Quickly estimate usable storage, redundancy, and fault-tolerance across RAID levels.

Raid Capacity Calculator

RAID Capacity Calculator Estimate how much usable storage you’ll get from your drives with different RAID levels. Enter the number of disks and disk size, then select a RAID type to see your effective capacity, fault tolerance, and redundancy trade-offs. RAID 0 → Maximum performance, no redundancy RAID 1 → Full mirroring, 50% usable capacity RAID 5 → Balanced storage & protection, 1 disk for parity RAID 6 → Extra redundancy, 2 disks for parity RAID 10 → Performance + mirroring, 50% usable capacity

RAID Capacity Calculator

Quickly estimate usable storage, redundancy, and parity overhead for common RAID levels.

TB
TB reserved*
4×4TB RAID5 6×8TB RAID6 8×10TB RAID10 2×20TB RAID1

* Optional reserved capacity for metadata/hot spares/mixed drive sizes. This is a simplified model; filesystem/formatting overhead is not included.

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