Quettabytes (QB) to Terabytes (TB) Converter
Convert quettabytes to terabytes.
1 QB = 1,000,000,000,000,000,000 TB
How to convert QB to TB
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 Terabyte is 1012 bytes. Divide one by the other and you get the ratio between the two units: 1030 ÷ 1012 = 1018.
Quettabyte is the bigger unit, so you multiply. Every QB holds 1018 TB, which means the decimal point moves 18 places to the right.
On the ladder (B → KB → MB → GB → TB → PB → EB → ZB → YB → RB → QB) these two are 6 steps apart. Every step is a factor of 1,000, so 6 steps means 1,000 multiplied by itself 6 times, which is 1018.
The formula
TB = QB × 10181 QB = 1 × 1018 TB1018 means 1 followed by 18 zeros
Worked example 1: Converting 1 QB
1 QB × 1018 = 1 × 1018 TBThe decimal point moves 18 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 × 1018 = 5 × 1017 TBThe decimal point moves 18 places to the right.
Worked example 3: Converting 12.75 QB
12.75 QB × 1018 = 1.275 × 1019 TBThe decimal point moves 18 places to the right.
Need the other direction? Open the TB to QB converter.
QB to TB examples
The quettabyte is the largest SI-prefixed byte unit, and nothing stores data at that scale. In terabytes that is 1 × 1018 TB.
| QB | TB |
|---|---|
| 1 QB | 1 × 1018 TB |
| 2.5 QB | 2.5 × 1018 TB |
| 10 QB | 1 × 1019 TB |
| 50 QB | 5 × 1019 TB |
| 100 QB | 1 × 1020 TB |
| 500 QB | 5 × 1020 TB |
| 1,000 QB | 1 × 1021 TB |
Where QB to TB 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 terabyte is 1,000 gigabytes, about 250,000 photos at 4 MB each. Terabytes are how consumer SSDs, external drives, home NAS boxes and cloud storage plans are sold.
Going from quettabytes down to terabytes 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 TB FAQ
How many terabytes are in 1 quettabyte?
There are 1018 terabytes in 1 quettabyte, so 1 QB = 1018 TB.
Is QB to TB 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 TB to QB?
Go the other way: divide by 1018, which moves the decimal point 18 places to the left. The swap button on the converter does it for you.