RAID Capacity Calculator
Calculate practical technology metrics with transparent formulas, units and assumptions.
Calculator details
Enter the technical values below. Use the information icons for guidance.
Real-world throughput, battery runtime and storage can differ because of overhead, hardware behavior and vendor conventions.
Your results
Calculated from the values entered.
✓ Calculated
Formula & calculation method
RAID 0=N×S; RAID1=S; RAID5=(N−1)×S; RAID6=(N−2)×S; RAID10=N/2×S.
Formula version 1.0
The RAID calculator estimates a practical technology quantity from the values you enter. The calculation method is shown clearly so you can understand the result instead of relying on a black box.
Related searches such as RAID capacity calculator, RAID 5 calculator, RAID 10 calculator are covered naturally on this page rather than creating thin near-duplicate URLs.
What the RAID Capacity Calculator calculates
Estimate raw and usable storage for common RAID levels.
- Approx. usable capacity (TB): Capacity after RAID overhead.
- Raw capacity (TB): All drives combined.
- Indicative fault tolerance: Simplified tolerance.
How to use this calculator
- Enter the requested technical values.
- Check the field guidance and units.
- Select Calculate.
- Review the main and secondary results.
- Save a result to compare another scenario.
Input definitions
- Number of drives: Equal-size drives.
- Drive size (TB): Capacity per drive.
- RAID level code: Use 0, 1, 5, 6 or 10.
Formula and calculation method
RAID 0=N×S; RAID1=S; RAID5=(N−1)×S; RAID6=(N−2)×S; RAID10=N/2×S.
The engine applies the stated formula directly. Where real systems include overhead or efficiency losses, the calculator either provides a factor or explains the limitation.
Real-world performance differs
Advertised internet speeds, storage capacities and battery ratings do not always equal observed performance. Protocol overhead, signal quality, server limits, battery age, filesystem overhead and manufacturer conventions can all affect real results.
Bits, bytes and capacity conventions
Technology calculations often mix bits and bytes as well as decimal and binary prefixes. Calconly states the convention used. For transfer-rate calculations, eight bits equal one byte.
Common mistakes
- Confusing Mbps with MB/s.
- Treating advertised speed as guaranteed throughput.
- Mixing decimal GB with binary GiB.
- Ignoring efficiency losses in battery or charging estimates.
- Treating RAID as a backup.
Related technology calculators
Frequently asked questions
Why can real transfer time be slower?
Network congestion, Wi-Fi conditions, server limits, protocol overhead and storage speed can reduce actual throughput.
Are these production-sizing tools?
They are useful for planning and sanity checks. Production decisions should also use monitoring data, vendor specifications and workload testing.
Are formulas visible?
Yes. Each calculator includes its calculation method and assumptions.
Methodology
Each Calconly Technology calculator stores its variables, formula and outputs separately from the editorial explanation so the engine remains testable while the page explains conventions and limitations.