Written by FreeToolCalc Team
Formulas based on standard financial/medical equations. Last updated: March 2026.
How to Calculate Your Monthly Electricity Bill
Your electricity bill is determined by one simple relationship: the number of kilowatt-hours (kWh) you consume multiplied by your utility's rate per kWh — plus fixed charges, taxes, and fees. The challenge is that most people don't know which appliances are consuming the most energy, making it hard to know where to cut. This calculator breaks it down appliance by appliance.
The average American household uses about 900 kWh per month, at an average cost of around $130–$150. But usage varies enormously: a small apartment might use 400 kWh; a large home with electric heat, a pool, and EV charging could use 3,000+ kWh per month.
The Electricity Cost Formula
Average Electricity Consumption by Appliance
| Appliance | Typical Wattage | Avg. Hours/Day | Monthly kWh | Monthly Cost* |
|---|---|---|---|---|
| Central Air Conditioner | 3,500W | 8 | 840 | $134 |
| Electric Water Heater | 4,000W | 3 | 360 | $58 |
| Electric Dryer | 5,000W | 0.5 | 75 | $12 |
| Refrigerator | 150W | 24 | 108 | $17 |
| Dishwasher | 1,800W | 0.5 | 27 | $4.30 |
| LED TV (55") | 100W | 5 | 15 | $2.40 |
| Desktop Computer | 200W | 6 | 36 | $5.75 |
| LED Bulb | 10W | 5 | 1.5 | $0.24 |
| Phone Charger | 5W | 3 | 0.45 | $0.07 |
*At $0.16/kWh national average rate.
Average Electricity Rates by State (2026)
| State | Avg. Rate (¢/kWh) | Avg. Monthly Bill |
|---|---|---|
| Hawaii | 40¢ | $168 |
| Connecticut | 30¢ | $185 |
| California | 27¢ | $150 |
| Texas | 14¢ | $140 |
| Florida | 14¢ | $138 |
| Washington | 10¢ | $93 |
| Louisiana | 9¢ | $120 |
| National Average | 16¢ | $130 |
Top 10 Ways to Lower Your Electricity Bill
- Install a smart thermostat: Nest or Ecobee can reduce HVAC costs by 10–23%. HVAC is 50–70% of your bill.
- Switch to LED lighting: LEDs use 75% less energy and last 25× longer than incandescent bulbs.
- Seal air leaks: Weather-stripping doors and sealing window gaps reduces HVAC load significantly.
- Use time-of-use (TOU) pricing: Run laundry, dishwasher, and EV charging at night when rates are lower (if your utility offers TOU).
- Unplug vampire loads: Devices on standby consume 5–10% of typical home energy. Use smart power strips.
- Upgrade to ENERGY STAR appliances: When replacing old appliances, choose ENERGY STAR rated — they use 10–50% less energy.
- Wash clothes in cold water: Heating water accounts for ~90% of the energy used by washing machines.
- Air-dry dishes and laundry: Skip the heated dry cycle on your dishwasher; hang clothes when possible.
- Consider solar panels: Depending on location and usage, solar can offset 50–100% of your electricity bill.
- Adjust your refrigerator temperature: Set to 37°F (fridge) and 0°F (freezer) — colder settings waste energy unnecessarily.
⚡ Note
This calculator provides estimates. Actual electricity consumption varies by appliance age, efficiency rating, usage patterns, and local climate. Check your utility's website for your specific rate schedule, including any tiered pricing or time-of-use rates.