⚡Electrical Engineering Calculators

Ohm's law, PCB traces, wire gauge, RC circuits. 11 free tools with transparent formulas and quick results.

Calculate current, power and energy using Ohm's Law. Instant V=IR calculator with AI-explained results. Free e...

PCB Trace Width

Calculate minimum PCB trace width for a given current using IPC-2221A. Supports internal and external layers. ...

Wire Gauge & Ampacity

Calculate AWG wire diameter, cross-sectional area, resistance and NEC ampacity. Covers AWG 0–40. Free electric...

Voltage Divider

Calculate output voltage, current and power dissipation for a two-resistor voltage divider. Instant results. F...

RC Time Constant

Calculate RC circuit time constant, -3dB cutoff frequency and capacitor charge time. Returns τ, 5τ and fc. Fre...

Power Factor Correction

Calculate capacitor bank size required to correct lagging power factor. Returns kVAR and µF needed. Free elect...

Calculate active power, reactive power, apparent power and phase angle for a balanced 3-phase AC system. Free ...

LED Resistor Calculator

Calculate the correct current-limiting resistor for an LED. Enter supply voltage, LED forward voltage and forw...

Battery Life Estimator

Estimate battery runtime in hours and days from capacity (mAh/Ah) and average discharge current. Accounts for ...

Transformer Turns Ratio

Calculate transformer turns ratio, primary and secondary currents from voltages and apparent power. Ideal for ...

dB / dBm Converter

Convert between milliwatts, watts, dBm and dBW. Essential for RF, audio, and telecommunications power level ca...