Electricity Cost Calculator Online Free
Electricity Cost Calculator
Appliance Settings
Actual power: 0.00 W
Daily Usage
Monthly Usage
Yearly Usage
Cost Breakdown
Daily Time Distribution
Quick Facts
Power Consumption
Actual Power: 0.00 W
Energy per hour: 0.00 kWh
Daily energy: 0.00 kWh
Cost Breakdown
Cost per hour: $0.00
Weekly cost: $0.00
5-year cost: $0.00
Formula Used
Energy (kWh) = (Power (W) × Hours × Capacity%) / 1000
Cost = Energy (kWh) × Price per kWh
Energy Saving Tips
Monitor your energy habits and turn off unused appliances
Replace incandescent bulbs with LED lights (75W → 9W)
Install programmable thermostats for heating/cooling
Choose energy-efficient appliances when shopping
Improve home insulation (windows, doors, walls)
Use curtains/blinds to reduce heating and cooling needs
The electricity calculator estimates the energy consumption and cost of running any electrical device. Enter the device's wattage, hours per day of use, and your electricity rate to see daily, monthly, and annual costs. Understanding which appliances consume the most energy helps you find savings on your electric bill.
See also:
How to Calculate Electricity Cost
Electricity is billed in kilowatt-hours (kWh). One kWh = using 1,000 watts for 1 hour (or 100 watts for 10 hours). The national average electricity rate is around $0.16/kWh, but rates vary significantly by state and season.
kWh = Watts × Hours / 1,000 Daily Cost = kWh per day × Rate ($/kWh) Monthly Cost = Daily Cost × 30 Annual Cost = Daily Cost × 365
Example: 100W bulb used 8 hours/day at $0.16/kWh. kWh/day = 100×8/1000 = 0.8. Daily cost = $0.13. Monthly = $3.84.
Common Appliance Energy Use
| Appliance | Typical Wattage | Monthly Cost (8 hr/day, $0.16/kWh) |
|---|---|---|
| LED bulb | 10W | $0.38 |
| Laptop | 50W | $1.92 |
| Desktop PC | 200W | $7.68 |
| Refrigerator | 150W (avg) | $5.76 |
| Central AC | 3,500W | $134 |
| Electric water heater | 4,000W (varies) | $154 |
| Clothes dryer | 5,000W | $19.20/load |
Frequently Asked Questions
How do I find the wattage of an appliance?⌄
Check the label on the appliance (usually on the back or bottom). Labels show voltage (V) and amperage (A) or direct wattage (W). If only V and A are shown: Watts = Volts × Amps. In the US, standard household voltage is 120V (some large appliances use 240V). Online appliance databases also list typical wattages.
What uses the most electricity in a home?⌄
Heating and cooling (HVAC) typically accounts for 40-50% of home electricity use. Water heating is second (about 14%). Large appliances (washer, dryer, refrigerator) together account for roughly 13%. Lighting, electronics, and other loads make up the remainder. Reducing HVAC use has by far the largest impact on bills.
What is a kilowatt-hour?⌄
A kilowatt-hour (kWh) is the unit of energy your electric company uses for billing. 1 kWh = 1,000 watts used for 1 hour. Running a 1,000-watt microwave for one hour uses 1 kWh. Running a 100-watt light bulb for 10 hours also uses 1 kWh. Your monthly bill shows how many kWh you consumed multiplied by the rate.
How do I lower my electric bill?⌄
Biggest impacts: adjust your thermostat 1-2 degrees (saves 1-3% per degree), install a programmable thermostat, switch to LED bulbs (use 75-80% less energy than incandescent), wash clothes in cold water, run full loads in the dishwasher and washer, seal air leaks around windows and doors, and unplug electronics drawing standby power. Energy audits from your utility often identify the highest-impact improvements.