RAID 5 Calculator
One disk's worth of parity spread across all disks. Risky with large disks, as rebuilds take days. Enter your disks below to see the usable space.
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- Runs in Your Browser
RAID Level
Enter the number of disks and their size.
Disk Space & RAID Calculator
RAID 5 at a glance
Minimum Disks3
Usable With 6 Disks5 of 6 disks
Survives1 disk
Example (6 × 8 TB)40 TB usable
One disk's worth of parity spread across all disks. Risky with large disks, as rebuilds take days.
RAID Levels and Units
Questions
How much usable space does RAID 5 give?
With n equal disks: n − 1 disks. 6 × 8 TB gives 40 TB.
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