How many megabytes are in 1 gigabyte?

1 GB equals 1000 MB. This is an exact conversion factor defined by NIST.

How do I convert gigabytes to megabytes?

Multiply the value in GB by the conversion factor. For example, 10 GB = 10000 MB. Use our calculator above for instant results.

Is the gigabytes to megabytes conversion exact?

Yes, this conversion is mathematically exact based on the international definition of these units (NIST SP 811).

Can I convert gigabytes to megabytes offline?

Yes! OmniConvert runs entirely in your browser — no internet connection needed after the page loads. Your data never leaves your device, ensuring complete privacy.

What is the difference between gigabytes and megabytes?

Gigabytes (GB) and Megabytes (MB) are both units of digital storage but belong to different measurement systems. 1 GB = 1000 MB. Use the converter above to switch between them instantly.

Gigabytes to Megabytes (GB → MB) — Free Online Converter

GB → MB Reference Table

GB	MB
0.001 GB	1 MB
0.002 GB	2 MB
0.003 GB	3 MB
0.004 GB	4 MB
0.005 GB	5 MB
0.006 GB	6 MB
0.007 GB	7 MB
0.008 GB	8 MB
0.009 GB	9 MB
0.01 GB	10 MB
0.02 GB	20 MB
0.03 GB	30 MB
0.04 GB	40 MB
0.05 GB	50 MB
0.06 GB	60 MB
0.07 GB	70 MB
0.08 GB	80 MB
0.09 GB	90 MB
0.1 GB	100 MB
0.2 GB	200 MB
0.3 GB	300 MB
0.4 GB	400 MB
0.5 GB	500 MB
0.6 GB	600 MB
0.7 GB	700 MB
0.8 GB	800 MB
0.9 GB	900 MB
1 GB	1000 MB
1.5 GB	1500 MB
2 GB	2000 MB
2.5 GB	2500 MB
3 GB	3000 MB
3.5 GB	3500 MB
4 GB	4000 MB
4.5 GB	4500 MB
5 GB	5000 MB
5.5 GB	5500 MB
6 GB	6000 MB
6.5 GB	6500 MB
7 GB	7000 MB
7.5 GB	7500 MB
8 GB	8000 MB
8.5 GB	8500 MB
9 GB	9000 MB
9.5 GB	9500 MB
10 GB	10000 MB
11 GB	11000 MB
12 GB	12000 MB
13 GB	13000 MB
14 GB	14000 MB
15 GB	15000 MB
16 GB	16000 MB
17 GB	17000 MB
18 GB	18000 MB
19 GB	19000 MB
20 GB	20000 MB
25 GB	25000 MB
30 GB	30000 MB
35 GB	35000 MB
40 GB	40000 MB
45 GB	45000 MB
50 GB	50000 MB
55 GB	55000 MB
60 GB	60000 MB
65 GB	65000 MB
70 GB	70000 MB
75 GB	75000 MB
80 GB	80000 MB
85 GB	85000 MB
90 GB	90000 MB
95 GB	95000 MB
100 GB	100000 MB
120 GB	120000 MB
125 GB	125000 MB
130 GB	130000 MB
140 GB	140000 MB
150 GB	150000 MB
160 GB	160000 MB
175 GB	175000 MB
180 GB	180000 MB
200 GB	200000 MB
225 GB	225000 MB
250 GB	250000 MB
275 GB	275000 MB
300 GB	300000 MB
350 GB	350000 MB
400 GB	400000 MB
450 GB	450000 MB
500 GB	500000 MB
600 GB	600000 MB
700 GB	700000 MB
750 GB	750000 MB
800 GB	800000 MB
900 GB	900000 MB
1000 GB	1000000 MB
1200 GB	1200000 MB
1250 GB	1250000 MB
1500 GB	1500000 MB
1750 GB	1750000 MB
2000 GB	2000000 MB
2500 GB	2500000 MB
3000 GB	3000000 MB
4000 GB	4000000 MB
4500 GB	4500000 MB
5000 GB	5000000 MB
6000 GB	6000000 MB
7000 GB	7000000 MB
7500 GB	7500000 MB
8000 GB	8000000 MB
9000 GB	9000000 MB
10000 GB	10000000 MB
15000 GB	15000000 MB
20000 GB	20000000 MB
25000 GB	25000000 MB
50000 GB	50000000 MB
75000 GB	75000000 MB
100000 GB	100000000 MB

Values based on NIST SP 811 conversion factors

Why Convert Gigabytes to Megabytes?

Converting between gigabytes (GB) and megabytes (MB) is one of the most common digital storage conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert GB to MB saves time and prevents errors.

Digital storage conversions (GB to MB) are essential for IT professionals, content creators, and everyday computer users. Understanding the difference between bits and bytes is crucial when calculating internet speeds versus file sizes. Photographers and video editors need to convert terabytes and gigabytes to manage backups and estimate cloud storage costs. Confusion often arises between binary (1024) and decimal (1000) prefixes used by hardware manufacturers versus operating systems, leading to apparent 'missing' space on hard drives. Accurate conversion helps in planning server capacity, data transfer times, and device purchases.

How to Convert Gigabytes to Megabytes

To convert gigabytes to megabytes, use the following formula:

MB = GB × 1000

Example: 1 GB = 1000 MB

For example, 5 GB = 5000 MB, 10 GB = 10000 MB, and 100 GB = 100000 MB. For larger values, 1000 GB = 1000000 MB. Conversely, 1 MB = 0.001 GB. Our calculator above performs this conversion instantly with full precision — no rounding errors.

Common Mistakes to Avoid

Bit vs Byte: 1 Byte = 8 Bits. Internet speed is usually bits (Mb/s), file size is Bytes (MB).
Base 10 vs Base 2: Hard drive makers use Base 10 (1KB=1000B), OS uses Base 2 (1KiB=1024B).
B vs b: MB is Megabyte, Mb is Megabit.

Pro Tips

Storage buying: A 1TB drive usually shows as ~930GB in Windows due to decimal/binary difference.
Data caps: Streaming HD video uses ~3GB/hour.
Backup rule: 3-2-1 rule: 3 copies, 2 media types, 1 offsite.

What is a Gigabyte?

10⁹ bytes.

Movies, RAM.

What is a Megabyte?

1,000,000 bytes.

MP3s, photos.

Gigabytes → Megabytes

Gigabytes to Megabytes Formula