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Raidcapacity Calculator

Our storage & raid tool computes raidcapacity accurately. Enter your inputs for detailed analysis and optimization tips.

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Computer & IT

Raidcapacity Calculator

Calculate RAID array usable capacity, storage efficiency, and fault tolerance for RAID 0, 1, 5, 6, 10, and 50 configurations.

Last updated: December 2025

Calculator

Adjust values & calculate
Usable Capacity
3.00 TB
3000 GB | 75.0% storage efficiency
Total Raw
4000 GB
Parity/Mirror
1000 GB
Fault Tolerance
1 disk(s)
Capacity Breakdown
75.0% usable
25.0% overhead
Read Performance
3x single disk
Write Performance
Reduced (parity overhead)
Est. Total Cost (@$30/TB)
$120.00
Effective Cost per TB
$40.00
RAID 5: Striping with distributed parity. One disk of parity spread across all disks.
Note: RAID is not a backup solution. Always maintain separate backups. Actual usable capacity may vary slightly due to filesystem overhead and manufacturer size definitions.
Your Result
Usable: 3000 GB (3.00 TB) | Efficiency: 75.0% | Fault Tolerance: 1 disk(s)
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Understand the Math

Formula

Usable = (N - P) x Disk Size

Where N is the number of disks, P is the number of parity/mirror disks (varies by RAID level), and Disk Size is the capacity of each individual drive. RAID 0: P=0, RAID 1: P=N-1, RAID 5: P=1, RAID 6: P=2, RAID 10: P=N/2.

Last reviewed: December 2025

Worked Examples

Example 1: NAS with RAID 5

You have 4 x 4TB drives configured in RAID 5. Calculate usable capacity and storage efficiency.
Solution:
Total raw capacity: 4 x 4,000 GB = 16,000 GB RAID 5 usable: (n-1) x disk size = 3 x 4,000 = 12,000 GB Parity overhead: 1 x 4,000 = 4,000 GB Storage efficiency: 12,000 / 16,000 = 75% Fault tolerance: 1 disk failure
Result: Usable: 12,000 GB (12 TB) | Efficiency: 75% | Fault tolerance: 1 disk

Example 2: Database Server with RAID 10

A database server uses 6 x 2TB SSDs in RAID 10. Calculate usable capacity and performance characteristics.
Solution:
Total raw capacity: 6 x 2,000 GB = 12,000 GB RAID 10 usable: (n/2) x disk size = 3 x 2,000 = 6,000 GB Mirror overhead: 6,000 GB Storage efficiency: 6,000 / 12,000 = 50% Read performance: 6x single disk Write performance: 3x single disk
Result: Usable: 6,000 GB (6 TB) | Efficiency: 50% | Read: 6x, Write: 3x single disk speed
Expert Insights

Background & Theory

The Raidcapacity Calculator applies the following established principles and formulas. Computers represent all information using binary, a base-2 number system consisting solely of the digits 0 and 1, each called a bit. Because long binary strings are unwieldy, programmers routinely use octal (base 8) and hexadecimal (base 16) as compact shorthand. Converting between bases follows a consistent algorithm: divide the source number repeatedly by the target base, collecting remainders in reverse order. Hexadecimal digits A through F represent the values 10 through 15, allowing a single character to encode four binary bits, making it the preferred notation for memory addresses, color codes, and bytecode. Bitwise operations manipulate individual bits within integers. AND produces a 1 only when both input bits are 1, making it useful for masking. OR produces a 1 when either bit is 1 and is used for combining flags. XOR flips bits that differ, enabling simple toggle logic and efficient swap algorithms. NOT inverts every bit (one's complement), while left and right shifts multiply or divide by powers of two in constant time. Data storage units ascend in binary multiples of 1024: 8 bits form one byte, 1024 bytes form one kibibyte (KiB), 1024 KiB form one mebibyte (MiB), and so forth. Hard-drive manufacturers historically use decimal prefixes (1 KB = 1000 bytes), creating the persistent confusion between binary and decimal interpretations of the same label. The IEC standardized the binary prefixes KiB, MiB, GiB, and TiB in 1998 to resolve this ambiguity. Network bandwidth is measured in bits per second (bps), most commonly megabits per second (Mbps) or gigabits per second (Gbps). A 100 Mbps connection transfers 100 million bits every second, equating to roughly 12.5 megabytes per second. IP subnet masks define network boundaries; CIDR notation appends a prefix length (e.g., /24) to an address, indicating how many leading bits are fixed. A /24 subnet contains 256 addresses with 254 usable hosts. Algorithm efficiency is described using Big-O notation, which characterises the worst-case growth of time or space relative to input size. O(1) is constant, O(log n) is logarithmic (binary search), O(n) is linear, and O(nยฒ) is quadratic. Cryptographic hash functions like SHA-256 produce a fixed 256-bit (32-byte) digest regardless of input length. File compression algorithms exploit statistical redundancy to reduce storage footprint, and compression ratio equals the original file size divided by the compressed size.

History

The history behind the Raidcapacity Calculator traces back through the following developments. The conceptual foundation of modern computing traces back to Charles Babbage, whose Analytical Engine design of 1837 introduced the idea of a general-purpose mechanical computer with separate storage and processing units, including what he called the Store and the Mill. Ada Lovelace wrote what many consider the first algorithm intended for machine execution while annotating a translation of Luigi Menabrea's account of Babbage's work, also recognising the machine's potential to manipulate symbols beyond mere numbers. George Boole published "The Laws of Thought" in 1854, formalising a two-valued algebra of logic that would later map perfectly to electrical circuits. It remained largely a mathematical curiosity until Claude Shannon's landmark 1937 master's thesis demonstrated that Boolean algebra could describe switching circuits, laying the theoretical groundwork for all digital electronics. Shannon's 1948 paper "A Mathematical Theory of Communication" defined the bit as the fundamental unit of information and established information theory as a rigorous discipline. The same year, the transistor was invented at Bell Labs by Bardeen, Brattain, and Shockley, eventually replacing vacuum tubes and enabling miniaturisation at scale. ENIAC, completed in 1945, was one of the first general-purpose electronic computers, occupying 1800 square feet and consuming 150 kilowatts of power while performing roughly 5000 additions per second. The ASCII standard was ratified in 1963, assigning 7-bit codes to 128 characters and enabling interoperability between computers from different manufacturers. Through the 1970s, the microprocessor consolidated an entire CPU onto a single chip; Intel's 4004 in 1971 marked the beginning of this trend. The Apple II launched in 1977 and the IBM PC in 1981 brought computing to homes and offices, triggering a mass-market software industry. Tim Berners-Lee proposed the World Wide Web in 1989 and launched the first website in 1991 at CERN, transforming the internet from an academic and military network into a global information infrastructure. Mobile computing accelerated through the 2000s with smartphones integrating powerful processors, wireless networking, and GPS into pocket-sized devices, extending computation into every facet of daily life and cementing TCP/IP as the universal communications fabric.

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Frequently Asked Questions

You may use the results for reference and educational purposes. For professional reports, academic papers, or critical decisions, we recommend verifying outputs against peer-reviewed sources or consulting a qualified expert in the relevant field.
All calculations use established mathematical formulas and are performed with high-precision arithmetic. Results are accurate to the precision shown. For critical decisions in finance, medicine, or engineering, always verify results with a qualified professional.
No. All calculations run entirely in your browser using JavaScript. No data you enter is ever transmitted to any server or stored anywhere. Your inputs remain completely private.
The Formula section on this page shows the equation used. You can reproduce the calculation manually or in a spreadsheet using those steps. Compare your answer against the worked examples in the Examples section, which use known reference values so you can confirm the calculator is behaving as expected.
Enter values as precisely as possible using the correct units for each field. Check that you have selected the right unit (e.g. kilograms vs pounds, meters vs feet) before calculating. Rounding inputs early can reduce output precision.
Once the page is loaded, the calculation logic runs entirely in your browser. If you have already opened the page, most calculators will continue to work even if your internet connection is lost, since no server requests are needed for computation.
Educational Note: This calculator is provided for educational and informational purposes. Results are based on the formulas and inputs provided. Always verify important calculations independently. NovaCalculator processes calculator inputs client-side; optional analytics follow visitor consent settings. ยฉ 2024โ€“2026 NovaCalculator.

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Formula

Usable = (N - P) x Disk Size

Where N is the number of disks, P is the number of parity/mirror disks (varies by RAID level), and Disk Size is the capacity of each individual drive. RAID 0: P=0, RAID 1: P=N-1, RAID 5: P=1, RAID 6: P=2, RAID 10: P=N/2.

Worked Examples

Example 1: NAS with RAID 5

Problem: You have 4 x 4TB drives configured in RAID 5. Calculate usable capacity and storage efficiency.

Solution: Total raw capacity: 4 x 4,000 GB = 16,000 GB\nRAID 5 usable: (n-1) x disk size = 3 x 4,000 = 12,000 GB\nParity overhead: 1 x 4,000 = 4,000 GB\nStorage efficiency: 12,000 / 16,000 = 75%\nFault tolerance: 1 disk failure

Result: Usable: 12,000 GB (12 TB) | Efficiency: 75% | Fault tolerance: 1 disk

Example 2: Database Server with RAID 10

Problem: A database server uses 6 x 2TB SSDs in RAID 10. Calculate usable capacity and performance characteristics.

Solution: Total raw capacity: 6 x 2,000 GB = 12,000 GB\nRAID 10 usable: (n/2) x disk size = 3 x 2,000 = 6,000 GB\nMirror overhead: 6,000 GB\nStorage efficiency: 6,000 / 12,000 = 50%\nRead performance: 6x single disk\nWrite performance: 3x single disk

Result: Usable: 6,000 GB (6 TB) | Efficiency: 50% | Read: 6x, Write: 3x single disk speed

Frequently Asked Questions

Can I use Raidcapacity Calculator on a mobile device?

Yes. All calculators on NovaCalculator are fully responsive and work on smartphones, tablets, and desktops. The layout adapts automatically to your screen size.

Is my data stored or sent to a server?

No. All calculations run entirely in your browser using JavaScript. No data you enter is ever transmitted to any server or stored anywhere. Your inputs remain completely private.

How accurate are the results from Raidcapacity Calculator?

All calculations use established mathematical formulas and are performed with high-precision arithmetic. Results are accurate to the precision shown. For critical decisions in finance, medicine, or engineering, always verify results with a qualified professional.

How do I verify Raidcapacity Calculator's result independently?

The Formula section on this page shows the equation used. You can reproduce the calculation manually or in a spreadsheet using those steps. Compare your answer against the worked examples in the Examples section, which use known reference values so you can confirm the calculator is behaving as expected.

Why might my result differ from another tool or reference?

Differences typically arise from rounding conventions, the specific version of a formula (for example, simple vs compound interest), or unit inconsistencies between inputs. Check that both tools are using the same formula variant and the same units. The References section links to the authoritative source behind the formula used here.

How do I interpret the result?

Results are displayed with a label and unit to help you understand the output. Many calculators include a short explanation or classification below the result (for example, a BMI category or risk level). Refer to the worked examples section on this page for real-world context.

References

Reviewed by Daniel Agrici, Founder & Lead Developer ยท Editorial policy