Convert gigabytes to megabytes
Gigabyte (GB) to megabyte (MB). One gigabyte equals 1000 megabytes.
Formula
Gigabyte to megabyte conversion table
| Gigabytes | Megabytes | Megabytes | Gigabytes |
|---|---|---|---|
| 1 GB | 1000 MB | 1 MB | 0.001 GB |
| 2 GB | 2000 MB | 2 MB | 0.002 GB |
| 3 GB | 3000 MB | 3 MB | 0.003 GB |
| 5 GB | 5000 MB | 5 MB | 0.005 GB |
| 10 GB | 10000 MB | 10 MB | 0.01 GB |
| 20 GB | 20000 MB | 20 MB | 0.02 GB |
| 50 GB | 50000 MB | 50 MB | 0.05 GB |
| 100 GB | 100000 MB | 100 MB | 0.1 GB |
| 500 GB | 500000 MB | 500 MB | 0.5 GB |
| 1000 GB | 1000000 MB | 1000 MB | 1 GB |
Decimal gigabytes to megabytes conversion table
The exact decimal amounts people look up most often, worked out with the same factor the converter above uses. Every row is calculated, not rounded off a chart.
| Gigabytes | Megabytes |
|---|---|
| 0.1 GB | 100 MB |
| 0.15 GB | 150 MB |
| 0.2 GB | 200 MB |
| 0.25 GB | 250 MB |
| 0.3 GB | 300 MB |
| 0.33 GB | 330 MB |
| 0.35 GB | 350 MB |
| 0.4 GB | 400 MB |
| 0.45 GB | 450 MB |
| 0.5 GB | 500 MB |
| 0.55 GB | 550 MB |
| 0.6 GB | 600 MB |
| 0.65 GB | 650 MB |
| 0.67 GB | 670 MB |
| 0.7 GB | 700 MB |
| 0.75 GB | 750 MB |
| 0.8 GB | 800 MB |
| 0.85 GB | 850 MB |
| 0.9 GB | 900 MB |
| 0.95 GB | 950 MB |
| 1 GB | 1000 MB |
| 1.05 GB | 1050 MB |
| 1.1 GB | 1100 MB |
| 1.15 GB | 1150 MB |
| 1.2 GB | 1200 MB |
| 1.25 GB | 1250 MB |
| 1.3 GB | 1300 MB |
| 1.35 GB | 1350 MB |
| 1.4 GB | 1400 MB |
| 1.45 GB | 1450 MB |
| 1.5 GB | 1500 MB |
| 1.55 GB | 1550 MB |
| 1.6 GB | 1600 MB |
| 1.65 GB | 1650 MB |
| 1.7 GB | 1700 MB |
| 1.75 GB | 1750 MB |
| 1.8 GB | 1800 MB |
| 1.85 GB | 1850 MB |
| 1.9 GB | 1900 MB |
| 1.95 GB | 1950 MB |
| 2 GB | 2000 MB |
Megabytes back to gigabytes
The same conversion in reverse, for when you have the answer and need the question.
| Megabytes | Gigabytes |
|---|---|
| 1 MB | 0.001 GB |
| 10 MB | 0.01 GB |
| 50 MB | 0.05 GB |
| 100 MB | 0.1 GB |
| 250 MB | 0.25 GB |
| 500 MB | 0.5 GB |
| 512 MB | 0.512 GB |
| 750 MB | 0.75 GB |
| 1000 MB | 1 GB |
| 1024 MB | 1.024 GB |
| 2000 MB | 2 GB |
Where the gigabyte to megabyte factor comes from
- UnitGlide uses the decimal (SI) definition, the one drive manufacturers and network operators use: the prefix giga means 10⁹ and mega means 10⁶.
- One gigabyte is therefore 1 000 000 000 bytes and one megabyte is 1 000 000 bytes.
- Dividing the two gives 1 GB = 1000 MB exactly. megabytes = gigabytes × 1000, so 0.1 GB is 100 MB and 0.5 GB is 500 MB.
- The binary alternative is a different unit with a different name: 1 gibibyte (GiB) is 2³⁰ = 1 073 741 824 bytes, which is 1024 mebibytes (MiB).
Sources
Common mistakes
1000 or 1024, and why your drive looks smaller
A 1 TB drive is sold as 1 000 000 000 000 bytes (decimal), but Windows divides by 1024 three times and reports 931, while still printing the label GB. Nothing is missing and nobody is cheating: the two systems just use different bases. macOS and Linux report decimal GB, matching the box. IEC 80000-13 gives the binary sizes their own names (KiB, MiB, GiB) precisely to end this confusion.
Megabytes and megabits are not the same
A byte is 8 bits, so MB and Mb differ by a factor of 8. Internet speeds are sold in megabits per second (Mbps) while downloads are shown in megabytes per second (MB/s). A 100 Mbps line tops out around 12.5 MB/s, which is why a connection can look ten times slower than advertised when it is working perfectly.
To convert gigabytes to megabytes, multiply the number of gigabytes by 1000. One gigabyte equals 1000 megabytes, and one megabyte equals 0.001 gigabytes, so the relationship is fixed and exact. As a worked example, 10 GB comes to 10000 MB. Enter your own figure in the converter above to get an instant answer, or use the swap button to flip the direction. This is a digital storage conversion, and like every tool on UnitGlide it runs locally in your browser with no account or upload required. The table further down shows a range of common gigabyte values already worked out in megabytes, plus the reverse megabyte to gigabyte direction, which is handy for quick reference or double-checking a result by hand.
Gigabyte to megabyte in practice
Gigabytes to megabytes is a conversion people run against data caps, download sizes and cloud quotas, where the only real question is whether the counting is decimal or binary.
Everyday uses
Mobile data plans, video export sizes and backup estimates all sit in this range. A 4 GB film is 4,000 MB on the decimal scale that carriers and storefronts use, a 25 MB email limit is 0.025 GB, and a 1.5 GB game update is 1,500 MB. Knowing the two lets you work out how many photos, songs or minutes of video a given allowance will hold.
Rounding and the decimal choice
UnitGlide multiplies by a clean 1,000, so no rounding is needed: 1.5 GB is exactly 1,500 MB and 0.1 GB is 100 MB. The only wrinkle is which system your software uses. Phone storage and carrier meters are decimal, matching this page, while a few desktop tools still divide by 1,024 and print the smaller-looking result under the same GB label.
Why a new drive looks short
A drive sold as 1,000 GB can show up as about 931 GB in an operating system that counts in binary, because it divides by 1,024 three times while still writing GB. Nothing is missing; the box uses decimal gigabytes and the system uses binary gibibytes under the same name. That gap is the same one that separates a decimal GB from a binary GiB.
Megabytes, not megabits
Storage is measured in bytes, but internet speed is sold in bits, and the two differ by a factor of eight. A 1 GB download over a 100 Mbps line is not eight seconds; at roughly 12.5 megabytes per second it is closer to eighty. Keep the file size in MB and the line speed in Mb apart, or the estimate will be an order of magnitude out.
Planning around a data cap
Because streaming quality is quoted in megabits per second but allowances in gigabytes, this conversion is what tells you how long a plan lasts. Standard-definition video runs around 700 MB an hour and high-definition several times that, so a 10 GB cap is roughly fourteen hours of SD or a few of HD. Turning the GB allowance into MB per hour is how you avoid a mid-month cut-off.
Frequently asked questions
How many MB is 0.1 GB?
0.1 GB is 100 MB using the decimal (SI) definition, where 1 GB is 1000 MB. If your software counts in binary, 0.1 GiB is 102.4 MiB instead.
Is 1 GB 1000 MB or 1024 MB?
1 GB is 1000 MB. The 1024 figure belongs to the gibibyte (GiB), a separate binary unit of 2³⁰ bytes that many operating systems still label GB. Storage and bandwidth are sold in decimal GB, which is what this page uses.
How many MB is 0.5 GB?
0.5 GB is 500 MB. Half of 1000 MB, since the decimal factor is a clean 1000.
How many megabytes are in a gigabyte?
One gigabyte equals 1000 megabytes. The ratio is constant, so you can multiply any number of gigabytes by 1000 to get megabytes.
What is the formula to convert gigabytes to megabytes?
Use megabytes = gigabytes × 1000. UnitGlide applies this exact formula for every value, so results stay accurate across the whole range.
How do I convert megabytes back to gigabytes?
Go the other way by using one megabyte equals 0.001 gigabytes. You can also press the swap button in the converter above to flip the direction in one click.
Is this gigabyte to megabyte converter accurate?
Yes. It uses internationally defined SI conversion factors, as maintained by the BIPM, and all math runs in your browser so nothing is rounded away on a server. For everyday use the displayed precision is more than enough.