20 kW at 415 V: how many amps?
34.78 A at PF 0.80 when 20 kW is electrical input.
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Single-phase current
Calculate single-phase AC current from electrical kW, apparent kVA or motor shaft output with the correct rating basis.
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kVA / MVA to amps
Convert kVA or MVA to single-phase or balanced three-phase line current with a visible voltage reference and formula.
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Line / phase converter
Convert line and phase voltage or current for balanced star and delta connections, with formulas and a connection diagram.
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kW / kVA / amps converter
Convert DC, single-phase and balanced three-phase load ratings with visible assumptions.
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Amps to kW
Estimate active electrical power from current, voltage and power factor.
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Three-phase current
Calculate balanced three-phase line current from power, line voltage and power factor.
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Neutral current
Estimate fundamental neutral current from three phase-current magnitudes separated by 120°.
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Transformer full-load current
Calculate transformer full-load current or estimate operating kVA and percentage of nameplate loading.
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Power-factor correction
Estimate the preliminary kVAr needed to move from an existing to a target power factor.
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Voltage drop
Check R/X, mV/A/m or simplified resistivity-based voltage drop.
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Maximum cable length
Estimate the maximum one-way route length for a selected voltage-drop target.
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Amps to kWh
Estimate electricity units from current, voltage, power factor and operating hours for one steady interval.
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Transformer fault estimate
See the three-phase transformer-only terminal-fault shortcut using your nameplate kVA, secondary voltage and percentage impedance.
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Third-harmonic neutral
Estimate the neutral third-harmonic component only when equal, coherent per-phase harmonic RMS measurements are available.
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Preliminary cable size
Evaluate custom cable candidates against ampacity, correction and voltage-drop checks.
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Preliminary breaker size
Review nominal rating options against the preliminary Ib ≤ In ≤ Iz relationship.
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Load schedule
Save local circuits, demand totals and phase-balance information.
Open tool →WORKED ANSWERS
Popular electrical calculations
Each quick answer depends on the stated conditions. Open the full explanation before applying a number to a different circuit.
Is line current the same as phase current?
Equal in balanced star; line current is √3 times branch current in balanced delta.
How do three phases add in the neutral?
100 A, 80 A and 60 A give 34.64 A for 120° separated fundamental currents.
How many units does a 10 A load use in six hours?
At 230 V single phase and PF 0.90, the steady-interval estimate is 12.42 kWh—not a meter reading.
Does power factor change a motor’s efficiency?
No. Power factor relates active and apparent electrical power; efficiency relates electrical input and shaft output.
What happens to conductor resistance when it heats?
An illustrative copper model rises about 23.6% from 20°C to 80°C.
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