Output
Nominal usable TB
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RAID Capacity Calculator
Estimate usable capacity for common RAID levels and disk counts.
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RAID Capacity Calculator · At a glance
Quick answer: Estimate usable capacity for common RAID levels and disk counts. Usable capacity is nominal before formatting and metadata.
RAID Capacity Calculator
The test loads when you open it. Device access is requested only after you choose to start.
Detailed guide
How to use this tool
- Choose a RAID level, drive count and smallest drive capacity.
- Review the minimum drive requirements for the selected layout.
Input
Values and units entered in the calculator
Browser requirement
Local arithmetic; no hardware access
Processing
Runs on your device; no tool-result upload
How it works and what the result means
The result is a mathematical estimate under the stated formula. It does not read your hardware or change system settings.
Reading the result
Usable capacity is nominal before formatting and metadata. Mixed drive sizes are limited by the smallest capacity in this simplified model.
Worked example and assumptions
usable capacity = usable disk equivalents × smallest disk capacity
Four 4 TB drives: RAID 0 = 16 TB; RAID 5 = 12 TB; RAID 6 = 8 TB; RAID 10 = 8 TB.
RAID 10 requires an even disk count of at least four. Formatting and metadata reduce the nominal result.
Four 4 TB drives: RAID 0 = 16 TB; RAID 5 = 12 TB; RAID 6 = 8 TB; RAID 10 = 8 TB.
RAID 10 requires an even disk count of at least four. Formatting and metadata reduce the nominal result.
What to check next
Check even-count requirements for RAID 10. Do not compare decimal TB directly with binary TiB without conversion.
Keep consistent units and compare the assumptions with your actual game, display or network configuration.
Frequently asked questions
Is RAID a replacement for backup?
No. Redundancy can tolerate some drive failures, but it does not protect against deletion, corruption, theft or every simultaneous failure.
How do I start the RAID Capacity Calculator?
Enter your own values and press Calculate. Units are shown beside each field; invalid or impossible values are rejected.
Does this tool require a download or an account?
No. Open the interactive tool above in a modern browser. The instructions and explanations are available even with JavaScript disabled; running a test needs JavaScript.
Will this change my device or game settings?
No. The calculator or generator only creates a result for you to review. It does not detect or modify your hardware, operating system or game configuration.
Why can another calculator show a different answer?
Compare the units, rounding and assumptions. The same inputs and formula give the same result here; background CPU load does not change the mathematics.