Electricity Cost Calculator

Calculate how much an appliance costs to run based on its power consumption and your electricity rate.

Appliance Information

Find this on the appliance label or manual. Typical values: LED bulb 10W, laptop 50W, refrigerator 150W, TV 100W.
Check your electricity bill for your rate. Average US residential rate: $0.16/kWh (2024).

How the Calculation Works

Step 1: Calculate Energy Consumption (kWh)

Energy (kWh) = (Power in Watts × Hours × Days) ÷ 1000

We divide by 1000 because 1 kilowatt (kW) = 1000 watts (W). Electricity bills measure consumption in kilowatt-hours (kWh).

Step 2: Calculate Total Cost

Cost = Energy (kWh) × Price per kWh

Multiply the total energy consumed by your electricity rate to get the total cost.

Example Calculation

Appliance: LED TV (100W), used 5 hours/day for 30 days, electricity rate $0.15/kWh

  • Energy: (100W × 5h × 30d) ÷ 1000 = 15 kWh
  • Cost: 15 kWh × $0.15 = $2.25 for the month

Common Appliance Examples

⚠️ These are typical estimates. Actual power consumption varies by model, age, and settings. Always check your appliance's label or manual for accurate values.