Gigabytes to Megabytes Converter (GB to MB)
Convert gigabytes to megabytes instantly. 1 GB = 1,024 MB. Includes the formula, a full conversion table and a calculator that works offline.
The formula
To convert gigabytes to megabytes, multiply by 1,024:
MB = GB × 1,024Going the other way, divide instead — or multiply by 0.000977, which is the same thing:
GB = MB × 0.000977Gigabytes to Megabytes conversion table
| Gigabytes | Megabytes |
|---|---|
| 1 GB | 1,024 MB |
| 2 GB | 2,048 MB |
| 3 GB | 3,072 MB |
| 4 GB | 4,096 MB |
| 5 GB | 5,120 MB |
| 6 GB | 6,144 MB |
| 7 GB | 7,168 MB |
| 8 GB | 8,192 MB |
| 9 GB | 9,216 MB |
| 10 GB | 10,240 MB |
| 15 GB | 15,360 MB |
| 20 GB | 20,480 MB |
| 25 GB | 25,600 MB |
| 30 GB | 30,720 MB |
| 40 GB | 40,960 MB |
| 50 GB | 51,200 MB |
| 75 GB | 76,800 MB |
| 100 GB | 102,400 MB |
| 250 GB | 256,000 MB |
| 500 GB | 512,000 MB |
| 1000 GB | 1,024,000 MB |
Megabytes to Gigabytes
| Megabytes | Gigabytes |
|---|---|
| 1 MB | 0.000977 GB |
| 2 MB | 0.001953 GB |
| 3 MB | 0.00293 GB |
| 4 MB | 0.003906 GB |
| 5 MB | 0.004883 GB |
| 6 MB | 0.005859 GB |
| 7 MB | 0.006836 GB |
| 8 MB | 0.007812 GB |
| 9 MB | 0.008789 GB |
| 10 MB | 0.009766 GB |
What that actually looks like
A conversion factor is hard to judge on its own. These are quantities most people already have a feel for, converted for you:
- An HD film is about 4 GB — 4,096 MB
- A phone plan might include 20 GB — 20,480 MB
- A modern game install is 100 GB — 102,400 MB
Why both units are still in use
Digital storage has a genuine ambiguity: 1 GB can mean 1,024 MB (the binary sense your operating system uses) or 1,000 MB (the decimal sense drive manufacturers print on the box). This page uses the binary values, which is why a 1 TB drive shows up as roughly 931 GB once it is plugged in. Nothing is missing — the two sides are simply counting differently.
Mistakes worth avoiding
Do not mix bits and bytes. Broadband is sold in megabits per second and files are measured in megabytes, so a 100 Mb connection downloads at about 12.5 MB per second, not 100. The eight-to-one difference is why a download always looks slower than the advertised speed.
The other habit worth breaking is rounding too early. Convert first, round once at the end, and you avoid the drift that turns a small approximation into a visible error by the third calculation.
Doing it in your head
When you only need a rough answer, there is nothing to approximate — the factor is the whole number 1,024, so multiply and you have the exact answer. Ten gigabytes is 10,240 megabytes. An estimate is enough for deciding whether something will fit or whether a figure sounds plausible. When the number has to be right — because you are buying, cooking or building to it — use the calculator and let it carry the decimals.
Common questions
How many megabytes are in one gigabyte?
One gigabyte equals 1,024 megabytes. The calculator above handles any value, including decimals and very large numbers, and updates as you type.
Is this an exact conversion?
Yes — this is an exact defined ratio, not an approximation. The table rounds for readability; the calculator does not.
Does this work offline?
Yes. The conversion runs in your browser with no network request, so it works on a plane, in a basement, or on a phone with no signal once the page has loaded.