Loan Rate Calculator Excel

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Mortgage Refinance Savings Calculator

Current Monthly Payment (Principal & Interest):
New Monthly Payment:
Monthly Savings:
Break-Even Point:
Total Savings (over life of new loan):

How Does a Mortgage Refinance Calculator Work?

A mortgage refinance calculator helps you determine if switching your current home loan for a new one is financially beneficial. It compares your existing monthly principal and interest payment against the projected payment of a new loan with current market rates. By factoring in closing costs, the calculator identifies your "break-even point"—the exact month where your accumulated savings surpass the upfront cost of refinancing.

When Should You Consider Refinancing?

Most financial experts suggest looking into a refinance if you can lower your interest rate by at least 0.75% to 1%. However, even a smaller reduction can be worth it if you plan to stay in the home for a long duration. Key reasons to refinance include:

  • Lowering Monthly Payments: Directly improving your monthly cash flow.
  • Shortening the Loan Term: Switching from a 30-year to a 15-year mortgage to pay off the debt faster.
  • Switching Loan Types: Moving from an Adjustable-Rate Mortgage (ARM) to a stable Fixed-Rate Mortgage.

Understanding the Break-Even Point

The break-even point is critical. For example, if your refinance costs $5,000 in fees but saves you $200 per month, your break-even point is 25 months ($5,000 / $200). If you plan to sell the house in 2 years (24 months), you would actually lose money by refinancing. If you stay for 10 years, you would save over $19,000 net.

Example Calculation

Imagine you have a $300,000 balance at 6.5% interest. Your payment is roughly $1,896. If you refinance into a new 30-year loan at 4.5%, your new payment drops to $1,520. That is a monthly saving of $376. With closing costs of $5,000, you break even in just over 13 months.

function calculateRefinance() { var balance = parseFloat(document.getElementById('currentBalance').value); var currentRate = parseFloat(document.getElementById('currentRate').value) / 100 / 12; var newRate = parseFloat(document.getElementById('newRate').value) / 100 / 12; var newTermMonths = parseFloat(document.getElementById('newTerm').value) * 12; var costs = parseFloat(document.getElementById('closingCosts').value); if (isNaN(balance) || isNaN(currentRate) || isNaN(newRate) || isNaN(newTermMonths) || isNaN(costs)) { alert("Please enter valid numerical values."); return; } // Current Monthly Payment (Assuming 30 years or similar, we calculate based on current balance for comparison) // Note: For accuracy, we assume the user wants to compare the current balance payment at the old rate vs new rate var oldPmt = balance * (currentRate * Math.pow(1 + currentRate, newTermMonths)) / (Math.pow(1 + currentRate, newTermMonths) – 1); // New Monthly Payment var newPmt = balance * (newRate * Math.pow(1 + newRate, newTermMonths)) / (Math.pow(1 + newRate, newTermMonths) – 1); var monthlySavings = oldPmt – newPmt; var breakEvenMonths = costs / monthlySavings; var totalLifeSavings = (monthlySavings * newTermMonths) – costs; // Display results document.getElementById('results').style.display = 'block'; document.getElementById('oldPayment').innerHTML = '$' + oldPmt.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); document.getElementById('newPayment').innerHTML = '$' + newPmt.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); if (monthlySavings > 0) { document.getElementById('monthlySavings').innerHTML = '$' + monthlySavings.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); document.getElementById('breakEven').innerHTML = Math.ceil(breakEvenMonths) + " Months"; document.getElementById('totalSavings').innerHTML = '$' + totalLifeSavings.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); } else { document.getElementById('monthlySavings').innerHTML = "$0.00"; document.getElementById('monthlySavings').style.color = "red"; document.getElementById('breakEven').innerHTML = "Never"; document.getElementById('totalSavings').innerHTML = "No Savings Possible"; } // Scroll to results document.getElementById('results').scrollIntoView({ behavior: 'smooth', block: 'nearest' }); }

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