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RAID Capacity Calculator

Find usable RAID capacity by level.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

Usable capacity depends on how a RAID level distributes data and redundancy across n disks of a given size: RAID 0 (striping, no redundancy) gives the full n × disk size but no fault tolerance; RAID 5 (single parity) gives (n − 1) × disk size, tolerating one disk failure; RAID 6 (double parity) gives (n − 2) × disk size, tolerating two simultaneous failures; and RAID 10 (mirrored stripes) gives (n / 2) × disk size, since every disk is mirrored.

IT sysadmins and storage engineers use this when designing NAS or SAN arrays to balance capacity, performance, and fault tolerance for a given budget, data-center architects use it when specifying storage for enterprise servers, and home-lab and NAS hobbyists (running Synology, TrueNAS, or Unraid setups) use it to decide how many drives and what RAID level gets them the storage and redundancy they need.

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