Estimate the energy consumption and associated costs of your electrical appliances.
Understanding Power Usage
This calculator helps you understand how much energy your electrical appliances consume and the associated costs. Energy consumption is measured in kilowatt-hours (kWh), which is a standard unit of energy.
The calculation is based on the following principles:
Power Rating: This is the rate at which an appliance consumes energy, typically measured in Watts (W). A higher wattage means the appliance uses more energy per unit of time.
Energy Consumption: To find the total energy consumed by an appliance, we multiply its power rating by the time it is used.
Conversion to Kilowatts: Since electricity is usually billed in kilowatt-hours (kWh), we convert the power rating from Watts to Kilowatts (kW) by dividing by 1000.
Calculation Formula:
Energy (Wh) = Power Rating (W) × Usage Hours (h)
Energy (kWh) = Energy (Wh) / 1000
Total Monthly Energy (kWh) = Energy (kWh) × Days Used Per Month
Monthly Cost = Total Monthly Energy (kWh) × Electricity Cost (per kWh)
By inputting the power rating of an appliance (in Watts), its daily usage hours, the number of days it's used per month, and your local electricity cost per kilowatt-hour, this calculator provides an estimate of your monthly energy expense for that specific device. This information is crucial for identifying energy-hungry appliances and making informed decisions to reduce your electricity bill and carbon footprint.
Use Cases:
Estimating the running cost of household appliances.
Comparing the energy efficiency of different devices.
Budgeting for electricity expenses.
Identifying potential areas for energy savings.
Example:
Let's say you have a Television with a power rating of 100 Watts. You use it for 4 hours per day, 30 days per month. Your electricity costs $0.12 per kWh.
Daily Energy: 100 W * 4 h = 400 Wh
Daily Energy in kWh: 400 Wh / 1000 = 0.4 kWh
Monthly Energy: 0.4 kWh * 30 days = 12 kWh
Monthly Cost: 12 kWh * $0.12/kWh = $1.44
This calculator automates these calculations for you.
function calculatePowerUsage() {
var applianceName = document.getElementById("applianceName").value.trim();
var powerRating = parseFloat(document.getElementById("powerRating").value);
var usageHoursPerDay = parseFloat(document.getElementById("usageHoursPerDay").value);
var daysPerMonth = parseFloat(document.getElementById("daysPerMonth").value);
var electricityCostPerKwh = parseFloat(document.getElementById("electricityCostPerKwh").value);
var resultDiv = document.getElementById("result");
resultDiv.innerHTML = "; // Clear previous results
if (isNaN(powerRating) || powerRating <= 0) {
resultDiv.innerHTML = 'Please enter a valid positive Power Rating.';
return;
}
if (isNaN(usageHoursPerDay) || usageHoursPerDay < 0) {
resultDiv.innerHTML = 'Please enter a valid number of Hours Used Per Day (0 or more).';
return;
}
if (isNaN(daysPerMonth) || daysPerMonth 31) {
resultDiv.innerHTML = 'Please enter a valid number of Days Used Per Month (0-31).';
return;
}
if (isNaN(electricityCostPerKwh) || electricityCostPerKwh < 0) {
resultDiv.innerHTML = 'Please enter a valid non-negative Electricity Cost.';
return;
}
// Calculations
var powerRatingKw = powerRating / 1000; // Convert Watts to Kilowatts
var dailyEnergyKwh = powerRatingKw * usageHoursPerDay;
var monthlyEnergyKwh = dailyEnergyKwh * daysPerMonth;
var monthlyCost = monthlyEnergyKwh * electricityCostPerKwh;
var formattedApplianceName = applianceName ? applianceName : "Appliance";
var resultHTML = "
Estimated Monthly Cost for " + formattedApplianceName + ":