ElectricalBeginner
Ohm’s Law
Solve the basic resistive relationship among voltage, current, resistance, and power.
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Electrical Engineering
Electrical power, circuits, motors, transformers, generators, conductors, voltage drop, power quality, and commissioning calculations.
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Available calculation tools
24 reviewed tools are available in this collection.
ElectricalIntermediate
Three-Phase Power
Calculate balanced three-phase real, apparent, and reactive power from line voltage, line current, and true power factor.
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Voltage Drop
Estimate single-phase or balanced three-phase voltage drop using a transparent conductor reference, resistance-only estimate, or project-specific AC impedance data.
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Motor Loading
Estimate shaft loading from measured true input power, estimated operating efficiency, and motor nameplate output rating.
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Single-Phase AC Power
Calculate apparent, real, and reactive-power magnitude for a measured single-phase AC load.
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AC Power Triangle
Reconcile signed real and reactive power into apparent power, power-factor magnitude, and power angle.
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Power-Factor Correction
Estimate ideal capacitive kvar required to move a steady lagging load from an initial to a target power factor.
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Three-Phase Demand Current
Calculate balanced three-phase line current from real demand, line voltage, and true power factor.
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Motor Speed and Slip
Calculate induction-motor synchronous speed, slip speed, and percent slip.
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Motor Operating Efficiency
Calculate motor operating efficiency from measured electrical input and independently determined shaft output.
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VFD Frequency and Speed
Estimate loaded motor speed at a new VFD output frequency from a documented reference point.
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Transformer Efficiency
Calculate transformer operating efficiency from useful output and entered no-load and load losses.
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Transformer Voltage Regulation
Quantify secondary-voltage change between documented no-load and loaded conditions using loaded voltage in the denominator.
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Transformer Fault-Current Screen
Estimate transformer-limited balanced three-phase secondary fault current from rating, voltage, and nameplate impedance.
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UPS Battery Runtime
Estimate ideal usable runtime from nominal DC energy, usable depth, conversion efficiency, and constant AC load.
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Battery Capacity
Calculate ideal minimum amp-hour capacity for a constant AC load and required runtime.
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Demand and Load Factor
Calculate demand factor, average demand, and load factor over a user-defined interval.
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Demand Charge
Estimate simple demand charges from a user-entered billing demand, rate, and number of periods.
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Lighting Power Density
Calculate installed lighting power per evaluated floor area and display both W/ft² and W/m².
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Lighting Retrofit Savings
Estimate annual lighting demand, energy, and energy-only cost reduction from existing and proposed connected power.
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Total Harmonic Distortion
Calculate voltage or current THD from the fundamental RMS component and RSS harmonic content.
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Waveform Crest Factor
Calculate crest factor from peak and RMS magnitudes and compare it mathematically with √2.
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CT/PT Meter Scaling
Calculate CT ratio, PT ratio, combined multiplier, and primary power or energy from an unscaled secondary reading.
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Meter Pulse Energy
Convert counted meter pulses with a Wh-per-pulse constant into interval energy and average demand.
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The platform will add field guides, articles, videos, standards notes, templates, and professional workflow resources alongside the Free calculator library.
Explore the resource roadmap- Electrical fundamentals
- Conductors and voltage drop
- Motors and variable-frequency drives
- Emergency power
- Electrical commissioning