About the gb to kb calculation
One gigabyte is exactly 1,000,000 kilobytes, so converting between them is a single multiplication. Enter any value above and the result updates as you type. Decimal gigabyte. This is why a "1 TB" drive shows as roughly 931 GB in your operating system. Decimal kilobyte — 1,000 bytes. Windows and macOS often mean 1,024 when they write "KB".
Formula
KB = GB × 1,000,000
1 GB = 1,000,000 KB
1 KB = 0.000001 GBWorked example
To convert 1 GB, multiply by 1,000,000: 1 × 1,000,000 = 1,000,000 KB.
Frequently asked questions
How many kilobytes are in a gigabyte?
There are 1,000,000 kilobytes in one gigabyte. To convert any amount, multiply the number of gigabytes by 1,000,000.
How do I convert kilobytes back to gigabytes?
Divide instead of multiplying, or equivalently multiply by 0.000001. One kilobyte is 0.000001 gigabytes.
Is this conversion exact?
Yes, provided both sides use the same convention. Decimal units (KB, MB, GB) are powers of 1,000 and binary units (KiB, MiB, GiB) are powers of 1,024. Both are exact — the confusion comes from software labelling binary values with decimal names.
Where is each of these units used?
Gigabytes: decimal gigabyte. This is why a "1 TB" drive shows as roughly 931 GB in your operating system. Kilobytes: decimal kilobyte — 1,000 bytes. Windows and macOS often mean 1,024 when they write "KB".
Sources
- IEC 80000-13 — binary and decimal prefixes for information units