Circuits and power
Electrical Engineering Calculators
Calculate voltage, current, resistance, power, frequency, wire sizing, filters, and common circuit relationships.
Tools
13 calculators
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AC Power Calculator
Compute real, reactive, and apparent power in single-phase or three-phase AC circuits.
Cutoff Frequency Calculator
Calculate cutoff frequencies for RC and RL filter circuits.
Inductor Calculator
Calculate inductance for air-core or magnetic-core coils.
Ohm's Law Calculator
Find voltage, current, resistance, or power using Ohm's law.
Power Factor Calculator
Estimate power factor and AC circuit efficiency.
RC / RL / RLC Circuit Calculator
Analyze impedance, phase angle, and resonance for common circuit types.
Resistor Color Code Calculator
Read resistor values from color bands.
Resonant Frequency Calculator
Determine resonant frequency for LC circuits.
Series & Parallel Resistor / Capacitor Calculator
Calculate equivalent resistance or capacitance.
Transformer Calculator
Calculate transformer primary current, secondary current, kVA, and voltage or turns ratio.
Voltage Divider Calculator
Calculate output voltage for resistor divider circuits.
Voltage Drop Calculator
Estimate conductor voltage drop from wire size, length, material, and current.
Wire Size Calculator
Find suitable wire gauge from load current and allowable voltage drop.
About this category
Electrical Engineering Calculators for Circuits, Power, and Wire Sizing
Use EngLab electrical engineering calculators to solve common circuit and power problems, including Ohm's law, AC power, transformer current, transformer kVA, voltage drop, voltage dividers, power factor, wire sizing, resistor color codes, equivalent resistance, equivalent capacitance, filter cutoff frequency, inductance, and resonant frequency. These tools are designed for fast electrical calculations in design checks, coursework, troubleshooting, panel planning, wiring estimates, and component selection.
The electrical calculator library covers practical formulas for voltage, current, resistance, impedance, real power, reactive power, apparent power, conductor voltage drop, RC and RL filters, RLC circuits, and series or parallel components. Use the results for early-stage engineering checks and learning, then verify final designs against applicable electrical codes, manufacturer datasheets, conductor ratings, protection requirements, and project specifications.