Engineering calculators for circuits, resistors, power, wire sizing, and components.
Calculate Voltage (V), Current (I), Resistance (R), and Power (P) instantly using Ohm's Law relationship formulas.
Compute Single-Phase and Three-Phase AC Power, DC Power, Apparent Power (VA), and Reactive Power (VAR).
Decode 4-band, 5-band, and 6-band resistor color codes to resistance values, tolerances, and temp coefficients.
Calculate required current-limiting series resistor values and power ratings for single or arrayed LEDs.
Determine output voltage, resistor ratios, or missing resistance values in loaded and unloaded voltage divider circuits.
Calculate equivalent resistance for multiple resistors connected in series, parallel, or combination configurations.
Calculate series/parallel total capacitance, stored charge (Q), stored energy (E), and RC time constants (τ).
Calculate inductive reactance (XL), total series/parallel inductance, and resonant frequency (f0) of LC circuits.
Estimate battery backup duration based on capacity (Ah/Wh), load current/power, and depth of discharge.
Select correct AWG wire gauges and calculate voltage drop across copper and aluminum conductors.