Quettabytes (QB) to Zettabytes (ZB) Converter
Convert quettabytes to zettabytes.
1 QB = 1,000,000,000 ZB
How to convert QB to ZB
File sizes here use the decimal (SI) system, the same one drive makers and network providers use. In that system 1 Quettabyte is 1030 bytes and 1 Zettabyte is 1021 bytes. Divide one by the other and you get the ratio between the two units: 1030 ÷ 1021 = 109.
Quettabyte is the bigger unit, so you multiply. Every QB holds 1,000,000,000 ZB, which means the decimal point moves 9 places to the right.
On the ladder (B → KB → MB → GB → TB → PB → EB → ZB → YB → RB → QB) these two are 3 steps apart. Every step is a factor of 1,000, so 3 steps means 1,000 multiplied by itself 3 times, which is 109.
The formula
ZB = QB × 1,000,000,0001 QB = 1,000,000,000 ZB
Worked example 1: Converting 1 QB
1 QB × 1,000,000,000 = 1,000,000,000 ZBThe decimal point moves 9 places to the right.
The quettabyte is the largest SI-prefixed byte unit, and nothing stores data at that scale.
Worked example 2: Converting 0.5 QB
0.5 QB × 1,000,000,000 = 500,000,000 ZBThe decimal point moves 9 places to the right.
Worked example 3: Converting 12.75 QB
12.75 QB × 1,000,000,000 = 12,750,000,000 ZBThe decimal point moves 9 places to the right.
Need the other direction? Open the ZB to QB converter.
QB to ZB examples
The quettabyte is the largest SI-prefixed byte unit, and nothing stores data at that scale. In zettabytes that is 1,000,000,000 ZB.
| QB | ZB |
|---|---|
| 1 QB | 1,000,000,000 ZB |
| 2.5 QB | 2,500,000,000 ZB |
| 10 QB | 10,000,000,000 ZB |
| 50 QB | 50,000,000,000 ZB |
| 100 QB | 100,000,000,000 ZB |
| 500 QB | 500,000,000,000 ZB |
| 1,000 QB | 1,000,000,000,000 ZB |
Where QB to ZB comes up
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.
A zettabyte is 1,000 exabytes, or a trillion gigabytes. Zettabytes appear in market reports and forecasts about how much data the world creates, copies and stores each year.
Going from quettabytes down to zettabytes always gives a bigger number, because the unit you land on is smaller. It is the usual direction when a limit or a form asks for a smaller unit than the one you have in mind.
QB to ZB FAQ
How many zettabytes are in 1 quettabyte?
There are 1,000,000,000 zettabytes in 1 quettabyte, so 1 QB = 1,000,000,000 ZB.
Is QB to ZB 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 ZB to QB?
Go the other way: divide by 1,000,000,000, which moves the decimal point 9 places to the left. The swap button on the converter does it for you.