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IT_TOOLS_

RAID Calculator

Compare array capacity, redundancy and idealized performance for equal-sized drives.

Local processing

This tool processes your input in your browser.

[IN] Array configuration

Up to 24 equal-sized drives. No hot spares included.

[OUT] Capacity & resilience

Usable capacity12 TB
Drive fault tolerance1 drive
Raw capacity16 TB
Redundancy overhead4 TB
Storage efficiency75.0% usable

[MAP] Drive roles

  • Drive 1Data + parity
  • Drive 2Data + parity
  • Drive 3Data + parity
  • Drive 4Data + parity

Data and parity are distributed across all drives. Parity uses the equivalent capacity of one drive.

Performance & capacity assumptions

Idealized sequential throughput: reads up to 3× one drive; writes depend on parity and workload. These are scaling limits, not benchmark predictions.

Controller, workload, rebuilds and filesystem overhead affect results. GB and TB are decimal units. RAID redundancy does not replace a backup.

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