Calculate your monthly savings and see how long it takes to recover your closing costs.
Current Loan Details
New Refinance Loan
Refinance Analysis
Current Monthly Payment (P&I):$0.00
New Monthly Payment (P&I):$0.00
Monthly Savings:$0.00
Break-Even Point:0 Months
Lifetime Interest Savings:$0.00
Is Refinancing Right for You?
Deciding to refinance your mortgage is a significant financial decision that goes beyond just securing a lower interest rate. While a lower rate is attractive, the upfront costs of refinancing (closing costs) must be weighed against your monthly savings. This Mortgage Refinance Break-Even Calculator helps you determine exactly when your savings will cover the cost of the loan.
Understanding the Break-Even Point
The "break-even point" is the time it takes for your monthly savings to equal the closing costs you paid to get the new loan. For example, if your closing costs are $4,000 and you save $200 per month, your break-even point is 20 months ($4,000 / $200).
Expert Tip: If you plan to move or sell the house before you reach the break-even point, refinancing usually results in a net financial loss, even with a lower interest rate.
Key Factors in the Calculation
Current Balance: The amount currently owed on your home. This will be the principal amount for your new loan (unless you do a "cash-out" refinance).
Interest Rate Differential: The gap between your current rate and the new rate. A general rule of thumb used to be a 1% drop was necessary, but with high loan balances, even 0.5% can generate significant savings.
Loan Term: Switching from a 30-year to a 15-year term often increases monthly payments but drastically reduces total interest paid over the life of the loan.
Closing Costs: These include appraisal fees, origination fees, title insurance, and other administrative costs. They typically range from 2% to 5% of the loan amount.
Short-Term vs. Long-Term Savings
Sometimes, extending your loan term (e.g., refinancing a mortgage with 20 years left back into a new 30-year loan) will lower your monthly payment significantly, but it may increase the total interest you pay over the long run. Use the "Lifetime Interest Savings" metric in the calculator above to ensure you aren't sacrificing long-term wealth for short-term cash flow.
function calculateRefinance() {
// 1. Get Input Values
var balance = parseFloat(document.getElementById('currentBalance').value);
var oldRateInput = parseFloat(document.getElementById('currentRate').value);
var oldYears = parseFloat(document.getElementById('yearsRemaining').value);
var newRateInput = parseFloat(document.getElementById('newRate').value);
var newYears = parseFloat(document.getElementById('newTerm').value);
var closingCosts = parseFloat(document.getElementById('closingCosts').value);
// 2. Validation
if (isNaN(balance) || isNaN(oldRateInput) || isNaN(oldYears) ||
isNaN(newRateInput) || isNaN(newYears) || isNaN(closingCosts)) {
alert("Please fill in all fields with valid numbers.");
return;
}
// 3. Rate Conversions
var oldMonthlyRate = (oldRateInput / 100) / 12;
var newMonthlyRate = (newRateInput / 100) / 12;
var oldMonths = oldYears * 12;
var newMonths = newYears * 12;
// 4. Calculate Payments (Standard Amortization Formula: P = L[c(1+c)^n]/[(1+c)^n – 1])
var oldPayment = 0;
if (oldMonthlyRate === 0) {
oldPayment = balance / oldMonths;
} else {
oldPayment = balance * (oldMonthlyRate * Math.pow(1 + oldMonthlyRate, oldMonths)) / (Math.pow(1 + oldMonthlyRate, oldMonths) – 1);
}
var newPayment = 0;
if (newMonthlyRate === 0) {
newPayment = balance / newMonths; // Assuming costs are paid upfront, not rolled in
} else {
newPayment = balance * (newMonthlyRate * Math.pow(1 + newMonthlyRate, newMonths)) / (Math.pow(1 + newMonthlyRate, newMonths) – 1);
}
// 5. Calculate Metrics
var monthlySavings = oldPayment – newPayment;
var breakEvenMonths = 0;
// Handle negative savings (refi costs more per month)
if (monthlySavings > 0) {
breakEvenMonths = closingCosts / monthlySavings;
} else {
breakEvenMonths = -1; // Flag for "Never"
}
// Lifetime calculations
var totalCostOld = (oldPayment * oldMonths);
var totalCostNew = (newPayment * newMonths) + closingCosts;
var lifetimeSavings = totalCostOld – totalCostNew;
// 6. Display Results
document.getElementById('results').style.display = 'block';
// Helper for currency formatting
var fmt = new Intl.NumberFormat('en-US', { style: 'currency', currency: 'USD' });
document.getElementById('resCurrentPayment').innerHTML = fmt.format(oldPayment);
document.getElementById('resNewPayment').innerHTML = fmt.format(newPayment);
var saveElem = document.getElementById('resMonthlySavings');
if (monthlySavings >= 0) {
saveElem.innerHTML = fmt.format(monthlySavings);
saveElem.style.color = "#27ae60";
} else {
saveElem.innerHTML = "-" + fmt.format(Math.abs(monthlySavings));
saveElem.style.color = "#e74c3c";
}
var breakElem = document.getElementById('resBreakEven');
var analysis = document.getElementById('analysisText');
if (breakEvenMonths === -1) {
breakElem.innerHTML = "Never";
breakElem.className = "result-value bad-result";
analysis.innerHTML = "Your monthly payment would increase. Refinancing may not be beneficial unless you are switching from an ARM to a fixed rate or need cash out.";
} else {
// Convert months to Years/Months for readability if > 12
if (breakEvenMonths > 12) {
var y = Math.floor(breakEvenMonths / 12);
var m = Math.round(breakEvenMonths % 12);
breakElem.innerHTML = y + " Years, " + m + " Months";
} else {
breakElem.innerHTML = Math.ceil(breakEvenMonths) + " Months";
}
breakElem.className = "result-value highlight-result";
if (lifetimeSavings > 0) {
analysis.innerHTML = "Great news! You will recoup your closing costs in " + Math.ceil(breakEvenMonths) + " months and save significantly over the life of the loan.";
} else {
analysis.innerHTML = "While you save monthly, the extended term means you pay more interest overall. Ensure this aligns with your long-term goals.";
}
}
var lifeElem = document.getElementById('resLifetimeSavings');
if (lifetimeSavings >= 0) {
lifeElem.innerHTML = fmt.format(lifetimeSavings);
lifeElem.style.color = "#2c3e50";
} else {
lifeElem.innerHTML = "-" + fmt.format(Math.abs(lifetimeSavings));
lifeElem.style.color = "#e74c3c";
}
}