Manual Calculation

Volts x Amperes = watts                1000 Watts = 1 kilowatt (kW)

Kilowatt-Hours=kw x hours=kWh
kWh x cost per kWh = Cost

Example:

Motor 120 volts, 6 amps on for 12 hours at $0.068 per kWh for 30 days

120 volts x 6 Amps = 720 Watts

720 Watts/1000 watts = .72kW
0.72kW x 12 hours = 8.64 kWh
8.64 kWh x 0.068 = 0.58
0.58 x 30 days = $17.40