Kilowatt Hour Calculator
body {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
background-color: #f8f9fa;
color: #333;
line-height: 1.6;
margin: 0;
padding: 20px;
display: flex;
justify-content: center;
align-items: flex-start; /* Align to top */
min-height: 100vh;
}
.calculator-container {
background-color: #ffffff;
border-radius: 8px;
box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
overflow: hidden;
width: 100%;
max-width: 700px;
margin: 20px auto;
display: flex;
flex-direction: column;
align-items: center;
padding: 30px 20px;
}
h1 {
color: #004a99;
margin-bottom: 10px;
text-align: center;
}
.description {
font-size: 0.95em;
color: #555;
margin-bottom: 30px;
text-align: center;
max-width: 600px;
}
.input-section {
width: 100%;
margin-bottom: 30px;
padding: 20px;
border: 1px solid #e0e0e0;
border-radius: 5px;
background-color: #fdfdfd;
}
.input-group {
margin-bottom: 20px;
display: flex;
flex-direction: column;
align-items: flex-start;
}
.input-group label {
font-weight: bold;
margin-bottom: 8px;
color: #004a99;
display: block;
}
.input-group input[type="number"],
.input-group input[type="text"] {
width: calc(100% – 22px); /* Adjust for padding */
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 1em;
box-sizing: border-box; /* Include padding and border in the element's total width and height */
}
.input-group input[type="number"]:focus,
.input-group input[type="text"]:focus {
border-color: #004a99;
outline: none;
box-shadow: 0 0 0 2px rgba(0, 74, 153, 0.2);
}
button {
background-color: #28a745;
color: white;
padding: 12px 25px;
border: none;
border-radius: 5px;
font-size: 1.1em;
cursor: pointer;
transition: background-color 0.3s ease;
margin-top: 10px;
width: 100%;
max-width: 200px;
}
button:hover {
background-color: #218838;
}
.result-section {
width: 100%;
margin-top: 20px;
padding: 25px;
background-color: #eef7ff; /* Light blue background for result */
border: 1px solid #cce5ff;
border-radius: 5px;
text-align: center;
box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05);
}
.result-section h2 {
color: #004a99;
margin-bottom: 15px;
font-size: 1.4em;
}
#result {
font-size: 2.2em;
font-weight: bold;
color: #28a745; /* Success green for the result value */
margin-top: 10px;
}
.result-label {
font-size: 0.9em;
color: #555;
margin-top: 5px;
}
.article-section {
width: 100%;
margin-top: 40px;
padding-top: 30px;
border-top: 1px solid #e0e0e0;
text-align: left; /* Align article text left */
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.article-section h2 {
color: #004a99;
margin-bottom: 15px;
text-align: center;
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.article-section p, .article-section ul, .article-section li {
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margin-bottom: 15px;
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.article-section li {
margin-left: 20px;
list-style-type: disc;
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.article-section strong {
color: #004a99;
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/* Responsive adjustments */
@media (max-width: 600px) {
.calculator-container {
padding: 20px 15px;
}
.input-group {
margin-bottom: 15px;
}
button {
padding: 10px 20px;
font-size: 1em;
}
.result-section {
padding: 20px;
}
#result {
font-size: 1.8em;
}
.article-section {
margin-top: 30px;
}
}
Kilowatt Hour (kWh) Calculator
Calculate the energy consumption of an appliance in Kilowatt Hours (kWh). This is useful for understanding electricity usage and estimating costs.
Estimated Monthly Consumption
— kWh
Kilowatt Hours per Month
Understanding Kilowatt Hours (kWh)
A Kilowatt Hour (kWh) is a standard unit of energy. It represents the amount of energy consumed if a device with a power of 1 kilowatt (kW) is used for 1 hour. In simpler terms, it's a measure of how much electricity an appliance uses over time.
Understanding kWh is crucial for managing your household's electricity consumption and costs. Electricity bills are calculated based on the total kWh consumed over a billing period. By calculating the kWh usage of individual appliances, you can identify high-consumption devices and make informed decisions to reduce your energy footprint.
How the Calculation Works:
The formula to calculate energy consumption in kilowatt-hours is straightforward:
- Energy (kWh) = (Power in Watts / 1000) * Time in Hours
Let's break this down:
- Power (Watts): This is the rate at which an appliance consumes energy. You can usually find this information on the appliance's label or in its manual.
- Time (Hours): This is the duration the appliance is in use.
- 1000: We divide the power in Watts by 1000 to convert it into Kilowatts (kW), as 1 kilowatt equals 1000 watts.
This calculator further extends this by estimating monthly usage:
- Monthly kWh = Energy (kWh per use) * Hours per Day * Days per Month
Use Cases for this Calculator:
- Estimating Electricity Bills: By calculating the kWh for all your major appliances and summing them up, you can get a good estimate of your monthly electricity bill, especially when combined with your local electricity rate per kWh.
- Energy Efficiency Comparisons: Use the calculator to compare the energy consumption of different models of appliances before purchasing.
- Identifying Energy Hogs: Pinpoint which appliances consume the most energy in your home and explore ways to reduce their usage or switch to more efficient alternatives.
- Educational Purposes: Understand the energy impact of everyday activities and devices.
Example Calculation:
Let's say you have a:
- Computer that uses 150 Watts and you use it for 6 hours per day.
- You use this computer for 30 days in a month.
Calculation:
- Power in kW = 150 Watts / 1000 = 0.15 kW
- Energy per use = 0.15 kW * 6 hours = 0.9 kWh
- Monthly Energy = 0.9 kWh/day * 30 days = 27 kWh
So, your computer would consume approximately 27 kWh per month.
function calculateKwh() {
var appliancePower = parseFloat(document.getElementById("appliancePower").value);
var usageHours = parseFloat(document.getElementById("usageHours").value);
var daysPerMonth = parseFloat(document.getElementById("daysPerMonth").value);
var resultElement = document.getElementById("result");
// Input validation
if (isNaN(appliancePower) || appliancePower <= 0 ||
isNaN(usageHours) || usageHours <= 0 ||
isNaN(daysPerMonth) || daysPerMonth <= 0) {
resultElement.innerHTML = "Invalid Input";
return;
}
// Convert Watts to Kilowatts
var powerInKw = appliancePower / 1000;
// Calculate energy consumption per use
var energyPerUse = powerInKw * usageHours;
// Calculate total monthly consumption
var monthlyKwh = energyPerUse * daysPerMonth;
// Display the result, rounded to two decimal places
resultElement.innerHTML = monthlyKwh.toFixed(2) + " kWh";
}