About the b to gb calculation
One byte is exactly 1.0000e-9 gigabytes, so converting between them is a single multiplication. Enter any value above and the result updates as you type. Eight bits, and the base unit every other storage figure is built from. Decimal gigabyte. This is why a "1 TB" drive shows as roughly 931 GB in your operating system.
Formula
GB = B × 1.0000e-9
1 B = 1.0000e-9 GB
1 GB = 1,000,000,000 BWorked example
To convert 1,024 B, multiply by 1.0000e-9: 1,024 × 1.0000e-9 = 0.00000102 GB.
Frequently asked questions
How many gigabytes are in a byte?
There are 1.0000e-9 gigabytes in one byte. To convert any amount, multiply the number of bytes by 1.0000e-9.
How do I convert gigabytes back to bytes?
Divide instead of multiplying, or equivalently multiply by 1,000,000,000. One gigabyte is 1,000,000,000 bytes.
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?
Bytes: eight bits, and the base unit every other storage figure is built from. Gigabytes: decimal gigabyte. This is why a "1 TB" drive shows as roughly 931 GB in your operating system.
Sources
- IEC 80000-13 — binary and decimal prefixes for information units