividing by 1024), which are slightly smaller. A 1 GB file in download description is actually 1000 MB, but your OS might show it as ~954 MiB. Knowing this difference prevents confusion when checking whether you have enough space.
When is the MB-to-GB conversion most useful?
When checking email attachment limits, cloud storage quotas, or upload size restrictions—all of which are stated in MB or GB. A bulk email export might be listed as "850 MB" but your Gmail limit is "25 MB per message," so you immediately know you need to split it. Converting megabytes to gigabytes helps you visualize large datasets and plan transfers without doing arithmetic under pressure.
Does this page's calculation match what my device shows?
This page uses decimal conversion (÷1000), which matches how files are advertised and how cloud services bill storage. Your phone or computer may show binary units (÷1024) for available space, which always appears as slightly smaller numbers. Always check your device's unit convention; the difference compounds on large drives and becomes significant at the TB scale.
Why do cloud providers claim more storage than my device actually has available?
Cloud services advertise storage in decimal units (1 GB = 1000 MB), but operating systems often display binary units (1 GiB = 1024 MiB). A 100 GB cloud plan in decimal is actually 93.1 GiB in binary terms. This is why your device always shows less free space than purchased—it's not a trick, just unit conversion. Our page clarifies both so you understand the discrepancy.
How do I calculate if a file fits in my storage quota?
Use this MB to GB converter, then compare the result to your available storage. For example, if you have a 850 MB video and your email allows 25 MB per attachment, divide 850 by 25 = you need 34 emails. If your cloud plan shows "100 GB remaining" and you have a 4.5 GB backup file, you'll have 95.5 GB left—plenty of space. Always check both the converted size and your remaining capacity before transferring.