About the gb to tb calculation
One gigabyte is exactly 0.001 terabytes, 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 terabyte — 1,000,000,000,000 bytes.
Formula
TB = GB × 0.001
1 GB = 0.001 TB
1 TB = 1,000 GBWorked example
To convert 1 GB, multiply by 0.001: 1 × 0.001 = 0.001 TB.
Frequently asked questions
How many terabytes are in a gigabyte?
There are 0.001 terabytes in one gigabyte. To convert any amount, multiply the number of gigabytes by 0.001.
How do I convert terabytes back to gigabytes?
Divide instead of multiplying, or equivalently multiply by 1,000. One terabyte is 1,000 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. Terabytes: decimal terabyte — 1,000,000,000,000 bytes.
Sources
- IEC 80000-13 — binary and decimal prefixes for information units