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RAID Storage Capacity Calculator

Usable capacity for RAID 0/1/5/6/10.

Compute the usable storage capacity of a RAID array given the number of disks, the size per disk in TB, and the RAID level (0, 1, 5, 6, or 10).

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

TB

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

RAID 0: n · size. RAID 1: size. RAID 5: (n − 1) · size. RAID 6: (n − 2) · size. RAID 10: (n / 2) · size.

In depth

Compute the usable storage capacity of a RAID array given the number of disks, the size per disk in TB, and the RAID level (0, 1, 5, 6, or 10).