Electricity Cost Calculator — How Much Does Your Power Cost?

Quick kWh Cost Table — What Does X kWh Cost?

Instantly see what any amount of electricity costs at common US and global rates. Find your rate on your electricity bill, then look up your kWh usage below.

The US average electricity rate is $0.16/kWh. Hawaii averages $0.38/kWh; Louisiana averages $0.10/kWh. Enter your exact rate in the calculator above for a precise cost.

How to Calculate Electricity Usage and Cost

Your electricity bill is calculated in kilowatt-hours (kWh). To calculate how much an appliance costs to run: kWh = Watts ÷ 1,000 × Hours Used. Then multiply by your electricity rate: Cost = kWh × Rate.

Example: Running a 1,500-watt space heater for 8 hours/day at $0.15/kWh:
kWh/day = 1,500 ÷ 1,000 × 8 = 12 kWh
Daily cost = 12 × $0.15 = $1.80
Monthly cost (30 days) = $1.80 × 30 = $54.00

Find the wattage of your appliances on the label (usually on the back or bottom), in the owner's manual, or at energystar.gov. For variable-wattage devices (like refrigerators that cycle on and off), use the average wattage or multiply by a duty cycle (a refrigerator typically runs about 35-40% of the time).

The US average residential electricity rate is approximately $0.16/kWh, but rates vary from $0.10/kWh in Louisiana and Washington to over $0.30/kWh in Hawaii and Connecticut. Check your utility bill for your exact rate.

Power Usage of Common Household Appliances

Heating and cooling are by far the largest residential electricity consumers, accounting for 40-50% of the average US home's energy bill. Water heating is typically second at 15-20%.

Understanding Your Electricity Bill — kWh Calculation Examples

Your electricity bill is measured in kilowatt-hours (kWh). Here's exactly how to read it and calculate costs:

The formula: kWh = Watts ÷ 1,000 × Hours → Cost = kWh × Rate

Real-World kWh Examples

• LED bulb (9W) on for 5 hours = 9 ÷ 1000 × 5 = 0.045 kWh → costs $0.007 at $0.15/kWh
• Laptop (50W) for 8 hours = 50 ÷ 1000 × 8 = 0.4 kWh → costs $0.06 at $0.15/kWh
• Microwave (1,000W) for 6 minutes = 1000 ÷ 1000 × 0.1 = 0.1 kWh → costs $0.015 at $0.15/kWh
• Space heater (1,500W) for 8 hours = 1500 ÷ 1000 × 8 = 12 kWh → costs $1.80/day at $0.15/kWh
• Air conditioner (3,500W) for 8 hours = 3500 ÷ 1000 × 8 = 28 kWh → costs $4.20/day at $0.15/kWh

What's on Your Bill

Your monthly electricity bill includes several components beyond just the energy you use:

• Energy charge: The kWh rate multiplied by your usage. This is the main variable component.
• Demand charge: Common for commercial customers. Based on your peak power demand (highest kilowatt draw at any moment), not total kWh. Running many high-wattage devices simultaneously creates high demand charges.
• Fixed/base customer charge: A flat monthly fee (typically $5-$15) just for being connected to the grid, regardless of usage.
• Distribution and transmission charges: Costs to maintain the power grid and deliver electricity to your home.
• Taxes and fees: State and local taxes, renewable energy programs, low-income assistance programs.

Many utilities use tiered pricing: lower rates for the first tier of usage, higher rates once you exceed that. Some use time-of-use (TOU) rates with lower prices during off-peak hours (nights, weekends) and much higher rates during peak demand (afternoons, hot summer days). With TOU pricing, running your dishwasher and laundry at midnight instead of 6 PM can reduce those appliances' costs by 50%.

How to Reduce Your Electricity Bill

The average US household spends $1,500-$2,500/year on electricity. Here are the highest-impact ways to reduce that:

Heating and Cooling (biggest impact):

• Set thermostat to 68°F in winter, 78°F in summer — each degree of adjustment saves 3% on heating/cooling costs
• Install a programmable or smart thermostat — can save $100-$200/year automatically
• Seal air leaks around windows and doors — can reduce heating/cooling costs 10-20%
• Add insulation to attic — often the highest-ROI home improvement for energy savings
• Clean HVAC filters monthly — dirty filters reduce efficiency and increase energy use

Water Heating:

• Lower water heater temperature to 120°F (factory default is often 140°F) — saves 6-10%
• Fix dripping hot water taps — one drip per second wastes 3,000 gallons/year
• Consider a tankless or heat pump water heater for 30-50% efficiency improvement

Lighting and Electronics:

• Switch all bulbs to LED (uses 75% less energy than incandescent, lasts 25× longer)
• Unplug electronics when not in use — standby power ('vampire power') accounts for 5-10% of home electricity use
• Use smart power strips to cut standby power to entertainment centers and home offices

Renewable Energy Options

Homeowners have increasingly viable options to reduce grid electricity consumption:

Rooftop solar: The average US system (7-10 kW) costs $15,000-$30,000 before incentives and saves $800-$2,000/year on electricity. The federal Investment Tax Credit provides a 30% tax credit on system cost. Payback period is typically 6-10 years; systems last 25-30 years. Net metering programs credit excess solar production to your bill in most states.

Community solar: If rooftop solar isn't feasible, subscribe to a local community solar project. You receive credits on your bill for a share of a larger solar installation, often with no upfront cost and 5-15% savings on electricity costs.

Green power programs: Most utilities offer green pricing programs to purchase renewable energy certificates (RECs). Typically $2-$5/month premium to ensure your electricity comes from renewable sources.

Battery storage: Home batteries (like Tesla Powerwall, ~$12,000 installed) enable storing excess solar, providing backup power, and taking advantage of time-of-use pricing by charging at off-peak rates and discharging during peak hours. Payback periods are currently longer but improving as battery costs decline.

EV Charging Electricity Costs

Electric vehicle charging is an increasingly significant household electricity cost. Key calculations:

Home charging cost: Cost = Battery size (kWh) × Electricity rate ÷ Charging efficiency (typically 85-90%)

For a Tesla Model 3 Long Range (82 kWh battery) at $0.15/kWh:
Full charge cost = 82 × $0.15 ÷ 0.87 = $14.14
Cost per mile (300 mile range): $14.14 ÷ 300 = 4.7 cents/mile

Compare to gasoline: at $3.50/gallon and 30 MPG = 11.7 cents/mile. EVs cost about 60% less per mile to fuel.

Most EV owners do 80-90% of charging at home on Level 2. The average EV adds about $30-$60/month to the electricity bill for a typical driver doing 1,000-1,200 miles/month.

Electricity Costs by Country

Electricity prices vary enormously around the world, driven by energy mix, government subsidies, grid infrastructure costs, and taxation. Understanding where your country falls on the spectrum helps contextualize your electricity spending:

European countries generally have the highest electricity prices due to carbon taxes, renewable energy surcharges, and higher grid infrastructure costs. Countries with abundant hydropower (Canada, Brazil, Norway) tend to have the lowest rates. In the United States, rates range from about $0.10/kWh in states like Louisiana and Idaho to over $0.30/kWh in Hawaii and Connecticut.

When using this calculator, enter your actual electricity rate from your most recent utility bill for the most accurate cost estimates. The default value of $0.12/kWh represents a below-average US rate — many regions are significantly higher.

Smart Home Energy Management

Modern smart home technology offers powerful tools to monitor and reduce electricity consumption in real time. These devices have dropped significantly in price and can deliver measurable savings:

Smart thermostats ($100–$250): Devices like the Nest Learning Thermostat, Ecobee, and Honeywell Home learn your schedule and preferences, automatically adjusting heating and cooling when you are asleep or away. The EPA estimates smart thermostats save an average of $50–$100 per year on heating and cooling — often paying for themselves within 1–2 years. Advanced models include room sensors to avoid heating or cooling unoccupied rooms.

Energy monitors ($30–$300): Whole-home energy monitors like Sense, Emporia Vue, and Neurio clip onto your electrical panel and provide real-time, appliance-level energy usage data via a smartphone app. Knowing exactly which devices consume the most power — and when — enables targeted reductions. Many users report 10–15% electricity savings in the first year simply from increased awareness.

Smart plugs and switches ($10–$30 each): Wi-Fi-enabled plugs from TP-Link, Amazon, and others let you schedule devices on/off, monitor per-device power consumption, and automate standby power elimination. Setting your entertainment center to cut power completely overnight or when you leave the house eliminates vampire loads effortlessly.

Smart LED lighting ($5–$15/bulb): Beyond the 75% energy savings of LED versus incandescent, smart bulbs add scheduling, motion-based automation, dimming, and away-mode simulation. Automated lighting that turns off in unoccupied rooms eliminates one of the most common sources of wasted electricity.

Common Appliance Power Consumption

Reference power usage for household appliances. Actual consumption varies by model, age, and usage patterns.

How Much Does 1 kWh of Electricity Cost?

A kilowatt-hour (kWh) is the standard unit of energy on your electricity bill. The cost of 1 kWh varies by location:

To find your exact rate, look at your electricity bill under "energy charge" or "rate per kWh." Enter that rate in the calculator above for accurate cost estimates.

kWh Cost Reference: Common Usage Amounts

Quick reference for what common amounts of electricity cost at typical rates:

The US average household uses about 886 kWh per month. Use the calculator above to get an exact cost for any appliance or usage amount.

Exact Cost for Small kWh Amounts

Many appliances use less than 1 kWh per hour. Here's exactly what small kWh amounts cost at common rates:

Formula: Cost = kWh × rate. Example: 0.04 kWh at $0.15/kWh = $0.006. Use the calculator above for exact daily, monthly, and yearly projections.