Gigabytes to Kilobytes Converter

Gigabytes to Kilobytes

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

The Formula

``kilobytes = gigabytes × 1000000 gigabytes = kilobytes × 0.000001`

One gigabyte is 1,000,000 kilobytes, and one kilobyte is 1.0000e-6 gigabytes.

`Conversion Table`

Gigabytes	Kilobytes
1 GB	1,000,000 KB
2 GB	2,000,000 KB
5 GB	5,000,000 KB
10 GB	10,000,000 KB
25 GB	25,000,000 KB
50 GB	50,000,000 KB
100 GB	100,000,000 KB
500 GB	500,000,000 KB
1,000 GB	1,000,000,000 KB

`The Other Direction`

Kilobytes	Gigabytes
1 KB	1.0000e-6 GB
2 KB	2.0000e-6 GB
5 KB	5.0000e-6 GB
10 KB	1.0000e-5 GB
25 KB	2.5000e-5 GB
50 KB	5.0000e-5 GB
100 KB	1.0000e-4 GB
500 KB	5.0000e-4 GB
1,000 KB	0.001 GB

`What Each Unit Is`

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

Kilobytes (KB) — 1,000 bytes in decimal usage; 1,024 bytes in the binary convention (properly a kibibyte). The ambiguity dates to early computing, where 1,024 was close enough to "kilo" to reuse the prefix.

`A Sense of Scale`

An HD film is 4–8 GB


A phone ships with 128–512 GB
A page of plain text is about 2 KB
A small icon is 5–20 KB


Precision
The factor 1000000 is rounded. For engineering work carry more digits than the table above, and round only at the end — rounding at each step compounds.
Watch Out For
This converter uses decimal (1 KB = 1,000 bytes), which is what drive manufacturers and networks use. Windows reports binary, which is why a "1 TB" drive shows as 931 GB.

In Code

`javascript const gigabyteToKilobyte = (value) => value * 1000000;``

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	1000000	137,000,000	—
1	1000000	137,000,000	—
2	1000000	137,000,000	—
3	1000000	137,000,000	—
4	1000000	137,000,000	—

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 kilobytes is only good to three — writing more digits claims precision the measurement never had.

Frequently Asked Questions

How do I convert gigabytes to kilobytes?

Multiply by 1000000. For example, 10 GB is 10,000,000 KB. Going the other way, divide by 1000000 or multiply by 0.000001.

How many kilobytes are in one gigabyte?

Exactly 1,000,000 kilobytes in one gigabyte, so 25 GB is 25,000,000 KB and 100 GB is 100,000,000 KB. Going the other way, one kilobyte is 1.0000e-6 gigabytes.

Is the gigabytes to kilobytes conversion exact?

The factor 1000000 is rounded. For engineering work carry more digits than the table above, and round only at the end — rounding at each step compounds.

What mistakes are common with gigabytes and kilobytes?

This converter uses decimal (1 KB = 1,000 bytes), which is what drive manufacturers and networks use. Windows reports binary, which is why a "1 TB" drive shows as 931 GB.

Gigabytes to Kilobytes Converter