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Technology & Systems Calculators

Utility calculators for sysadmins, DevOps, network engineers, and IT professionals. Calculate RAID storage and fault tolerance, UPS battery runtime, server rack space & power, CCTV video storage, subnet masks, and byte sizing.

RAID Storage & Capacity

Calculate usable capacity, parity overhead, fault tolerance, and TB vs TiB across RAID levels.

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RAID Array Configuration

TB / Drive

Minimum for RAID 5: 3 drives

Standby drives waiting for an automatic rebuild

Storage Space Distribution

75%
Parity
Usable: 48.0 TB
Parity: 16.0 TB
Hot Spare: 0.0 TB

Array Capacity Summary

Usable Storage Capacity
48.0 TB

Actual OS Available: 43.66 TiB (Windows / Linux)

Total Raw Capacity64.0 TB58.2 TiB raw
Storage Efficiency75.0%Usable of raw pool
Fault Tolerance & Reliability1 drive
Read Speed Gain3x
Write Speed Gain~0.8x (Parity write penalty)

TB vs TiB (Why is OS Space Lower?)

Hard drive manufacturers calculate capacity using the decimal system:
1 TB = 1,000,000,000,000 bytes (10¹²).

Operating systems (Windows, Linux, TrueNAS) calculate file sizes using the binary system:
1 TiB = 1,048,576,000,000 bytes (1024⁴).

Every 1 TB drive appears as approximately 0.909 TiB in your storage manager.