30 Year Rate Calculator
The 30-year rate calculator helps you understand how the annual interest rate impacts the total cost of a 30-year loan or mortgage. By inputting the loan amount and a range of potential interest rates, you can visualize how much more or less you might pay over the life of the loan.
Calculate Rates
.calculator-wrapper {
font-family: sans-serif;
border: 1px solid #ccc;
padding: 20px;
border-radius: 8px;
max-width: 600px;
margin: 20px auto;
background-color: #f9f9f9;
}
.calculator-wrapper h2 {
text-align: center;
margin-bottom: 15px;
color: #333;
}
.calculator-wrapper p {
text-align: justify;
margin-bottom: 20px;
color: #555;
line-height: 1.5;
}
.calculator-inputs {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
gap: 15px;
margin-bottom: 20px;
}
.form-group {
display: flex;
flex-direction: column;
}
.form-group label {
margin-bottom: 5px;
font-weight: bold;
color: #444;
}
.form-group input[type="number"] {
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 1em;
}
.calculator-wrapper button {
background-color: #4CAF50;
color: white;
padding: 12px 20px;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 1.1em;
width: 100%;
margin-top: 10px;
}
.calculator-wrapper button:hover {
background-color: #45a049;
}
.calculator-result {
margin-top: 20px;
padding: 15px;
border: 1px solid #eee;
background-color: #fff;
border-radius: 4px;
}
.calculator-result h3 {
margin-top: 0;
color: #333;
}
.calculator-result ul {
list-style: none;
padding: 0;
}
.calculator-result li {
margin-bottom: 8px;
color: #555;
}
.calculator-result li strong {
color: #333;
}
var calculate30YearRates = function() {
var loanAmount = parseFloat(document.getElementById("loanAmount").value);
var interestRate1 = parseFloat(document.getElementById("interestRate1").value) / 100;
var interestRate2 = parseFloat(document.getElementById("interestRate2").value) / 100;
var interestRate3 = parseFloat(document.getElementById("interestRate3").value) / 100;
var interestRate4 = parseFloat(document.getElementById("interestRate4").value) / 100;
var interestRate5 = parseFloat(document.getElementById("interestRate5").value) / 100;
var resultDiv = document.getElementById("result");
resultDiv.innerHTML = "";
if (isNaN(loanAmount) || loanAmount <= 0 ||
isNaN(interestRate1) || interestRate1 < 0 ||
isNaN(interestRate2) || interestRate2 < 0 ||
isNaN(interestRate3) || interestRate3 < 0 ||
isNaN(interestRate4) || interestRate4 < 0 ||
isNaN(interestRate5) || interestRate5 < 0) {
resultDiv.innerHTML = "
Please enter valid positive numbers for all fields. ";
return;
}
var rates = [
{ name: "Interest Rate 1", rate: interestRate1, originalPercent: document.getElementById("interestRate1").value },
{ name: "Interest Rate 2", rate: interestRate2, originalPercent: document.getElementById("interestRate2").value },
{ name: "Interest Rate 3", rate: interestRate3, originalPercent: document.getElementById("interestRate3").value },
{ name: "Interest Rate 4", rate: interestRate4, originalPercent: document.getElementById("interestRate4").value },
{ name: "Interest Rate 5", rate: interestRate5, originalPercent: document.getElementById("interestRate5").value }
];
var resultsHtml = "
30-Year Loan Cost Comparison ";
for (var i = 0; i 0) {
monthlyPayment = (loanAmount * (r * Math.pow(1 + r, n))) / (Math.pow(1 + r, n) – 1);
totalCost = monthlyPayment * n;
totalInterestPaid = totalCost – loanAmount;
} else {
monthlyPayment = loanAmount / n;
totalCost = loanAmount;
totalInterestPaid = 0;
}
resultsHtml += "" + rates[i].name + " (" + rates[i].originalPercent + "%) ";
resultsHtml += "Monthly Payment: $" + monthlyPayment.toFixed(2) + "";
resultsHtml += "Total Paid Over 30 Years: $" + totalCost.toFixed(2) + "";
resultsHtml += "Total Interest Paid: $" + totalInterestPaid.toFixed(2) + " ";
resultDiv.innerHTML = resultsHtml;
};