Electricity Cost Calculator

How to Calculate Electricity Cost for Any Appliance?

Find the appliance wattage (printed on the label or in the manual). Multiply watts by hours of daily use. Divide by 1,000 to convert to kilowatt-hours (kWh). Multiply by your electricity rate. A 1,500-watt space heater running 8 hours: 1,500 x 8 = 12,000 Wh / 1,000 = 12 kWh x $0.16/kWh = $1.92 per day, $57.60 per month. The calculator above automates this for any wattage, usage pattern, and electricity rate, showing daily, monthly, and annual costs.

What Are Typical Electricity Rates Across the US?

The national average residential electricity rate is approximately $0.16 per kWh. Hawaii leads at $0.43/kWh. California averages $0.30. New England states range $0.22-$0.35. The Southeast averages $0.12-$0.14. Texas varies dramatically by plan ($0.08-$0.18). Idaho and Washington offer the cheapest power at $0.08-$0.10 thanks to hydroelectric generation. Your rate appears on your utility bill, usually under "energy charge" or "price per kWh." Time-of-use plans charge different rates by time of day, with peak afternoon hours costing 2-3x more than off-peak nighttime rates.

Biggest Electricity Users in a Typical Home

Central air conditioning: 3,000-5,000 watts, the single largest consumer in warm climates. Electric water heater: 4,500 watts but cycles on and off, averaging 3-5 kWh daily. Clothes dryer: 5,000 watts per load, roughly $0.50-$0.80 per cycle. Refrigerator: 100-400 watts continuously, $4-$12 per month. Oven/range: 2,000-5,000 watts during use. Electric vehicle charger (Level 2): 7,200 watts, $3-$5 per full charge. Gaming PC: 300-500 watts during play. A window AC unit: 500-1,500 watts. LED lighting for an entire home: typically 200-400 watts total. Understanding which appliances drive your bill helps target the most impactful efficiency improvements.

LED vs Incandescent: Lighting Cost Comparison

A 60-watt incandescent bulb running 5 hours daily costs $1.75/month at $0.16/kWh. The LED equivalent uses only 9 watts and costs $0.26/month - an 85% reduction per bulb. A home with 30 bulbs saves roughly $45/month by switching entirely to LED. LED bulbs last 25,000 hours (approximately 14 years at 5 hours/day) compared to 1,000 hours for incandescent (7 months). The $2-$3 LED purchase price pays for itself in electricity savings within 2-3 months. If you still have incandescent or halogen bulbs in your home, replacing them is the single fastest return on investment in household energy efficiency.

How Much Does Air Conditioning Cost to Run?

A central AC system rated at 3 tons (36,000 BTU) draws approximately 3,500 watts. Running 8 hours daily at $0.16/kWh: $4.48/day or $134/month. A window unit (8,000 BTU, 750 watts) running the same hours costs $0.96/day or $28.80/month. Setting the thermostat 2 degrees higher (from 72 to 74) reduces AC runtime by approximately 10-15%, saving $13-$20/month on central air. Ceiling fans cost $0.01-$0.02/hour to run and allow comfortable thermostat settings 3-4 degrees higher, producing combined savings of $20-$40/month in hot climates.

Phantom Load: Devices That Cost Money While Off

Electronics in standby mode continue drawing power. A cable box draws 15-25 watts constantly, costing $2-$4/month even when the TV is off. Gaming consoles in standby: 5-15 watts. Phone chargers left plugged in: 0.5-1 watt each. Smart speakers: 2-4 watts. The average US home has 20-40 devices drawing phantom power, totaling 50-100 watts continuously, which adds $6-$15/month to the electric bill. Smart power strips that cut power completely when devices are off eliminate this waste. Unplugging phone chargers and turning off power strips before leaving for the day saves $50-$100 per year with zero lifestyle impact.

Solar Panels and Electricity Cost Reduction

A typical residential solar system generates 850-1,000 kWh per installed kW per year. A 6 kW system produces approximately 5,400-6,000 kWh annually, covering 50-70% of average household consumption. At $0.16/kWh, that offsets $864-$960 per year in electricity costs. With net metering (available in most states), excess daytime production credits your bill at the retail rate, effectively using the grid as a battery. System costs of $12,000-$18,000 after the 30% federal tax credit produce payback periods of 7-12 years, with 15-20 years of essentially free electricity afterward.

Reading Your Electricity Bill

The bill shows total kWh consumed during the billing period (typically 28-32 days). Divide total kWh by days for your daily average. A 900 kWh monthly bill means 30 kWh/day. The average US home uses about 886 kWh per month. Your bill may also show peak demand (highest instantaneous draw in kW), which some utilities charge for separately. Comparing month-to-month usage reveals seasonal patterns - summer AC and winter heating drive the highest bills. Year-over-year comparison (this January vs last January) is more informative than sequential months because it controls for seasonal variation.

Frequently asked questions