https://www.raidz-calculator.com/
Free RAIDZ Calculator - Caclulate ZFS RAIDZ Array Capacity and Fault Tolerance.
Online RAIDz calculator to assist ZFS RAIDz planning. Calculates capacity, speed and fault tolerance characteristics for a RAIDZ0, RAIDZ1, and RAIDZ3 setups.
raidz calculatorfreezfsarraycapacity