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Electrical calculators

Free calculation tools for electricians, photovoltaic installers, engineers and technically minded homeowners. Each calculator solves one specific problem, explains the method used and states its assumptions.

Cables and conductors

Voltage drop calculator Calculate voltage drop in volts and percent, cable power loss and the smallest cross-section that meets your … Basic ★
Cable current capacity Coming soon
Current-carrying capacity (buried) Coming soon
Conduit fill Coming soon

Protective devices

Breaker sizing Coming soon
Earth conductor sizing Coming soon
EV charger circuit Coming soon

Photovoltaics

PV string sizing Coming soon
Panel row spacing Coming soon
PV annual production Coming soon
Solar payback & ROI Coming soon

General

Power calculator Coming soon