Gigabytes to Megabytes Converter
Convert gigabytes to megabytes — and back — in an instant. Type a value in either box and the answer updates live. It’s accurate, free and completely private: the conversion runs entirely on your device.
- 🔒 100% private — no uploads
- 🆓 Free, no watermark
- 📱 Works on any device
How to convert
- 1
Choose your units
The tool opens on the most common pairing. Change either unit from its dropdown, or hit the swap button to flip the direction.
- 2
Type a value
Enter a number in either box. The other side updates instantly as you type — convert either way without pressing a button.
- 3
Copy or compare
Copy the result to your clipboard, or scan the common-values table below for quick at-a-glance conversions.
Why use Gigabytes to Megabytes Converter?
100% private
Every conversion is computed locally in your browser. Nothing you enter ever leaves your device.
Instant & two-way
Results update live as you type, in either direction — no “convert” button and no page reloads.
Accurate
Conversions use exact, standards-based factors, so you get the same answer a trusted reference would.
Works on any device
No install and no account — it runs in any modern browser on desktop, tablet or phone.
Gigabytes to megabytes: decimal vs binary
In decimal units — used by drive makers, ISPs and this tool — 1 GB = 1000 MB, so 2.5 GB = 2500 MB. Operating systems often report binary units instead, where 1 GiB = 1024 MiB. The two systems drift apart as sizes grow, which is why the same file can show different “sizes” in different places.
Sizing downloads and storage
A 4.7 GB DVD holds 4700 MB, a two-hour HD movie streams around 3–4 GB, and a 256 GB phone has 256,000 decimal MB (about 238 GiB as the OS counts it). For data plans, remember both directions count: a 1 GB plan is 1000 MB of combined up- and downloads.
Frequently asked questions
How do I convert gigabytes to megabytes?
Type the number of gigabytes in the first box and read the result in megabytes — it updates as you type. To go the other way, type in the megabytes box instead.
Does anything get uploaded to a server?
No. The conversion runs entirely in your browser with JavaScript — nothing you type is uploaded, stored or logged, and it keeps working offline once the page has loaded.
Is it free?
Yes — completely free, no account, no watermark and no limits.