RAID calculator

  1. Input
  2. Options
  3. Result

RAID calculator

Compare equal-drive RAID capacity, hot spares and simplified rebuild estimates. Calculate a report and export it.

Options

All drives are assumed to have the same size. Hot spares do not add usable capacity. TB and TiB use different byte counts. Filesystem metadata and controller reserves are not deducted; RAID is not a backup.

Risk note

RAID capacity and risk calculator

Choose a RAID level, disk count, disk size and hot spares to estimate usable storage and overhead.

The comparison table shows RAID levels side by side and estimates a theoretical minimum and workload-adjusted rebuild window from disk size and throughput.

Quick start

Compare equal-drive RAID plans and export a stable report.

  1. Set drives, RAID level and hot spares
  2. Optionally adjust rebuild assumptions
  3. Calculate and inspect usable and reserved capacity
✓ The tool runs directly in the browser and is ready for quick checks without installing software.
✓ Input can be cleared and recalculated immediately, which is useful for repeated small tasks.
✓ Use fullscreen mode when you need more space for long text, structured data or large result blocks.
✓ Copy buttons are available on generated output so results can be reused in code, documents or support chats.
✓ Most operations are deterministic: the same input and options produce the same output.
✓ For sensitive content, prefer local browser tools and review the result before sharing it further.

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