Everyday Life Tool
Electricity Cost Calculator
Estimate the cost of running any appliance based on wattage and usage.
Appliance Details
US Average is ~$0.13 - $0.16
# About This Calculator
Quick Fact: Did you know many electronics use power even when turned off? This "Phantom Load" (or Vampire Power) can account for up to 10% of your monthly bill!
This calculator helps you convert the cryptic "Watts" on your appliance sticker into actual dollars and cents.
Understanding the Units
- Watts (W): The speed at which power is used right now (like the speedometer in a car).
- Kilowatt-Hours (kWh): The total amount of fuel used over time (like the odometer). This is what you pay for.
Formula: (Watts × Hours) / 1000 = kWh
Then: kWh × Cost Rate = Total Cost
Frequently Asked Questions
How do I calculate the cost of electricity per hour?+
To calculate the cost per hour, find the appliance's wattage, divide by 1000 to get Kilowatts (kW), and multiply by your electricity rate (per kWh). Formula: (Watts / 1000) × Rate.
How much does it cost to run a space heater?+
A standard 1500W space heater costs about $0.20 to $0.25 per hour to run (assuming an average rate of $0.15/kWh). Running it for 8 hours would cost around $1.60 - $2.00.
What is 'Phantom Load'?+
Phantom load is the electricity consumed by devices when they are turned off but plugged in (like TVs in standby mode or phone chargers). It costs the average household $100-$200 per year.
How much power does a light bulb use per day?+
A 100W light bulb running for 10 hours uses 1 kWh. At an average rate of $0.15/kWh, this costs 15 cents per day or about $4.50 per month.
What uses the most electricity in a home?+
Typically, Heating & Cooling (HVAC) is the biggest expense (40-50%), followed by Water Heating (15%) and Appliances (Refrigerators, Dryers) (15%).
Is Electricity Cost Calculator free to use?+
Yes, Electricity Cost Calculator on Matheric is completely free to use. We believe in accessible education and utility for everyone.