Energy Consumption Calculator for Home

How to Use This Calculator

Using the energy consumption calculator is straightforward:

1. Enter the wattage of each appliance you use regularly
2. Specify how many hours each appliance runs per day
3. Select your electricity rate (kWh cost)
4. Click "Calculate" to see your estimated monthly energy costs

The calculator will provide a breakdown of your energy usage and cost, helping you identify which appliances contribute most to your energy bill.

Formula Used

The energy consumption is calculated using the following formula:

Where:

• Wattage = Power rating of the appliance in watts
• Hours per Day = Average daily usage in hours
• Days in Month = Typically 30 days (adjust if needed)
• Electricity Rate = Cost per kilowatt-hour (kWh)

For gas usage, the formula is similar but uses therms or cubic feet as the unit of measure.

Worked Example

Let's calculate the energy cost for a 100-watt light bulb used 5 hours per day with an electricity rate of $0.15 per kWh:

This means using this light bulb for 5 hours each day would cost $2.25 per month.

Interpreting Results

The calculator provides several key pieces of information:

• Total Energy Consumption: The amount of electricity or gas used in kilowatt-hours (kWh) or therms
• Monthly Cost: The estimated cost based on your utility rates
• Appliance Breakdown: Which appliances contribute most to your energy bill

Use this information to:

• Identify energy-saving opportunities
• Compare costs of different appliances
• Plan for energy-efficient upgrades