Home Energy Calculator
Track appliance electricity consumption, estimate monthly costs, and discover the most impactful ways to reduce your energy bills.
Home Energy Calculator
Calculate electricity usage, costs, and get energy efficiency recommendations
Energy Settings
Typical Home Electricity Usage by Appliance
Heating & Cooling
• Central AC: 3,500W
• Electric furnace: 10,000-15,000W
• Heat pump: 5,000W (3x more efficient)
• Window AC: 1,200W
Water Heating
• Electric water heater: 4,500W
• Heat pump water heater: 1,500W
• Annual cost (traditional): ~$500/yr
• Heat pump saves 60-70%
Kitchen Appliances
• Refrigerator: 150W (runs ~8hrs/day)
• Electric oven: 2,000-3,000W
• Dishwasher: 1,200-1,500W per cycle
• Microwave: 1,000W
Lighting & Electronics
• LED bulb: 8-10W (vs 60W incandescent)
• LED TV 55": 80-120W
• Desktop computer: 150-300W
• Gaming console: 100-200W
Frequently Asked Questions
What uses the most electricity in a typical home?
Heating and cooling (HVAC) accounts for about 47% of home energy use, followed by water heating (17%), lighting (15%), and appliances (13%). Refrigerators alone use 1-2 kWh/day. A central air conditioner uses 3,000-5,000W per hour of operation. Identifying your biggest consumers is the first step to meaningful energy savings.
How do I calculate the electricity cost of an appliance?
Formula: Monthly cost = Wattage / 1,000 × Hours used per day × 30 × Electricity rate ($/kWh). Example: A 150W TV running 5 hours/day at $0.13/kWh: 150/1000 × 5 × 30 × 0.13 = $2.93/month. The US average electricity rate is about $0.13-0.16/kWh.
What are the most effective ways to reduce electricity bills?
Top strategies ranked by savings: 1) Upgrade to a heat pump HVAC system (saves 30-50% vs. resistance heating), 2) Add insulation and air seal your home, 3) Replace incandescent bulbs with LED (75% less energy), 4) Use a programmable thermostat (saves 10-15%), 5) Unplug vampire loads (standby power costs average US home $100-200/year), 6) Consider solar panels if economically viable.
What is phantom load or vampire energy?
Phantom load (vampire power) is electricity consumed by devices even when turned off or in standby mode. TVs, game consoles, phone chargers, cable boxes, and microwaves all draw power continuously. The average US home wastes about $100-200/year on standby power. Use smart power strips or unplug devices when not in use.
How much does an electric vehicle charger affect electricity costs?
A Level 2 EV charger uses 7.2-11.5 kW. Charging a 75 kWh battery from empty: 7.4-10 hours, using about 75-82 kWh (accounting for charging losses). At $0.14/kWh average: $10.50-11.50 per full charge vs. $40-60 for equivalent gasoline. Annual extra electricity cost for average EV driver (12,000 miles/year): approximately $500-700.