ElecToolsHQ — Electrical Calculators, Formulas & Examples
Electrical calculators, formulas, and worked examples for students, apprentices, technicians, electricians, contractors, and engineers — solve problems quickly and understand the concepts behind them.
Categories
Fundamentals
Core electrical concepts: Ohm's Law, voltage, current, and resistance.
Electrical Power
Power calculations, watts, and energy relationships.
Conversions
Unit conversions between electrical quantities.
Single Phase
Single-phase circuit calculations.
Three Phase
Three-phase circuit calculations.
Power Factor
Power factor and reactive power calculations.
Transformers
Transformer ratios, kVA, and turns calculations.
Motors
Motor full-load current, horsepower, and efficiency calculations.
Generators
Generator sizing and output calculations.
Voltage Drop
Voltage drop across conductors and circuit runs.
Conductors
Conductor resistance and resistance-per-length calculations.
Field Math
Practical field calculations for everyday electrical work.