Quettabytes (QB) to Petabytes (PB) Converter
Convert quettabytes to petabytes.
1 QB = 1,000,000,000,000,000 PB
How to convert QB to PB
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 Petabyte is 1015 bytes. Divide one by the other and you get the ratio between the two units: 1030 ÷ 1015 = 1015.
Quettabyte is the bigger unit, so you multiply. Every QB holds 1015 PB, which means the decimal point moves 15 places to the right.
On the ladder (B → KB → MB → GB → TB → PB → EB → ZB → YB → RB → QB) these two are 5 steps apart. Every step is a factor of 1,000, so 5 steps means 1,000 multiplied by itself 5 times, which is 1015.
The formula
PB = QB × 10151 QB = 1 × 1015 PB1015 means 1 followed by 15 zeros
Worked example 1: Converting 1 QB
1 QB × 1015 = 1 × 1015 PBThe decimal point moves 15 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 × 1015 = 500,000,000,000,000 PBThe decimal point moves 15 places to the right.
Worked example 3: Converting 12.75 QB
12.75 QB × 1015 = 1.275 × 1016 PBThe decimal point moves 15 places to the right.
Need the other direction? Open the PB to QB converter.
QB to PB examples
The quettabyte is the largest SI-prefixed byte unit, and nothing stores data at that scale. In petabytes that is 1 × 1015 PB.
| QB | PB |
|---|---|
| 1 QB | 1 × 1015 PB |
| 2.5 QB | 2.5 × 1015 PB |
| 10 QB | 1 × 1016 PB |
| 50 QB | 5 × 1016 PB |
| 100 QB | 1 × 1017 PB |
| 500 QB | 5 × 1017 PB |
| 1,000 QB | 1 × 1018 PB |
Where QB to PB 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 petabyte is 1,000 terabytes, or a million gigabytes. Petabytes belong to data centres, research archives, big analytics warehouses and the storage side of large cloud services.
Going from quettabytes down to petabytes 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 PB FAQ
How many petabytes are in 1 quettabyte?
There are 1015 petabytes in 1 quettabyte, so 1 QB = 1015 PB.
Is QB to PB 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 PB to QB?
Go the other way: divide by 1015, which moves the decimal point 15 places to the left. The swap button on the converter does it for you.