Gigabytes to Kilobytes
An instant gigabytes-to-kilobytes converter, with the formula and a reference table below.
| Gigabytes | Kilobytes |
|---|---|
| 1 GB | 1000000 KB |
| 2 GB | 2000000 KB |
| 3 GB | 3000000 KB |
| 5 GB | 5000000 KB |
| 10 GB | 10000000 KB |
| 25 GB | 25000000 KB |
| 50 GB | 50000000 KB |
| 100 GB | 100000000 KB |
How to use
- Enter a value in the Gigabytes field.
- The Kilobytes figure appears immediately — no button to press.
- Typing in the Kilobytes field converts back to Gigabytes the same way.
- Use the reference table for the values that come up most often.
Gigabytes to Kilobytes formula
The factor from gigabytes to kilobytes is 1000000.
KB = GB × 1000000
Why this factor: the gigabyte and the kilobyte are both defined against the byte, so dividing one definition by the other gives 1000000 directly. Both definitions are set out in full below.
To go the other way, divide by 1000000 — or use the Kilobytes to Gigabytes converter, which is the same calculation reversed.
Worked example
Given 4 GB, multiplying by 1000000 yields 4000000 KB.
4 GB × 1000000 = 4000000 KB
The converter above does this for any value you type, in either direction.
What is a gigabyte?
A gigabyte is one billion bytes — the everyday unit of storage and memory capacity.
Definition: Exactly 1,000,000,000 bytes under SI prefixes. The binary gibibyte (GiB) is 1,073,741,824 bytes.
Where it is used: Phone and laptop storage, RAM capacity, video file sizes, and cloud storage plans.
What is a kilobyte?
A kilobyte is 1,000 bytes in the decimal convention used by storage manufacturers and standards bodies.
Definition: Exactly 1,000 bytes under SI prefixes. The binary equivalent, 1,024 bytes, is properly the kibibyte (KiB).
Where it is used: Small file sizes, text documents, and web page weights.
Worth knowing: This decimal-versus-binary split is why a '1 TB' drive shows as about 931 GB in Windows: the drive uses 10¹², the OS displays 2⁴⁰.
Gigabytes vs Kilobytes
The gigabyte and the kilobyte belong to the same family of units, so converting between them is usually a matter of shifting a decimal point or applying a small whole-number factor.
Frequently asked questions
How many kilobytes are in a gigabyte?
One gigabyte equals 1000000 kilobytes.
What is the formula to convert gigabytes to kilobytes?
Multiply the number of gigabytes by 1000000. To reverse it, divide by 1000000 instead.
How do I convert kilobytes back to gigabytes?
Divide by 1000000, which is the same as multiplying by 1e-06.
How many kilobytes are in 10 gigabytes?
10 GB works out to 10000000 KB.
Is there anything to watch out for with kilobytes?
This decimal-versus-binary split is why a '1 TB' drive shows as about 931 GB in Windows: the drive uses 10¹², the OS displays 2⁴⁰.
How is the gigabyte defined?
Exactly 1,000,000,000 bytes under SI prefixes. The binary gibibyte (GiB) is 1,073,741,824 bytes.