As an electrical engineer, I have to jump in here. If you are wondering how much it costs to run the pump, then simply multiplying voltage and current will give you a misleading answer. A typical electric motor has a relatively poor power factor (maybe somewhere between 0.6 and 0.8), and therefore the apparent power (V*I) will be rather larger than the real power (V*I*PF). The electric company only charges you for the real power you use. There are some losses in the wires between the electric meter and the load (in this case the pump motor), and having extra current there can add to the real power consumed (because those loses are resistive) - but that would be really small for a typical pool pump.
To really find out the power consumption, you need a watt meter. If you don't have that, then if you have an oscilloscope, you can calculate the power factor using the phase difference between the voltage and current curves. But I'm guessing you may not have an oscilloscope available either. So without a watt meter or an oscilloscope, perhaps your best bet is to just estimate the power factor (I would guess 0.75, realizing that it might be lower) and then calculated the power as Voltage (Volts RMS) * Current (Amps RMS) * PF.