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RAID Storage Calculator

Calculate the usable storage capacity and efficiency of a RAID array from the number of disks, disk size and RAID level.

Usable capacity —

Raw (total) capacity —

Storage efficiency —

About the RAID Storage Calculator

RAID (Redundant Array of Independent Disks) combines multiple physical disks into one logical volume. Depending on the RAID level chosen, some disk capacity is sacrificed for redundancy or performance rather than usable storage.

Formula: RAID 0 = N × Size · RAID 1 = Size · RAID 5 = (N−1) × Size · RAID 6 = (N−2) × Size · RAID 10 = (N÷2) × Size

RAID 0 offers no redundancy but maximum usable space, while RAID 1, 5, 6 and 10 trade some capacity for protection against one or more disk failures. Actual usable space in real systems may be slightly lower due to formatting and controller overhead.