Every now and then resistors must be connected in parallel or series. With ohmic resistors the calculation is simple. The calculation of the parallel or series connection of reactances is possible under the same rules. On this webpage you can calculate reactances with two coils, two capacitors and a capacitor and a coil. The components can thereby also contain resistive components.

If you want to know, how looks the equations used into the script, then see at the mathematical background: Parallel connection.