This calculator helps you determine the rate of change between two data points, often used in spreadsheet software like Excel to understand how a value changes over time or across different inputs. The rate of change is essentially the slope of the line connecting two points (x1, y1) and (x2, y2) on a graph. It's calculated as the difference in the 'y' values divided by the difference in the 'x' values.
function calculateRateOfChange() {
var x1 = parseFloat(document.getElementById("x1").value);
var y1 = parseFloat(document.getElementById("y1").value);
var x2 = parseFloat(document.getElementById("x2").value);
var y2 = parseFloat(document.getElementById("y2").value);
var resultDiv = document.getElementById("result");
if (isNaN(x1) || isNaN(y1) || isNaN(x2) || isNaN(y2)) {
resultDiv.innerHTML = "Please enter valid numbers for all fields.";
return;
}
var deltaY = y2 – y1;
var deltaX = x2 – x1;
if (deltaX === 0) {
resultDiv.innerHTML = "Cannot calculate rate of change when the change in X is zero (vertical line).";
return;
}
var rateOfChange = deltaY / deltaX;
resultDiv.innerHTML = "The Rate of Change is: " + rateOfChange.toFixed(4);
}
.calculator-container {
font-family: sans-serif;
border: 1px solid #ccc;
padding: 20px;
border-radius: 8px;
max-width: 400px;
margin: 20px auto;
background-color: #f9f9f9;
}
.calculator-container h2 {
text-align: center;
margin-bottom: 15px;
color: #333;
}
.calculator-container p {
margin-bottom: 20px;
line-height: 1.6;
color: #555;
text-align: justify;
}
.input-section {
margin-bottom: 15px;
}
.input-section label {
display: block;
margin-bottom: 5px;
font-weight: bold;
color: #444;
}
.input-section input[type="number"] {
width: calc(100% – 22px);
padding: 10px;
border: 1px solid #ddd;
border-radius: 4px;
box-sizing: border-box;
}
.calculator-container button {
width: 100%;
padding: 12px 15px;
background-color: #5cb85c;
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 16px;
transition: background-color 0.3s ease;
}
.calculator-container button:hover {
background-color: #4cae4c;
}
#result {
margin-top: 25px;
padding: 15px;
background-color: #eef;
border: 1px solid #ddd;
border-radius: 4px;
text-align: center;
font-size: 18px;
font-weight: bold;
color: #333;
}