Megabytes to Gigabytes Converter (MB to GB)
1 MB = 0.001 GB in decimal (SI) units, the way storage makers count. Convert megabytes to gigabytes, with MB to GB and GB to MB charts.
Gigabyte (GB) = Megabyte (MB) × 0.001
Megabyte (MB): A megabyte (MB) is 1,000,000 bytes (10^6), or eight megabits. The binary amount 1,048,576 bytes is a mebibyte (MiB), not a decimal megabyte.
Gigabyte (GB): A gigabyte is 1,000,000,000 bytes (10^9). A capacity of 500 decimal GB is about 465.66 GiB; the differing numbers describe the same number of bytes.
| Megabyte (MB) | Gigabyte (GB) |
|---|---|
| 1 | 0.001 |
| 5 | 0.005 |
| 10 | 0.01 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
File sizes, app downloads and photos show up in megabytes, while drives, cloud plans and data allowances are sold in gigabytes. In the decimal system that storage makers and the SI use, a gigabyte is exactly 1,000 megabytes, so converting is a matter of moving the decimal point three places.
Windows File Explorer counts differently: it divides by 1,024 at each step but still writes MB and GB, which is why a file can look a few percent smaller there than on a Mac. Those binary units are properly called mebibytes (MiB) and gibibytes (GiB), and 1 GiB is 1,024 MiB.
How to use this tool
- Type a value in the Megabyte box to see it in gigabytes, or type in the Gigabyte box to convert the other way.
- Press ⇄ to swap the two units, or Load example for a typical value.
- Check the charts below for common values; for other units, open the Digital Storage converter.
Formula
Gigabyte (GB) = Megabyte (MB) × 0.001
Megabyte (MB) = Gigabyte (GB) × 1000
Both factors come from exact definitions: 1 gigabyte = 1000 megabytes and 1 megabyte = 0.001 gigabytes (shown to 12 significant digits).
Example
Two conversions worked with the same factors the converter uses:
4700 MB × 0.001 = 4.7 GB
2.5 GB × 1000 = 2500 MB
Megabyte to Gigabyte chart
Common values from megabytes to gigabytes, rounded to four decimal places.
| Megabyte (MB) | Gigabyte (GB) |
|---|---|
| 1 | 0.001 |
| 10 | 0.01 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 200 | 0.2 |
| 250 | 0.25 |
| 300 | 0.3 |
| 500 | 0.5 |
| 700 | 0.7 |
| 750 | 0.75 |
| 800 | 0.8 |
| 900 | 0.9 |
| 1,000 | 1 |
| 1,024 | 1.024 |
| 1,500 | 1.5 |
| 2,000 | 2 |
| 3,000 | 3 |
| 4,000 | 4 |
| 4,700 | 4.7 |
| 5,000 | 5 |
| 8,500 | 8.5 |
| 10,000 | 10 |
| 25,000 | 25 |
| 50,000 | 50 |
Gigabyte to Megabyte chart
The reverse direction for values people often look up.
| Gigabyte (GB) | Megabyte (MB) |
|---|---|
| 0.1 | 100 |
| 0.25 | 250 |
| 0.5 | 500 |
| 0.75 | 750 |
| 1 | 1,000 |
| 1.5 | 1,500 |
| 2 | 2,000 |
| 3 | 3,000 |
| 4 | 4,000 |
| 8 | 8,000 |
| 16 | 16,000 |
| 32 | 32,000 |
File and disc sizes in megabytes
| Item | Megabyte (MB) | Gigabyte (GB) |
|---|---|---|
| 3.5-inch HD floppy disk (1,474,560 bytes) | 1.4746 | 0.0015 |
| Three minutes of 256 kbps audio | 5.76 | 0.0058 |
| Gmail attachment limit | 25 | 0.025 |
| 80-minute CD-R data capacity (737,280,000 bytes) | 737.28 | 0.7373 |
| Single-layer recordable DVD | 4,700 | 4.7 |
| Dual-layer recordable DVD | 8,500 | 8.5 |
Quick mental estimate
Move the decimal point three places to the left: 4,700 MB → 4.7 GB. Dividing by 1,000 is exact in decimal units; dividing by 1,024 would give binary GiB from MiB instead.
Use the converter or the charts when the exact figure matters.
The two units
Megabyte (MB): A megabyte (MB) is 1,000,000 bytes (10^6), or eight megabits. The binary amount 1,048,576 bytes is a mebibyte (MiB), not a decimal megabyte.
Gigabyte (GB): A gigabyte is 1,000,000,000 bytes (10^9). A capacity of 500 decimal GB is about 465.66 GiB; the differing numbers describe the same number of bytes.
Frequently asked questions
Is 1 GB 1,000 MB or 1,024 MB?
In decimal SI units, which this converter uses, 1 GB is exactly 1,000 MB. The 1,024 figure belongs to the binary units, where 1 GiB is 1,024 MiB; some software still labels those GB and MB.
Why can a 24 MB file fail to send under a 25 MB email limit?
Email encodes attachments as text, which adds about a third to their size, so a 24 MB file can grow past the limit once encoded. Files close to the limit are usually better shared as a link.
How many MB fit on a CD?
A standard 80-minute CD-R holds 737,280,000 bytes of data, about 737 MB in decimal units or 703 MiB in binary units, which is why it is sold as a "700 MB" disc. A single-layer DVD, by contrast, is labeled in decimal gigabytes.
How precise is the result?
The converter uses the exact definitions above with browser floating-point arithmetic and shows up to 12 significant digits. The charts round to four decimal places for reading.
Sources
Last updated:
Page address with these inputs: https://kakao.mobile/tools/megabyte-to-gigabyte-converter/
Cite or embed this tool
kakaoCalc. (2026, November 8). Megabytes to Gigabytes Converter (MB to GB). https://kakao.mobile/tools/megabyte-to-gigabyte-converter/
“Megabytes to Gigabytes Converter (MB to GB).” kakaoCalc, 8 Nov. 2026, kakao.mobile/tools/megabyte-to-gigabyte-converter/.
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