RAID 0, 1, 5, 6 & 10 Usable Storage Capacity Calculator
Compare usable storage capacity, parity overhead, and drive failure tolerance across RAID 5, RAID 6, and RAID 10.
Reviewed by: Alexei Volkov • Principal Systems & Cloud Infrastructure Architect
Methodology: Verified Formula
Presets:
RAID 5 Usable Capacity (1-Drive Parity)
40.0 TB (36.4 TiB)
RAID 6 Usable (2-Drive Parity)
32.0 TB
RAID 10 Usable (Mirrored Stripes)
24.0 TB (Raw: 48 TB)
True OS binary capacity (TiB) is ~90.95% of decimal TB.
Scenario Comparison & Benchmark Table (RAID Storage Calculator)
Compare how scaling Number of Hard Drives / SSDs affects your output (click any row to load those values into the calculator above):
| Number of Hard Drives / SSDs | RAID 5 Usable Capacity (1-Drive Parity) | RAID 6 Usable (2-Drive Parity) | RAID 10 Usable (Mirrored Stripes) |
|---|---|---|---|
| 3 | 16.0 TB (14.6 TiB) | 8.0 TB | 8.0 TB (Raw: 24 TB) |
| 5 | 32.0 TB (29.1 TiB) | 24.0 TB | 16.0 TB (Raw: 40 TB) |
| 6 (Baseline) | 40.0 TB (36.4 TiB) | 32.0 TB | 24.0 TB (Raw: 48 TB) |
| 8 | 56.0 TB (50.9 TiB) | 48.0 TB | 32.0 TB (Raw: 64 TB) |
| 9 | 64.0 TB (58.2 TiB) | 56.0 TB | 32.0 TB (Raw: 72 TB) |
| 12 | 88.0 TB (80.0 TiB) | 80.0 TB | 48.0 TB (Raw: 96 TB) |
Mathematical Formula & Step-by-Step Guide
Primary mathematical equation used by this model:
RAID 5 = (N - 1) × Size; RAID 6 = (N - 2) × Size; RAID 10 = (N / 2) × Size
- Configure your primary input (Number of Hard Drives / SSDs, baseline set to 6) using either the direct numeric box or synchronized range slider.
- Adjust the remaining parameters (Single Drive Capacity (TB)) to mirror your exact scenario.
- Examine the primary output alongside the secondary breakdown metrics and the 6-tier benchmark comparison table below.
Primary Standards & References: IETF RFC 8259 (JSON), RFC 4648 (Base64), RFC 9562 (UUIDv4), IEEE 802.3 / CIDR RFC 4632, POSIX.1-2017 File Permissions & Official 2026 LLM Tokenizer Pricing
All encoding, formatting, and cryptographic operations execute 100% locally in your browser via Web Crypto & V8 APIs—zero payload data leaves your device.
All encoding, formatting, and cryptographic operations execute 100% locally in your browser via Web Crypto & V8 APIs—zero payload data leaves your device.
Frequently Asked Questions — RAID Storage Calculator
What mathematical formula does the RAID 0, 1, 5, 6 & 10 Usable Storage Capacity Calculator use?
This calculator implements the verified relationship: RAID 5 = (N - 1) × Size; RAID 6 = (N - 2) × Size; RAID 10 = (N / 2) × Size. Each variable (Number of Hard Drives / SSDs, Single Drive Capacity (TB)) is evaluated in real time using double-precision floating-point arithmetic so there is zero rounding drift across multi-step scenarios.
How does changing Number of Hard Drives / SSDs impact the final result?
Number of Hard Drives / SSDs acts as the primary driver in this model (default baseline: 6). Use the Reference Benchmark Table on this page to compare how scaling Number of Hard Drives / SSDs from conservative to aggressive levels changes both the primary outcome and secondary ratios.
What standards and sources back this RAID Storage Calculator methodology?
Our model is audited by Alexei Volkov • Principal Systems & Cloud Infrastructure Architect and calibrated against IETF RFC 8259 (JSON), RFC 4648 (Base64), RFC 9562 (UUIDv4), IEEE 802.3 / CIDR RFC 4632, POSIX.1-2017 File Permissions & Official 2026 LLM Tokenizer Pricing. Note: All encoding, formatting, and cryptographic operations execute 100% locally in your browser via Web Crypto & V8 APIs—zero payload data leaves your device.