.calc-container {
max-width: 800px;
margin: 0 auto;
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
color: #333;
background: #fff;
border: 1px solid #e0e0e0;
border-radius: 8px;
box-shadow: 0 4px 6px rgba(0,0,0,0.05);
padding: 20px;
}
.calc-header {
text-align: center;
margin-bottom: 30px;
background-color: #f7f9fc;
padding: 20px;
border-radius: 8px;
}
.calc-header h2 {
margin: 0;
color: #2c3e50;
}
.calc-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 30px;
}
@media (max-width: 768px) {
.calc-grid {
grid-template-columns: 1fr;
}
}
.input-group {
margin-bottom: 15px;
}
.input-group label {
display: block;
margin-bottom: 5px;
font-weight: 600;
font-size: 0.95rem;
}
.input-wrapper {
position: relative;
display: flex;
align-items: center;
}
.input-prefix, .input-suffix {
background: #f1f1f1;
padding: 10px 12px;
border: 1px solid #ccc;
font-size: 0.9rem;
color: #555;
}
.input-prefix {
border-right: none;
border-radius: 4px 0 0 4px;
}
.input-suffix {
border-left: none;
border-radius: 0 4px 4px 0;
}
.calc-input {
width: 100%;
padding: 10px;
border: 1px solid #ccc;
font-size: 1rem;
outline: none;
transition: border-color 0.2s;
}
.calc-input:focus {
border-color: #3498db;
}
.input-wrapper .calc-input {
border-radius: 0;
}
.calc-btn {
display: block;
width: 100%;
background-color: #3498db;
color: white;
border: none;
padding: 15px;
font-size: 1.1rem;
font-weight: bold;
border-radius: 5px;
cursor: pointer;
margin-top: 20px;
transition: background-color 0.2s;
}
.calc-btn:hover {
background-color: #2980b9;
}
.results-box {
background-color: #f8f9fa;
border: 1px solid #e9ecef;
border-radius: 8px;
padding: 20px;
}
.result-row {
display: flex;
justify-content: space-between;
align-items: center;
padding: 12px 0;
border-bottom: 1px solid #e0e0e0;
}
.result-row:last-child {
border-bottom: none;
}
.result-label {
font-size: 0.95rem;
color: #666;
}
.result-value {
font-weight: bold;
font-size: 1.1rem;
color: #2c3e50;
}
.total-payment {
background-color: #e8f4fd;
padding: 15px;
border-radius: 6px;
margin-top: 10px;
border: 1px solid #bde0fe;
}
.total-payment .result-label {
color: #3498db;
font-weight: 600;
}
.total-payment .result-value {
color: #2980b9;
font-size: 1.4rem;
}
.article-content {
max-width: 800px;
margin: 40px auto;
line-height: 1.6;
color: #444;
}
.article-content h2 {
color: #2c3e50;
margin-top: 30px;
}
.article-content h3 {
color: #34495e;
margin-top: 20px;
}
.article-content ul {
margin-bottom: 20px;
padding-left: 20px;
}
.article-content li {
margin-bottom: 10px;
}
Monthly Breakdown
Principal & Interest
$0.00
Property Tax
$0.00
Home Insurance
$0.00
Total Monthly Payment
$0.00
Loan Summary
Loan Amount
$0.00
Total Interest Paid
$0.00
Total Cost of Loan
$0.00
Understanding Your Mortgage Payment
Taking out a mortgage is one of the biggest financial commitments most people will make in their lifetime. Our Mortgage Payment Calculator helps you understand exactly where your money is going each month. By inputting your home price, down payment, and loan details, you can see a clear breakdown of your estimated monthly costs.
The 4 Pillars of a Mortgage Payment (PITI)
Most monthly mortgage payments consist of four main components, often abbreviated as PITI:
- Principal: This is the portion of your payment that goes towards paying back the actual money you borrowed. In the early years of a loan, this amount is typically small.
- Interest: This is the fee the lender charges you for borrowing the money. At the beginning of a long-term mortgage, the majority of your payment usually goes toward interest.
- Taxes: Real estate property taxes are assessed by local governments. Lenders often collect this monthly and hold it in an escrow account to pay the tax bill when it's due.
- Insurance: Homeowners insurance protects your property against damage. Like taxes, this is often paid monthly into an escrow account.
How Interest Rates Affect Your Buying Power
Even a small change in interest rates can significantly impact your monthly payment and the total cost of your loan. For example, on a $300,000 loan, a 1% increase in interest rate can increase your monthly payment by hundreds of dollars and your total interest paid by tens of thousands over 30 years.
Why Calculate Before You Buy?
Using a mortgage calculator is essential for setting a realistic budget. It allows you to test different scenarios, such as how a larger down payment might lower your monthly costs or how a 15-year term compares to a 30-year term. Remember to factor in maintenance costs and utilities, which are not included in the mortgage payment.
function calculateMortgage() {
// 1. Get Input Values
var priceInput = document.getElementById('homePrice').value;
var downInput = document.getElementById('downPayment').value;
var termInput = document.getElementById('loanTerm').value;
var rateInput = document.getElementById('interestRate').value;
var taxInput = document.getElementById('propertyTax').value;
var insuranceInput = document.getElementById('homeInsurance').value;
// 2. Parse values to numbers
var price = parseFloat(priceInput);
var down = parseFloat(downInput);
var years = parseFloat(termInput);
var annualRate = parseFloat(rateInput);
var annualTax = parseFloat(taxInput);
var annualInsurance = parseFloat(insuranceInput);
// 3. Validation
if (isNaN(price) || price < 0) price = 0;
if (isNaN(down) || down < 0) down = 0;
if (isNaN(years) || years <= 0) years = 30; // Default to 30 if invalid
if (isNaN(annualRate) || annualRate < 0) annualRate = 0;
if (isNaN(annualTax) || annualTax < 0) annualTax = 0;
if (isNaN(annualInsurance) || annualInsurance < 0) annualInsurance = 0;
// 4. Calculate Loan Variables
var principal = price – down;
// Safety check: Principal cannot be negative
if (principal 0) {
monthlyPI = principal / numberOfPayments;
}
} else {
var x = Math.pow(1 + monthlyRate, numberOfPayments);
monthlyPI = (principal * x * monthlyRate) / (x – 1);
}
// 6. Calculate Escrow Items (Tax & Insurance)
var monthlyTax = annualTax / 12;
var monthlyIns = annualInsurance / 12;
// 7. Calculate Totals
var totalMonthlyPayment = monthlyPI + monthlyTax + monthlyIns;
var totalCost = totalMonthlyPayment * numberOfPayments; // This is a rough approximation if taxes/ins stay same
// More accurate Total Loan Cost (Principal + Total Interest)
// Total Interest = (Monthly PI * Months) – Principal
var totalInterest = (monthlyPI * numberOfPayments) – principal;
if (totalInterest < 0) totalInterest = 0;
// Total Cost of Loan usually implies Principal + Interest
var totalLoanCost = principal + totalInterest;
// 8. Update DOM Elements with formatting
function formatMoney(amount) {
return amount.toLocaleString('en-US', { style: 'currency', currency: 'USD', minimumFractionDigits: 2, maximumFractionDigits: 2 });
}
document.getElementById('resPI').innerText = formatMoney(monthlyPI);
document.getElementById('resTax').innerText = formatMoney(monthlyTax);
document.getElementById('resIns').innerText = formatMoney(monthlyIns);
document.getElementById('resTotal').innerText = formatMoney(totalMonthlyPayment);
document.getElementById('resLoanAmount').innerText = formatMoney(principal);
document.getElementById('resTotalInterest').innerText = formatMoney(totalInterest);
document.getElementById('resTotalCost').innerText = formatMoney(totalLoanCost);
}
// Run calculation on load with default values
calculateMortgage();