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RAID calculator

See how much usable space you get and how many drives can fail before you lose data.

Drives are sold in decimal units (1 TB = 1,000,000,000,000 bytes). Windows and many tools show binary TiB, so the same drive looks smaller there.

How to use the RAID calculator

  1. Choose a RAID level.
  2. Enter the number and size of the drives.
  3. Read the usable space and how many drives can fail.

Frequently asked questions

Is RAID a backup?

No. RAID keeps a system running when a drive fails, but it does not protect against deleted files or ransomware.

Why does my OS show less space?

Drives are sold in decimal TB, while many systems show binary TiB.

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