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RAID Capacity Calculator

Lifestyle Tools

RAID 0/1/5/6/10 usable space and fault tolerance

Quick Answer

RAID Capacity Calculator: RAID 0/1/5/6/10 usable space and fault tolerance. RAID Capacity Calculator uses standard everyday life formulas to compute accurate results instantly.

pcs
TB

RAID level

Usable capacity
12 TB
of 16 TB raw
Efficiency75%
Fault tolerance1
Raw capacity16 TB
Parity overhead4 TB

Calculation steps

  1. 1RAID 5: usable = 3 × 4 TB = 12 TB of 16 TB raw (75% efficiency)
  2. 2Fault tolerance: survives 1 simultaneous disk failure(s)
  3. 3Note: marketed TB (10¹²) vs TiB shown by OS (2⁴⁰) — OS will display ~9% less.

All levels compared

LevelUsableEfficiencyFault tol.
RAID 016 TB100%0 disk(s)
RAID 14 TB25%3 disk(s)
RAID 512 TB75%1 disk(s)
RAID 68 TB50%2 disk(s)
RAID 108 TB50%2 disk(s)

Level characteristics

RAID 0Striping: fastest, no redundancy — one failure loses all
RAID 1Mirror: fast reads, 50% efficiency
RAID 5Distributed parity: balanced capacity/redundancy
RAID 6Double parity: survives 2 failures, safer rebuild
RAID 10Mirror+stripe: fast & robust, 50% efficiency
RAID 50Striped RAID5 sets: large & fast (2 groups assumed)
RAID is not backup — it protects against disk failure, not deletion, ransomware or fire. Keep 3-2-1 backups (3 copies, 2 media, 1 offsite). For large HDDs (>8TB), prefer RAID 6/10: rebuild times on RAID 5 can exceed 24h with high URE risk.

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How to Use

  1. Enter scenario values: fill real-life numbers into the RAID Capacity Calculator (defaults work for a quick try).
  2. Instant results: everything computes live, no button needed.
  3. Read the advice: results come with practical tips, reference standards and pitfalls.
  4. Compare options: adjust parameters to compare choices side by side.

Key Points

  • RAID Capacity Calculator is a free online everyday life tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: RAID 0/1/5/6/10 usable space and fault tolerance.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

RAID Capacity Calculator formula

RAID Capacity Calculator uses standard everyday life formulas to compute accurate results instantly.

FAQ

How do I use the RAID Capacity Calculator?
Open the page and fill in the input fields — results update automatically. RAID 0/1/5/6/10 usable space and fault tolerance.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on common formulas and industry conventions. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. RAID Capacity Calculator[EB/OL]. https://www.yijiansuan.com/en/c/life/raid

Results provided by this tool are for reference only and do not constitute professional advice.