Ohm's Law Calculator
Enter any two values and the others will be calculated automatically.
Capacitor Calculator
Calculate energy stored and reactance for capacitors.
Energy Stored (J)
Enter C and V
Reactance (Ω)
Enter C and f
Resistor Color Code
Enter a resistance value to see color bands, or select colors to calculate resistance.
Color Bands:
Enter resistance value or select color bands
SI Prefix Converter
Convert between SI prefixes (works for any unit: volts, amps, ohms, etc.).
Enter values to see conversion