Free Electricity Calculator Online
Use this free electricity calculator to estimate the energy consumption and cost of running any appliance. Enter the wattage, daily hours of use, number of days, and your electricity rate to see daily, monthly, and yearly kWh usage and cost breakdowns.
Monthly Cost
Enter appliance details
How the Electricity Calculator Works
The electricity calculator multiplies your appliance wattage by the hours of daily use to get daily watt-hours, then divides by 1,000 to convert to kilowatt-hours (kWh). Multiplying kWh by your utility rate gives the daily electricity cost. The calculator then projects monthly (30 days) and yearly (365 days) estimates.
For example, a 60W LED TV running 5 hours per day at $0.12/kWh consumes 0.3 kWh daily, costing about $0.04/day, $1.08/month, or $13.14/year. The electricity calculator makes these projections instant for any appliance wattage.
Understanding your electricity consumption is the first step to reducing your energy bill. The electricity calculator helps you identify which appliances cost the most and where efficiency upgrades deliver the best return on investment.
Typical Appliance Wattages
Enter these wattages in the electricity calculator to see their cost impact.
3 Ways to Lower Electricity Costs
LED Upgrade
Replacing a 60W incandescent with a 10W LED saves $8/year per bulb at average rates. The electricity calculator shows exactly how much you save.
Smart Thermostat
Reducing HVAC runtime by 2 hours daily on a 3,000W system saves roughly $26/month. Use the electricity calculator to model your specific system.
Off-Peak Usage
If your utility offers time-of-use rates, running the dryer at night vs afternoon can save 30-50% on that appliance. The electricity calculator helps compare rates.
Frequently Asked Questions
Disclaimer: This electricity calculator provides estimates. Actual costs depend on your specific utility rate structure, seasonal pricing, and appliance efficiency. Check your utility bill for your exact rate.
More Science Calculators
Voltage Drop Calculator
Calculate voltage drop across a wire based on length, gauge, and current.
Ohms Law Calculator
Calculate voltage, current, resistance, or power using Ohm's law.
Resistor Calculator
Decode resistor color bands and calculate series/parallel resistance.
Horsepower Calculator
Calculate horsepower from torque and RPM or convert between power units.