CALCULATOR DIRECTORY
Electrical calculators
Transparent preliminary tools for power, current, voltage drop, conductors and protection. Each result exposes its equation and assumptions.
Power and current
Single-phase current
Calculate single-phase AC current from electrical kW, apparent kVA or motor shaft output with the correct rating basis.
Open tool →kVA / MVA to amps
Convert kVA or MVA to single-phase or balanced three-phase line current with a visible voltage reference and formula.
Open tool →Line / phase converter
Convert line and phase voltage or current for balanced star and delta connections, with formulas and a connection diagram.
Open tool →kW / kVA / amps converter
Convert DC, single-phase and balanced three-phase load ratings with visible assumptions.
Open tool →Amps to kW
Estimate active electrical power from current, voltage and power factor.
Open tool →Three-phase current
Calculate balanced three-phase line current from power, line voltage and power factor.
Open tool →Neutral current
Estimate fundamental neutral current from three phase-current magnitudes separated by 120°.
Open tool →Transformer full-load current
Calculate transformer full-load current or estimate operating kVA and percentage of nameplate loading.
Open tool →Power-factor correction
Estimate the preliminary kVAr needed to move from an existing to a target power factor.
Open tool →Amps to kWh
Estimate electricity units from current, voltage, power factor and operating hours for one steady interval.
Open tool →Third-harmonic neutral
Estimate the neutral third-harmonic component only when equal, coherent per-phase harmonic RMS measurements are available.
Open tool →Circuit performance
Conductors and protection
Transformer fault estimate
See the three-phase transformer-only terminal-fault shortcut using your nameplate kVA, secondary voltage and percentage impedance.
Open tool →Preliminary cable size
Evaluate custom cable candidates against ampacity, correction and voltage-drop checks.
Open tool →Preliminary breaker size
Review nominal rating options against the preliminary Ib ≤ In ≤ Iz relationship.
Open tool →