Cost Calculator AI
Home & LivingUS Grid Average Data

Electricity Cost Calculator

Calculate residential and commercial electricity expenses per hour, day, month, or year by kWh consumption or appliance wattage.

Electricity Inputs

1.50 kW
Watts (W)
6.0 hrs/day
Currency:
US National Avg: $0.168
$
/ kWh
Quick rates:
Popular US Household Appliance Presets:
Estimated Utility Cost
Monthly Electricity Cost
$46.01

Consumes approx 274 kWh / month

Cost per Hour$0.06
Cost per Day (24 hrs)$1.51
Monthly Projection (avg 30.4 days)$46.01
Annual Projected Total$552.12
US Grid Carbon ImpactEPA Estimate
~2,809 lbs COโ‚‚ emissions / year

Based on US national average grid generation intensity (0.855 lbs COโ‚‚/kWh).

Note: Utility bills often include fixed customer charges, taxes, and demand tiers that may slightly modify your net bill.

Electricity Cost Formula

Cost ($) = (Wattage ร— Hours Used / 1,000) ร— Electricity Rate ($/kWh)
  • Wattage (W): Power rating of the electrical appliance.
  • Kilowatt-hours (kWh): Electrical energy measurement equal to 1,000 watts sustained for one hour.
  • Electricity Rate ($/kWh): The blended rate charged by your local utility provider (US average is ~ $0.165 - $0.17 per kWh).

Step-by-Step Worked Example

Scenario: Running a 1,500W space heater in winter

Calculation Steps:

  1. Daily Consumption = (1,500W ร— 6 hours) / 1,000 = 9.0 kWh per day
  2. Daily Cost = 9.0 kWh ร— $0.17 = $1.53 per day
  3. Monthly Cost (30 days) = 9.0 kWh ร— 30 days ร— $0.17 = $45.90 per month
Result: Operating the heater costs $1.53 per day and approximately $45.90 each billing cycle.

How to Use This Calculator

  1. 1Choose whether to calculate by direct kWh consumption from your electric bill or by individual appliance wattage.
  2. 2Enter the power rating (Watts) and how many hours per day you run the device.
  3. 3Verify or update the electricity rate ($/kWh) to match your local utility bill statement.
  4. 4Inspect the instant breakdown to view hourly, daily, monthly, and annual utility costs.

Assumptions & Limitations

  • Assumes steady-state electricity consumption when the device is actively running.
  • Uses the US national average utility rate of $0.165/kWh as a default, which varies by state from $0.11/kWh (e.g. Washington) to $0.35+/kWh (e.g. California, Hawaii).
  • Carbon footprint estimate is based on the US EPA national grid average of 0.855 lbs CO2 equivalent per kWh.

Frequently Asked Questions

Where can I find my electricity rate per kWh?

Check your electric utility bill statement under the "Supply" or "Generation" and "Transmission & Distribution" sections. Divide your total bill amount by the total kWh consumed for your all-in effective rate.

Which home appliances use the most electricity?

Central air conditioning, heat pumps, electric water heaters, clothes dryers, and space heaters consume the largest share of household electricity.

How do I convert watts to kilowatt-hours?

Multiply wattage by operating hours, then divide by 1,000. For example: 100 watts running for 10 hours = 1,000 watt-hours = 1 kWh.

Related Cost Calculators

Home & LivingInteractive

Cooling Cost Calculator

Calculate air conditioner and central AC electricity costs from wattage or BTU/h cooling capacity and SEER efficiency.

Open Calculator
Home & LivingInteractive

Home Utility Cost Calculator

Combine electricity, water, natural gas, internet, and trash bills with billing frequency normalization into one monthly budget.

Open CalculatorPopular
Home & LivingInteractive

Appliance Running Cost Calculator

Calculate how much any household appliance costs to run per day, month, and year based on wattage and operating hours.

Open Calculator