Engineering Tools
Ohm's law, resistor networks and colour codes, LED series resistors, decibels, RC constants and wavelength — sized for electronics coursework and bench work.
Ohm's Law Calculator
Solve voltage, current, resistance and power from any two.
Resistor Color Code Calculator
Decode 3, 4, 5 and 6-band resistors to a resistance and tolerance.
Series Resistance Calculator
Add resistors in series and see the total.
Parallel Resistance Calculator
Combine resistors in parallel into one equivalent value.
LED Resistor Calculator
Size the series resistor an LED needs on your supply.
Voltage Divider Calculator
Work out the output voltage of a two-resistor divider.
RC Time Constant Calculator
Time constant, cutoff frequency and charge curve for an RC circuit.
LC Resonant Frequency Calculator
Resonant frequency of an inductor and capacitor.
Decibel Calculator
Convert between ratios and decibels for power or voltage.
Wavelength Calculator
Convert between frequency and wavelength, with antenna lengths.
Metric Prefix Converter
Convert between pico, nano, micro, milli, kilo, mega and giga.