Gigabytes to Megabytes Converter

Gigabytes to Megabytes

Convert gigabytes (GB) to megabytes (MB). Both measure digital storage, and the conversion comes up in computing, storage, internet work.

The Formula

`` megabytes = gigabytes × 1000 gigabytes = megabytes × 0.001 `

One gigabyte is 1,000 megabytes, and one megabyte is 0.001 gigabytes.

Conversion Table

Gigabytes	Megabytes
1 GB	1,000 MB
2 GB	2,000 MB
5 GB	5,000 MB
10 GB	10,000 MB
25 GB	25,000 MB
50 GB	50,000 MB
100 GB	100,000 MB
500 GB	500,000 MB
1,000 GB	1,000,000 MB

The Other Direction

Megabytes	Gigabytes
1 MB	0.001 GB
2 MB	0.002 GB
5 MB	0.005 GB
10 MB	0.01 GB
25 MB	0.025 GB
50 MB	0.05 GB
100 MB	0.1 GB
500 MB	0.5 GB
1,000 MB	1 GB

What Each Unit Is

Gigabytes (GB) — 1,000,000,000 bytes in decimal usage. The unit of modern storage and mobile data plans.

Megabytes (MB) — 1,000,000 bytes in decimal usage. The file-size unit of the CD-ROM era.

A Sense of Scale

• An HD film is 4–8 GB
• A phone ships with 128–512 GB
• An MP3 is 3–5 MB
• A phone photo is 2–5 MB
• A JS bundle should stay under 1 MB

Precision

The factor 1000 is exact by international agreement, not a rounded approximation. Any imprecision in a result comes from your input, not the conversion.

In Code

`javascript const gigabyteToMegabyte = (value) => value * 1000; ``

Where This Conversion Comes Up

• Computing
• Storage
• Internet
• Media
• Backups

How Many Decimals Do You Need?

Rounding the factor costs accuracy, and how much depends on the factor. Converting 137 GB with the factor truncated at each decimal place:

Decimals kept	Factor	137 GB becomes	Error
0	1000	137,000	—
1	1000	137,000	—
2	1000	137,000	—
3	1000	137,000	—
4	1000	137,000	—

A rule that holds for any conversion: round once, at the end. Rounding the factor and then multiplying compounds the error through every subsequent calculation, while carrying full precision and rounding the final answer does not.

The right number of significant figures is set by your input, not by the converter. If you measured gigabytes to three significant figures, the answer in megabytes is only good to three — writing more digits claims precision the measurement never had.

Other Conversions From Gigabytes

The same value in every other unit this converter supports for data:

From	To	Unit
1 GB	8,000,000,000 b	Bits
1 GB	1,000,000,000 B	Bytes
1 GB	8,000,000 Kb	Kilobits
1 GB	1,000,000 KB	Kilobytes
1 GB	8,000 Mb	Megabits
1 GB	0.001 TB	Terabytes

Chaining conversions works — gigabytes to metres to feet gives the same answer as gigabytes to feet — but each step rounds, so a chain of three conversions carries three roundings. Convert directly where a direct factor exists.