Electrical field tools
Electrical Calculations
Solve electrical quantities and check circuit performance with field-focused calculations.
Basic Electrical Math
Solve common electrical quantities, circuit relationships, and field-unit conversions.
Ohm’s Law and Power CalculatorCalculate electrical values and AC power.AC Power and Current CalculatorCalculate AC current from real power, voltage, phase, and power factor.Electrical Unit ConverterConvert electrical quantities and conductor area.Series and Parallel Resistance CalculatorCalculate equivalent resistance, source current, and branch values for simple resistive circuits.Voltage Divider CalculatorEstimate divider output, including the effect of an optional resistive load.Current Divider CalculatorCalculate equivalent resistance and branch currents for parallel resistive branches.Resistive Load Bank CalculatorCalculate element voltage, line current, and total power for single-phase or balanced three-phase resistive load banks.Resistive Load Voltage Change CalculatorCompare current and power when a fixed-resistance load operates at a different voltage.
AC Power & Power Quality
Estimate power-factor correction and screen three-phase voltage or current unbalance.
Capacitor Bank Capacitance CalculatorEstimate power-factor correction kVAR and capacitance.Fundamental Neutral Current CalculatorPhasor-sum fundamental phase currents for supported split-phase and three-phase wye systems.Harmonic Distortion CalculatorCalculate THD and total RMS from fundamental and harmonic measurements.Power Factor Correction CalculatorEstimate the reactive-power compensation needed to raise a lagging displacement power factor.Three-Phase Voltage Unbalance CalculatorCalculate maximum deviation from average using three measured line-to-line voltages.Three-Phase Current Imbalance CalculatorCalculate average phase current and maximum percent deviation across three readings.AC Impedance and Reactance CalculatorEstimate reactance, impedance magnitude, and phase angle for a simple series RLC circuit.RLC Resonant Frequency CalculatorCalculate ideal LC resonant frequency from inductance and capacitance.
Measurements & Test Calculations
Scale instrumentation signals, calculate transformer ratios, and check current-loop burden.
Current Transformer Ratio CalculatorConvert measured CT secondary current to estimated primary current using entered nameplate ratings.Instrument Transformer Meter Multiplier CalculatorCombine CT and PT ratios and adjust a register value for an existing meter multiplier.4–20 mA Signal Scaling CalculatorConvert loop current to an engineering value or calculate current from a configured range.Current Loop Load Resistance CalculatorEstimate the remaining allowable loop resistance from supply voltage and entered device voltage drops.
Transformer Calculations
Calculate transformer winding current and control-transformer loading.
Control Transformer Load CalculatorCompare continuous and startup control VA with transformer capacity.Transformer Current and Overcurrent Protection CalculatorCalculate winding current and review primary/secondary device limits.Transformer kVA Sizing CalculatorAdd user-selected headroom to an entered load demand and compare a selected transformer rating.Buck-Boost Transformer CalculatorEstimate correction voltage, winding current, and transformed VA for buck-boost applications.Transformer Turns Ratio CalculatorCalculate ideal winding voltage, turns, and current relationships from winding values.Transformer Tap Voltage CalculatorEstimate secondary voltage from actual supply voltage and a selected primary nameplate tap.Transformer Voltage Regulation CalculatorCalculate measured voltage regulation or estimate it from resistance, reactance, and load power factor.Transformer Efficiency and Loss CalculatorEstimate load-dependent losses, efficiency, annual loss energy, and energy cost from entered test data.Open-Delta Transformer Capacity CalculatorEstimate balanced-bank capacity for two equal transformer units in an open-delta arrangement.