Cable & Wire Calculator – Cable Size, Voltage Drop & Current Rating | CircuitSecrets

Cable & Wire Calculators

Professional electrical engineering tools following IEC 60364 & IEEE standards.

System & Installation Parameters

Phase Three Phase (3Φ) Single Phase (1Φ)

Voltage (V)

Load Current (A)

Power Factor (cos φ)

Cable Size (mm²) Auto-Calculate 1.5 2.5 4 6 10 16 25 35 50 70 95 120 150 185 240 300 400

Cable Length (m)

Conductor Material Copper (Cu) Aluminium (Al)

Installation Method Cable Tray / Ladder Enclosed / Conduit Direct Buried

Ambient Temp (°C)

Recommended Cable Size

Calculates minimum required size based on load current, 125% safety margin, and derating factors.

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Required Cable Size

-- mm²

Current Capacity (Derated)

-- A

Design Load Current (125%)	-- A
Base Current Rating	-- A
Total Applied Derating Factor	--

Voltage Drop Calculator

Estimates voltage drop based on cable length, size, and load current. Standard limit is 5%.

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Voltage Drop (%)

-- %

Voltage Drop (V)

-- V

System Voltage	-- V
Operating Cable Size	-- mm²
Maximum Allowable Drop (5%)	-- V

Current Rating Calculator

Calculates actual current carrying capacity after applying environmental derating.

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Derated Current Rating

-- A

Base Current Rating

-- A

Safe Load Current (80% of Derated)	-- A
Evaluated Cable Size	-- mm²

Disclaimer: This calculator is intended for estimation and educational purposes only. Always verify calculations with official cable manufacturer data and ensure compliance with local electrical codes and standards (e.g., IEC 60364, BS 7671, NEC) before real-world installation.