This calculator helps you estimate the cost of running an electrical device based on its power consumption, usage time, and the price of electricity in your area. Understanding your consumption can lead to significant savings on your electricity bills and a more environmentally conscious approach to energy use.
How it Works:
The calculation involves several steps to convert the device's power rating into a cost over time. The core principles are:
Power to Energy Conversion: Electrical devices consume energy. Power is measured in Watts (W), and energy is typically measured in Kilowatt-hours (kWh). One kWh is equivalent to using 1000 Watts of power for one hour.
Daily Usage Calculation: We first determine the total energy consumed by the device in a day.
Total Watts used per day = Device Power (Watts) × Hours Used Per Day
Total Kilowatt-hours used per day = (Total Watts used per day / 1000)
Weekly Usage Calculation: To provide a more comprehensive view, we can extend this to weekly usage.
Total Kilowatt-hours used per week = Total Kilowatt-hours used per day × Days Used Per Week
Cost Calculation: Finally, the energy consumption is multiplied by the cost of electricity per kWh to determine the expense.
Estimated Daily Cost = Total Kilowatt-hours used per day × Electricity Cost (per kWh)
Estimated Weekly Cost = Total Kilowatt-hours used per week × Electricity Cost (per kWh)
Example Calculation:
Let's consider a common household example:
A television set that consumes 150 Watts.
It is used for 5 hours each day.
Used 7 days a week.
The electricity rate is $0.12 per kWh.
Step 1: Watts per day
150 Watts × 5 hours = 750 Watts-hours
Step 2: Kilowatt-hours per day
750 Watts-hours / 1000 = 0.75 kWh
Step 3: Kilowatt-hours per week
0.75 kWh/day × 7 days = 5.25 kWh/week
Step 4: Daily Cost
0.75 kWh × $0.12/kWh = $0.09 per day
This means running the TV for 5 hours a day would cost approximately $0.09 daily or $0.63 weekly. By using this calculator, you can identify high-consumption devices and explore ways to reduce usage or switch to more energy-efficient alternatives.
Why Use This Calculator?
Budgeting: Estimate and manage your household electricity expenses.
Energy Efficiency: Identify which appliances consume the most energy.
Cost Savings: Make informed decisions about appliance usage and potential upgrades.
Environmental Impact: Understand your carbon footprint related to electricity consumption.
function calculateConsumption() {
var devicePower = parseFloat(document.getElementById("devicePower").value);
var hoursPerDay = parseFloat(document.getElementById("hoursPerDay").value);
var daysPerWeek = parseFloat(document.getElementById("daysPerWeek").value);
var electricityCostPerKwh = parseFloat(document.getElementById("electricityCostPerKwh").value);
var resultDiv = document.getElementById("result");
// Input validation
if (isNaN(devicePower) || devicePower <= 0) {
resultDiv.innerHTML = "Please enter a valid device power (Watts).";
return;
}
if (isNaN(hoursPerDay) || hoursPerDay < 0) {
resultDiv.innerHTML = "Please enter a valid number of hours per day.";
return;
}
if (isNaN(daysPerWeek) || daysPerWeek 7) {
resultDiv.innerHTML = "Please enter a valid number of days per week (1-7).";
return;
}
if (isNaN(electricityCostPerKwh) || electricityCostPerKwh < 0) {
resultDiv.innerHTML = "Please enter a valid electricity cost per kWh.";
return;
}
// Calculations
var totalWattsPerDay = devicePower * hoursPerDay;
var totalKwhPerDay = totalWattsPerDay / 1000;
var totalKwhPerWeek = totalKwhPerDay * daysPerWeek;
var dailyCost = totalKwhPerDay * electricityCostPerKwh;
var weeklyCost = totalKwhPerWeek * electricityCostPerKwh;
// Formatting result to display currency correctly
var formattedDailyCost = dailyCost.toFixed(2);
var formattedWeeklyCost = weeklyCost.toFixed(2);
resultDiv.innerHTML = "Estimated Daily Cost: $" + formattedDailyCost + "" +
"Estimated Weekly Cost: $" + formattedWeeklyCost + "";
}