Gigabytes to Megabytes Converter (GB to MB)
1 GB = 1,000 MB in decimal (SI) units. Convert gigabytes to megabytes to compare storage, downloads and upload limits, with GB and MB charts.
Megabyte (MB) = Gigabyte (GB) × 1000
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): 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) | Megabyte (MB) |
|---|---|
| 1 | 1000 |
| 5 | 5000 |
| 10 | 10000 |
| 25 | 25000 |
| 50 | 50000 |
| 100 | 100000 |
Upload forms, email services and older software often set limits in megabytes, while storage, phone plans and downloads are quoted in gigabytes. Turning gigabytes into megabytes answers questions such as how many 250 MB videos fit in 15 GB of free cloud storage (60 of them), or whether a 1.2 GB recording will pass a 1,000 MB upload cap (it will not).
This page uses decimal units, so 1 GB is exactly 1,000 MB, the way drive makers and the SI count. Some operating systems divide by 1,024 instead; their "GB" is really a gibibyte of 1,073,741,824 bytes, and the terabytes to gigabytes page shows how that changes the numbers on a new drive.
How to use this tool
- Type a value in the Gigabyte box to see it in megabytes, or type in the Megabyte 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
Megabyte (MB) = Gigabyte (GB) × 1000
Gigabyte (GB) = Megabyte (MB) × 0.001
Both factors come from exact definitions: 1 megabyte = 0.001 gigabytes and 1 gigabyte = 1000 megabytes (shown to 12 significant digits).
Example
Two conversions worked with the same factors the converter uses:
2.5 GB × 1000 = 2500 MB
750 MB × 0.001 = 0.75 GB
Gigabyte to Megabyte chart
Common values from gigabytes to megabytes, rounded to four decimal places.
| Gigabyte (GB) | Megabyte (MB) |
|---|---|
| 0.05 | 50 |
| 0.2 | 200 |
| 0.3 | 300 |
| 0.4 | 400 |
| 0.6 | 600 |
| 1.2 | 1,200 |
| 1.25 | 1,250 |
| 2.5 | 2,500 |
| 4.29 | 4,290 |
| 5 | 5,000 |
| 6 | 6,000 |
| 7.5 | 7,500 |
| 10 | 10,000 |
| 12 | 12,000 |
| 15 | 15,000 |
| 20 | 20,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 64 | 64,000 |
| 100 | 100,000 |
| 128 | 128,000 |
| 256 | 256,000 |
Megabyte to Gigabyte chart
The reverse direction for values people often look up.
| Megabyte (MB) | Gigabyte (GB) |
|---|---|
| 15 | 0.015 |
| 40 | 0.04 |
| 64 | 0.064 |
| 128 | 0.128 |
| 150 | 0.15 |
| 256 | 0.256 |
| 350 | 0.35 |
| 512 | 0.512 |
| 600 | 0.6 |
| 1,200 | 1.2 |
| 2,500 | 2.5 |
| 6,000 | 6 |
| 12,000 | 12 |
Storage sizes given in gigabytes
| Item | Gigabyte (GB) | Megabyte (MB) |
|---|---|---|
| FAT32 largest file, 4 GiB minus one byte | 4.295 | 4,294.97 |
| Free iCloud storage | 5 | 5,000 |
| Free storage with a Google Account | 15 | 15,000 |
| Single-layer Blu-ray disc | 25 | 25,000 |
| Dual-layer Blu-ray disc | 50 | 50,000 |
| Triple-layer Ultra HD Blu-ray disc | 100 | 100,000 |
Quick mental estimate
Multiply by 1,000, moving the decimal point three places right: 2.5 GB → 2,500 MB. If a program counts in binary units, multiply by 1,024 instead to get MiB from GiB.
Use the converter or the charts when the exact figure matters.
The two units
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): 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.
Frequently asked questions
How many MB is 1 GB?
Exactly 1,000 MB in decimal units. In binary units, 1 GiB is 1,024 MiB, a figure some operating systems still label as GB and MB. That binary gigabyte holds 1,073.74 decimal megabytes.
Why won't a 4.5 GB video copy to my USB stick?
Drives formatted as FAT32 cannot hold a single file larger than 4 GiB minus one byte, which is 4,294,967,295 bytes or just under 4,295 MB. Reformatting the drive as exFAT or NTFS removes that limit, and exFAT can be read and written by current Windows and macOS versions.
How much is 1.5 GB of mobile data in MB?
1.5 GB is 1,500 MB in decimal units. Carriers set their own counting rules in their terms, so check whether a plan treats a gigabyte as 1,000 or 1,024 megabytes.
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/gigabyte-to-megabyte-converter/
Cite or embed this tool
kakaoCalc. (2026, November 8). Gigabytes to Megabytes Converter (GB to MB). https://kakao.mobile/tools/gigabyte-to-megabyte-converter/
“Gigabytes to Megabytes Converter (GB to MB).” kakaoCalc, 8 Nov. 2026, kakao.mobile/tools/gigabyte-to-megabyte-converter/.
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