By ToolzHive
About this tool
Calculate usable capacity, fault tolerance and speed for RAID 0, 1, 5, 6, 10 and more.
How to use RAID Calculator
- Choose the RAID level.
- Enter the number of disks and the size of each disk.
- Compare usable capacity, redundancy and fault tolerance.
Worked example
Four 4 TB disks in RAID 5 give 12 TB usable and survive one disk failure. The same disks in RAID 10 give 8 TB but rebuild faster.
Is RAID a backup?
No. RAID keeps a system running when a disk fails, but it does not protect against deletion, ransomware, fire or controller failure.
Why does my system show less space?
Operating systems count in tebibytes (1,024-based), while disks are sold in terabytes (1,000-based), so 12 TB shows as about 10.9 TiB.
Put this guide into practice
- RAID Calculator — Calculate usable capacity, fault tolerance and speed for RAID 0, 1, 5, 6, 10 and more.