Zettabytes (ZB) to Ronnabytes (RB) Converter

File sizes here use the decimal (SI) system, the same one drive makers and network providers use. In that system 1 Zettabyte is 10²¹ bytes and 1 Ronnabyte is 10²⁷ bytes. Divide one by the other and you get the ratio between the two units: 10²¹ ÷ 10²⁷ = 10⁻⁶.

Zettabyte is the smaller unit, so you divide. One ZB is only 0.000001 of a RB, which means the decimal point moves 6 places to the left.

On the ladder (B → KB → MB → GB → TB → PB → EB → ZB → YB → RB → QB) these two are 2 steps apart. Every step is a factor of 1,000, so 2 steps means 1,000 multiplied by itself 2 times, which is 10⁶.

Need the other direction? Open the RB to ZB converter.

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.

Ronna- is the SI prefix for 10²⁷, adopted in November 2022, so a ronnabyte is 1,000 yottabytes. Ronnabytes are new and mostly theoretical. You will see them in unit tables and in pieces about how big future data totals might get.

Going from zettabytes up to ronnabytes 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.