RAID Calculator

Enter your drive count and capacity to see usable storage, efficiency, fault tolerance and rough read/write speed across common RAID levels.

Drives

Prefilling from your selected drives — adjust if this array differs.

Number of drives

Capacity per drive

RAID level

Parity drives

1 parity drive is RAID 5, 2 is RAID 6 — pick more for extra fault tolerance on larger arrays.

Usable capacity

of raw

Efficiency

Fault tolerance

Read speed

Write speed

Speeds are a rough multiple of a single drive's throughput. Actual performance depends on drive type (HDD/SSD/NVMe), controller and workload — parity levels take a bigger real-world hit on small random writes than shown here.

drives × in

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