Online Circuit Diagrams

I need help finding online site in which will find current, voltage, and such thing by inputing the values of the circuit. In parallel and series in RC.
Basically find and easier way to find the values of the circuit.
EX. fiding the current of the circuit by inputing the voltage and resistor.
The site should show missing values by inputing the givin values.

Why not just learn how to apply Ohms and Kirchoff's laws?

I like to program the equations into a spreadsheet, and then pulg in different values for the various components. I especially like using this method when doing filter design.