Gigabytes (GB) to Quettabytes (QB) Converter
Convert gigabytes to quettabytes.
1 GB = 1e-21 QB
How to convert GB to QB
File sizes here use the decimal (SI) system, the same one drive makers and network providers use. In that system 1 Gigabyte is 109 bytes and 1 Quettabyte is 1030 bytes. Divide one by the other and you get the ratio between the two units: 109 ÷ 1030 = 10−21.
Gigabyte is the smaller unit, so you divide. One GB is only 1 × 10−21 of a QB, which means the decimal point moves 21 places to the left.
On the ladder (B → KB → MB → GB → TB → PB → EB → ZB → YB → RB → QB) these two are 7 steps apart. Every step is a factor of 1,000, so 7 steps means 1,000 multiplied by itself 7 times, which is 1021.
The formula
QB = GB ÷ 10211 GB = 1 × 10−21 QB1021 means 1 followed by 21 zeros
Worked example 1: Converting 4.7 GB
4.7 GB ÷ 1021 = 4.7 × 10−21 QBThe decimal point moves 21 places to the left.
4.7 GB is the capacity of a single-layer DVD.
Worked example 2: Converting 0.5 GB
0.5 GB ÷ 1021 = 5 × 10−22 QBThe decimal point moves 21 places to the left.
Worked example 3: Converting 12.75 GB
12.75 GB ÷ 1021 = 1.275 × 10−20 QBThe decimal point moves 21 places to the left.
Need the other direction? Open the QB to GB converter.
GB to QB examples
4.7 GB is the capacity of a single-layer DVD. In quettabytes that is 4.7 × 10−21 QB.
| GB | QB |
|---|---|
| 1 GB | 1 × 10−21 QB |
| 2.5 GB | 2.5 × 10−21 QB |
| 10 GB | 1 × 10−20 QB |
| 50 GB | 5 × 10−20 QB |
| 100 GB | 1 × 10−19 QB |
| 500 GB | 5 × 10−19 QB |
| 1,000 GB | 1 × 10−18 QB |
Where GB to QB comes up
A gigabyte is 1,000 megabytes, about 250 photos at 4 MB each. Gigabytes are the language of phone storage, RAM, mobile data plans, game installs and USB sticks.
Quetta- is the SI prefix for 1030, also adopted in 2022, so a quettabyte is 1,000 ronnabytes. Quettabytes are the top of the official SI ladder. They turn up in unit tables and in explanations of the newest prefixes.
Going from gigabytes up to quettabytes always gives a smaller number, because you are counting in bigger chunks. People do it to make a long number readable, or to compare a file with the size of a drive or a plan.
GB to QB FAQ
How many quettabytes are in 1 gigabyte?
One gigabyte is 1 × 10−21 of a quettabyte. It takes 1021 gigabytes to make 1 quettabyte.
Is GB to QB decimal or binary?
This page is decimal (SI), where 1 KB = 1,000 B. Operating systems often count in powers of 1,024 and still print KB, MB or GB, when they really mean KiB, MiB and GiB. At QB the gap is wider still.
How do I convert QB to GB?
Go the other way: multiply by 1021, which moves the decimal point 21 places to the right. The swap button on the converter does it for you.