A pro rata calculation is used to determine a proportional amount of something based on a fraction of a whole period or quantity. It's commonly used for things like prepaid expenses, salaries, insurance premiums, or dividends when an event occurs mid-period, requiring an adjustment to reflect the actual time or usage.
.pro-rata-calculator {
font-family: sans-serif;
border: 1px solid #ccc;
padding: 20px;
border-radius: 8px;
max-width: 400px;
margin: 20px auto;
box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.pro-rata-calculator h2 {
text-align: center;
margin-bottom: 20px;
color: #333;
}
.pro-rata-calculator p {
margin-bottom: 20px;
line-height: 1.5;
color: #555;
}
.pro-rata-calculator .inputs {
margin-bottom: 20px;
}
.pro-rata-calculator .form-group {
margin-bottom: 15px;
display: flex;
flex-direction: column;
}
.pro-rata-calculator label {
margin-bottom: 5px;
font-weight: bold;
color: #444;
}
.pro-rata-calculator input[type="number"] {
padding: 10px;
border: 1px solid #ddd;
border-radius: 4px;
box-sizing: border-box; /* Ensures padding doesn't affect width */
}
.pro-rata-calculator button {
width: 100%;
padding: 10px 15px;
background-color: #007bff;
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 16px;
transition: background-color 0.3s ease;
}
.pro-rata-calculator button:hover {
background-color: #0056b3;
}
.pro-rata-calculator .result {
margin-top: 20px;
padding: 15px;
background-color: #e9ecef;
border: 1px solid #ced4da;
border-radius: 4px;
text-align: center;
font-size: 1.1em;
color: #333;
min-height: 20px; /* To ensure it's visible even when empty */
}
function calculateProRata() {
var totalAmount = parseFloat(document.getElementById("totalAmount").value);
var totalPeriod = parseFloat(document.getElementById("totalPeriod").value);
var partialPeriod = parseFloat(document.getElementById("partialPeriod").value);
var resultDiv = document.getElementById("result");
if (isNaN(totalAmount) || isNaN(totalPeriod) || isNaN(partialPeriod)) {
resultDiv.innerHTML = "Please enter valid numbers for all fields.";
return;
}
if (totalPeriod <= 0) {
resultDiv.innerHTML = "Total period must be greater than zero.";
return;
}
if (partialPeriod < 0) {
resultDiv.innerHTML = "Partial period cannot be negative.";
return;
}
// Pro rata formula: (Total Amount / Total Period) * Partial Period
var proRataAmount = (totalAmount / totalPeriod) * partialPeriod;
resultDiv.innerHTML = "Pro Rata Amount: " + proRataAmount.toFixed(2);
}