Electricity Calculator

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Electricity Usage & Cost Calculator

Estimated Consumption Results

Daily Consumption: 0 kWh

Monthly Consumption: 0 kWh

Daily Cost: $0.00

Monthly Cost: $0.00

Estimated Annual Cost: $0.00

function calculateElectricity() { var watts = parseFloat(document.getElementById('applianceWatts').value); var hours = parseFloat(document.getElementById('hoursPerDay').value); var costKWh = parseFloat(document.getElementById('costPerKWh').value); var resultDiv = document.getElementById('electricityResult'); if (isNaN(watts) || isNaN(hours) || isNaN(costKWh) || watts < 0 || hours < 0 || costKWh 24) { alert("Hours per day cannot exceed 24."); return; } var dailyKWh = (watts * hours) / 1000; var monthlyKWh = dailyKWh * 30.44; // Average days in month var dailyCost = dailyKWh * costKWh; var monthlyCost = monthlyKWh * costKWh; var yearlyCost = monthlyCost * 12; document.getElementById('dailyKWh').innerText = dailyKWh.toFixed(2); document.getElementById('monthlyKWh').innerText = monthlyKWh.toFixed(2); document.getElementById('dailyCost').innerText = dailyCost.toFixed(2); document.getElementById('monthlyCost').innerText = monthlyCost.toFixed(2); document.getElementById('yearlyCost').innerText = yearlyCost.toFixed(2); resultDiv.style.display = 'block'; }

How to Calculate Appliance Electricity Costs

Understanding the energy consumption of your household appliances is the first step toward reducing your monthly utility bills. This calculator helps you determine how much specific devices—like air conditioners, space heaters, or gaming PCs—are adding to your expenses.

The Electricity Calculation Formula

To calculate the energy used by any electrical device, you use the following physical formula:

  • Step 1: Find the Wattage (W) on the device label.
  • Step 2: Multiply Watts by Hours of use per day.
  • Step 3: Divide by 1,000 to convert to Kilowatt-hours (kWh).
  • Step 4: Multiply kWh by your local utility rate (Cost per kWh).

Typical Power Ratings for Common Appliances

Appliance Typical Wattage
Central Air Conditioner3000W – 5000W
Electric Clothes Dryer2000W – 4000W
Refrigerator (Modern)100W – 250W
Laptop Computer50W – 100W
LED Light Bulb8W – 12W

Realistic Example Calculation

Imagine you use a 1500W space heater for 8 hours a day during winter. If your electricity rate is $0.15 per kWh:

1. Daily Energy: (1500 Watts × 8 Hours) / 1000 = 12 kWh/day.
2. Daily Cost: 12 kWh × $0.15 = $1.80 per day.
3. Monthly Cost: $1.80 × 30 days = $54.00 per month.

Tips to Lower Your Electricity Bill

If your calculation shows a high monthly cost, consider these energy-saving strategies:

  1. Switch to LED: Replacing incandescent bulbs with LEDs can reduce lighting energy usage by up to 80%.
  2. Unplug "Phantom" Loads: Electronics like TVs and chargers draw power even when turned off. Use smart power strips to cut power completely.
  3. Maintain HVAC: Cleaning air filters and sealing duct leaks allows your heating and cooling systems to run more efficiently.
  4. Use Appliances During Off-Peak: If your utility offers "Time-of-Use" rates, running heavy appliances at night can be significantly cheaper.

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