Monthly Electricity Cost$43.92274.5 kWh / mo
Annual Running Cost$525.603285 kWh / yr
Daily Running Cost$1.449 kWh / day
Calculate appliance electricity power consumption, kilowatt-hours (kWh), and energy costs per hour, day, month, and year from wattage and utility rates.
Calculates energy costs per Hour, per Day, per Month, and per Year simultaneously.
Quick presets for Air Conditioner (1500W), Space Heater (1500W), Gaming PC (450W), Refrigerator (150W), and EV Charger (7200W).
Model continuous 24/7 devices or intermittent appliances running 2 hours per day.
Calculate utility budgets locally with zero server tracking.
Daily Power Consumption (kWh) = (Appliance Wattage × Hours Used Per Day) / 1,000.
Monthly Energy Cost = Daily kWh × Days Per Month × Electricity Rate ($/kWh).
Annual Energy Cost = Monthly Cost × 12. All calculations update in real time in client JavaScript.
Calculate how much running a 1,500W space heater for 8 hours a day at $0.15/kWh adds to your monthly electric bill ($54.00/mo).
Estimate monthly power costs for charging an electric vehicle with a 7.2 kW Level 2 home charger.
Calculate annual electricity cost for running a 200W home server 24/7/365 ($262.80/yr at $0.15/kWh).
Compare annual operating costs between an old refrigerator and a new energy-efficient model.
Multiply wattage by hours used per day, divide by 1,000 to get kilowatt-hours (kWh), and multiply by your electric utility rate per kWh.
The average US residential electricity rate is approximately $0.16 to $0.18 per kWh, though rates vary from $0.10/kWh in low-cost states to $0.30+/kWh in California and the Northeast.
Standard portable electric space heaters use 1,500 watts on high. Central air conditioners typically use 3,000 to 5,000 watts, while window AC units use 500 to 1,400 watts.
No. All calculations run strictly inside your local browser memory.
Yes. You can adjust the hours per day and days per month sliders to match any intermittent usage schedule.
Kilowatt-hours (kWh) = (Appliance Watts * Operating Hours per Day) / 1,000.