The Appliance Electricity Cost Calculator estimates operating expenses for household appliances and electronics based on power wattage ratings, daily operating hours, and local electric rates.

### Energy Consumption & Cost Formulas Utility companies bill electric service based on total kilowatt-hours (kWh) consumed: - **Daily Energy Consumption**: $$\text{Daily kWh} = \frac{\text{Wattage (W)} \times \text{Daily Hours}}{1{,}000}$$ - **Monthly & Annual Energy Usage**: $$\text{Monthly kWh} = \text{Daily kWh} \times 30.4 \quad (\text{average days per month})$$ $$\text{Annual kWh} = \text{Daily kWh} \times 365$$ - **Financial Operating Costs**: $$\text{Cost} = \text{Energy Consumed (kWh)} \times \text{Electric Rate ($/kWh)}$$

### Worked Calculation Example Estimating the cost to run a 1,500 Watt portable space heater for 6 hours each day at an electric rate of $0.16/kWh: - **Daily Energy Use**: $(1{,}500 \times 6) / 1{,}000 = 9.00\text{ kWh/day}$ - **Daily Cost**: $9.00 \times \$0.16 = \$1.44\text{ per day}$ - **Monthly Consumption**: $9.00 \times 30.4 = 273.60\text{ kWh/month}$ - **Monthly Cost**: $273.60 \times \$0.16 = \$43.78\text{ per month}$ - **Annual Cost**: $(9.00 \times 365) \times \$0.16 = 3{,}285.00 \times \$0.16 = \$525.60\text{ per year}$

### In-Browser Processing & Privacy Calculations update instantly inside your browser tab without network calls. No utility bills, appliance selections, or operating habits are logged or sent to any server.