RAID calculator

Calculate usable capacity, efficiency and fault tolerance for RAID 0, 1, 5, 6 and 10 based on disk count and size.

Runs in your browser · nothing is sentCapacity & reliability

Number of disksSize per disk (TB)

RAID protects against disk failure, not against deletion, corruption or ransomware. It is not a backup.

About this tool

Pick a RAID level, enter the number and size of disks and compare usable space and failure tolerance.

🔒 Your input stays in your browser and is never sent anywhere.

Is RAID a backup?

No. RAID keeps a system running after a disk failure, but it does not protect against deletion, corruption or ransomware.

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