⚡ 12V/24V Wire Size Calculator

Wire Size Calculator

Prevent fires in your van: calculate the required wire cross-section in mm² based on amperage and distance.

System Voltage

Max Current (I)

Distance (One-way)

Max Voltage Drop

Minimum Cross-Section

0.00 mm²

Recommended Standard

0 mm²

Always protect the wire with an appropriate fuse!

Based on Copper at 20°C (ρ = 0.0175 Ω·mm²/m)

Why calculate wire size?

In DC current (12V, 24V), the current (Amps) is very high for a given power. If the wire is too thin or too long, it will heat up (Joule effect) and cause a voltage drop. This can damage your devices, or worse, cause a fire. You should aim for a maximum voltage drop of 3% for the general circuit, and 1% for critical charging circuits (solar panels, chargers).

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