Updated: 12/31/2022 by Computer Hope

Zetta (Z) is a prefix used with the metric system that is equal to 1021, or 1,000,000,000,000,000,000,000 (sextillion). A good example of where this prefix is used with computers is with a ZB (zettabyte). The zetta prefix was added as an SI (Systems of Units) in 1991.

What prefix is before a zetta?

An exa is the prefix used before a zetta.

What prefix is after a zetta?

A yotta is the prefix used after a zetta.

Measurements, SI, Z, Zettabyte