How to Calculate Mortgage Payoff Amount

Mortgage Payoff Amount Calculator & Guide :root { –primary-color: #004a99; –success-color: #28a745; –background-color: #f8f9fa; –text-color: #333; –border-color: #ccc; –card-background: #fff; –shadow: 0 2px 4px rgba(0,0,0,.1); } body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background-color: var(–background-color); color: var(–text-color); line-height: 1.6; margin: 0; padding: 0; } .container { max-width: 1000px; margin: 20px auto; padding: 20px; background-color: var(–card-background); border-radius: 8px; box-shadow: var(–shadow); } h1, h2, h3 { color: var(–primary-color); } h1 { text-align: center; margin-bottom: 20px; } .loan-calc-container { background-color: var(–card-background); padding: 25px; border-radius: 8px; box-shadow: var(–shadow); margin-bottom: 30px; } .loan-calc-container h2 { text-align: center; margin-bottom: 25px; color: var(–primary-color); } .input-group { margin-bottom: 15px; display: flex; flex-direction: column; } .input-group label { display: block; margin-bottom: 5px; font-weight: bold; } .input-group input[type="number"], .input-group input[type="text"], .input-group select { width: 100%; padding: 10px; border: 1px solid var(–border-color); border-radius: 4px; box-sizing: border-box; font-size: 1rem; } .input-group .helper-text { font-size: 0.85rem; color: #6c757d; margin-top: 5px; } .error-message { color: #dc3545; font-size: 0.9rem; margin-top: 5px; display: none; /* Hidden by default */ } .button-group { display: flex; justify-content: space-between; margin-top: 20px; gap: 10px; } .button-group button { flex: 1; padding: 10px 15px; border: none; border-radius: 4px; cursor: pointer; font-size: 1rem; transition: background-color 0.3s ease; color: white; } .btn-calculate { background-color: var(–primary-color); } .btn-calculate:hover { background-color: #003366; } .btn-reset { background-color: #6c757d; } .btn-reset:hover { background-color: #5a6268; } .btn-copy { background-color: #17a2b8; } .btn-copy:hover { background-color: #138496; } #results-container { margin-top: 30px; padding: 20px; border: 1px solid var(–border-color); border-radius: 8px; background-color: var(–card-background); box-shadow: var(–shadow); } #results-container h3 { margin-top: 0; color: var(–primary-color); text-align: center; } .primary-result { font-size: 2.2rem; font-weight: bold; color: var(–success-color); text-align: center; margin: 15px 0; padding: 10px; background-color: #e9ecef; border-radius: 5px; } .intermediate-results div, .assumptions div { margin-bottom: 10px; font-size: 1.1rem; display: flex; justify-content: space-between; padding: 5px 0; } .intermediate-results span:first-child, .assumptions span:first-child { font-weight: bold; } .formula-explanation { font-size: 0.95rem; color: #555; margin-top: 15px; padding-top: 15px; border-top: 1px dashed var(–border-color); } table { width: 100%; border-collapse: collapse; margin-top: 20px; margin-bottom: 30px; } th, td { padding: 10px; text-align: left; border: 1px solid var(–border-color); } th { background-color: #e9ecef; color: var(–primary-color); font-weight: bold; } tr:nth-child(even) { background-color: #f2f2f2; } caption { font-style: italic; color: #6c757d; margin-bottom: 10px; text-align: left; font-size: 0.95rem; } canvas { display: block; margin: 20px auto; max-width: 100%; border: 1px solid var(–border-color); border-radius: 4px; } .article-section { margin-top: 40px; margin-bottom: 40px; } .article-section h2 { margin-bottom: 15px; border-bottom: 2px solid var(–primary-color); padding-bottom: 5px; } .article-section h3 { margin-top: 25px; margin-bottom: 10px; color: #0056b3; } .article-section p, .article-section ul, .article-section ol { margin-bottom: 15px; color: #333; } .article-section ul, .article-section ol { padding-left: 25px; } .article-section li { margin-bottom: 8px; } .faq-item { margin-bottom: 15px; border-left: 3px solid var(–primary-color); padding-left: 15px; background-color: #fdfdfd; padding-top: 5px; padding-bottom: 5px; } .faq-item h3 { margin-bottom: 5px; font-size: 1.1rem; color: var(–primary-color); } .faq-item p { margin-bottom: 0; font-size: 0.95rem; } .internal-links { margin-top: 30px; padding: 20px; background-color: #e9ecef; border-radius: 5px; } .internal-links h3 { margin-top: 0; color: var(–primary-color); text-align: center; margin-bottom: 15px; } .internal-links ul { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; justify-content: center; gap: 15px; } .internal-links li { margin-bottom: 10px; } .internal-links a { color: var(–primary-color); text-decoration: none; font-weight: bold; } .internal-links a:hover { text-decoration: underline; } .internal-links span { display: block; font-size: 0.9rem; color: #555; margin-top: 3px; } .primary-result-label { font-size: 1.2rem; font-weight: bold; color: var(–primary-color); text-align: center; display: block; margin-bottom: 5px; }

Mortgage Payoff Amount Calculator

Calculate your mortgage payoff amount easily and understand the key figures involved. This tool helps you determine the exact balance you need to pay to be mortgage-free.

Calculate Your Mortgage Payoff

Calculation Results

Estimated Payoff Amount: $0.00

Key Figures:

Total Principal Paid (with prepayments): $0.00
Total Interest Paid (with prepayments): $0.00
Total Paid Over Life of Loan (with prepayments): $0.00

Key Assumptions:

Remaining Loan Term: 0 months
Annual Interest Rate: 0.00%
Extra Principal Payments: $0.00 / month
Formula Explanation: The payoff amount is essentially the current remaining balance. However, this calculator projects how extra principal payments and the remaining interest will affect the total amount paid and the time to payoff. It calculates the future value of the remaining loan payments considering the specified extra principal.

What is Mortgage Payoff Amount?

{primary_keyword} refers to the precise sum of money required to fully settle your outstanding mortgage debt. It's not just the remaining principal balance; it also includes any accrued interest, potential fees for early payoff, and any other charges that the lender might add. Understanding your mortgage payoff amount is crucial for homeowners looking to sell their property, refinance their loan, or simply accelerate their debt repayment to become mortgage-free sooner. It provides a clear financial target for a complete debt discharge.

Who should use it? Anyone who is considering selling their home, planning to refinance their mortgage, or aims to pay off their mortgage ahead of schedule should understand their mortgage payoff amount. It's also important for estate planning or for individuals wanting a clear financial picture of their total debt obligation.

Common misconceptions include thinking the payoff amount is simply the stated remaining principal balance. Many people overlook accrued interest, potential prepayment penalties (though less common now due to regulations like the Dodd-Frank Act), and other servicing fees. The actual amount due on a specific date can fluctuate slightly based on when payments are processed.

Mortgage Payoff Amount Formula and Mathematical Explanation

Calculating the exact mortgage payoff amount involves projecting the loan's amortization schedule forward to a specific point in time, typically the date of the intended payoff. The core concept relies on determining the present value of remaining cash flows (future payments) that would be needed to satisfy the loan.

However, for practical purposes and for tools like this calculator, we often simplify the "payoff amount" calculation to represent the current remaining balance plus any interest accrued up to a certain point, and then simulate how extra principal payments would affect the time and total cost.

The calculator above uses a standard loan amortization formula iteratively. For each month, it:

  1. Calculates the standard monthly interest based on the current balance and the monthly interest rate (Annual Rate / 12).
  2. Determines the total monthly payment required to amortize the loan over the original term (or remaining term if known precisely). This often involves the loan payment formula: M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1], where M is monthly payment, P is principal, i is monthly interest rate, and n is number of months.
  3. Applies the extra principal payment provided by the user to the current balance after the standard principal portion of the payment is accounted for.
  4. Updates the balance and recalculates interest for the next month.

The final payoff amount displayed is the remaining principal balance after all scheduled payments plus any extra principal payments have been made, assuming the loan is paid off at the end of the calculated term (or accelerated term due to extra payments). It effectively shows what the balance would be if you were to make those specific extra payments throughout the remaining term.

Variables Explanation:

Mortgage Payoff Calculator Variables
Variable Meaning Unit Typical Range
Current Mortgage Balance The outstanding principal amount owed on the mortgage. Currency (e.g., USD) $50,000 – $1,000,000+
Extra Principal Payments (Monthly) Additional amount paid towards the principal each month, above the scheduled principal payment. Currency (e.g., USD) $0 – $1,000+
Months Left on Loan The original number of months remaining until the mortgage is fully paid off. Months 1 – 360
Annual Interest Rate (%) The yearly interest rate charged by the lender. Percentage (%) 1% – 10%+

Practical Examples (Real-World Use Cases)

Let's explore how different scenarios impact your mortgage payoff amount and timeline.

Example 1: Accelerating Payoff with Extra Payments

Scenario: Sarah has a mortgage with a remaining balance of $200,000, 15 years (180 months) left, and an annual interest rate of 4.0%. She decides to make an extra $300 principal payment each month.

Inputs:

  • Current Mortgage Balance: $200,000
  • Months Left on Loan: 180
  • Annual Interest Rate (%): 4.0
  • Extra Principal Payments (Monthly): $300

Calculation Results (Simulated):

Using the calculator, Sarah would find:

  • Estimated Payoff Amount: ~$239,450 (This represents the total principal and interest paid over the accelerated term)
  • Total Principal Paid (with prepayments): ~$200,000
  • Total Interest Paid (with prepayments): ~$39,450
  • Total Paid Over Life of Loan (with prepayments): ~$239,450
  • (Note: The calculator also implicitly shows that she would pay off her loan significantly faster than 15 years.)

Financial Interpretation: By consistently adding $300 per month, Sarah pays off her mortgage potentially years earlier and saves a substantial amount in interest compared to making only the minimum payments. The calculator helps quantify this saving and project the final payout.

Example 2: Standard Payoff Calculation

Scenario: John has a mortgage with a remaining balance of $150,000, 10 years (120 months) left, and an annual interest rate of 5.5%. He plans to make only the standard payments.

Inputs:

  • Current Mortgage Balance: $150,000
  • Months Left on Loan: 120
  • Annual Interest Rate (%): 5.5
  • Extra Principal Payments (Monthly): $0

Calculation Results (Simulated):

Using the calculator with $0 extra payments:

  • Estimated Payoff Amount: ~$181,000 (Total principal and interest paid over the remaining 10 years)
  • Total Principal Paid (with prepayments): ~$150,000
  • Total Interest Paid (with prepayments): ~$31,000
  • Total Paid Over Life of Loan (with prepayments): ~$181,000

Financial Interpretation: This shows John the total amount he will pay for his mortgage if he sticks to the original schedule. It serves as a baseline to compare against scenarios where he might decide to make extra payments.

How to Use This Mortgage Payoff Calculator

Using this mortgage payoff calculator is straightforward. Follow these steps to get an accurate estimate:

  1. Enter Current Mortgage Balance: Input the exact outstanding principal amount you currently owe on your mortgage. Check your latest mortgage statement for this figure.
  2. Enter Extra Principal Payments (Monthly): If you plan to make additional payments specifically towards the principal each month, enter that amount here. If you plan to only make standard payments, enter $0.
  3. Enter Months Left on Loan: Specify the total number of months remaining until your mortgage is scheduled to be fully paid off according to your original loan agreement.
  4. Enter Annual Interest Rate (%): Input the annual interest rate of your mortgage loan. Ensure you are using the correct rate as per your loan documents.
  5. Click 'Calculate Payoff': Once all fields are filled, click the button. The calculator will instantly update with the projected payoff amount and key figures.

How to Read Results:

  • Estimated Payoff Amount: This is the main figure. It represents the total amount you'd pay (principal + interest) if you followed the payment plan including extra principal payments, culminating in the loan's full repayment.
  • Total Principal Paid: This confirms the original principal balance plus any extra principal applied.
  • Total Interest Paid: Shows the projected interest costs under the given scenario. Notice how this decreases with higher extra principal payments.
  • Total Paid Over Life of Loan: The sum of Total Principal Paid and Total Interest Paid.
  • Key Assumptions: Double-check these to ensure they align with your inputs.

Decision-Making Guidance:

Use the results to decide if accelerating your mortgage payoff is feasible and beneficial. Compare the "Total Interest Paid" with and without extra payments to see potential savings. If you're considering selling, the payoff amount helps determine your equity.

Key Factors That Affect Mortgage Payoff Results

Several factors can influence your mortgage payoff amount and the time it takes to achieve it. Understanding these helps in financial planning:

  1. Interest Rate:

    A higher interest rate means more of your payment goes towards interest, increasing the total payoff amount and extending the payoff timeline if only minimum payments are made. Conversely, a lower rate accelerates payoff and reduces total interest paid.

  2. Remaining Loan Term:

    The longer the remaining term, the more interest you will accrue over time. A shorter term naturally leads to a quicker payoff and less total interest, assuming consistent payment amounts.

  3. Extra Principal Payments:

    This is one of the most effective ways to accelerate payoff. Every extra dollar paid directly reduces the principal balance, thereby reducing future interest calculations and shortening the loan's life. Use our mortgage payoff calculator to see the impact.

  4. Lender Fees and Charges:

    While less common due to regulations, some loans might have prepayment penalties or other administrative fees. These would increase the final payoff amount. Always review your loan agreement.

  5. Payment Timing and Application:

    Ensure your lender applies extra payments directly to the principal. Payments made late in the billing cycle might accrue more interest before being applied. Timely payments are crucial.

  6. Escrow Account Fluctuation:

    Your monthly mortgage payment often includes funds for property taxes and insurance (escrow). If these costs rise, your total monthly payment might increase, potentially affecting your ability to make extra principal payments. While not directly part of the payoff calculation, it impacts overall affordability.

  7. Inflation and Opportunity Cost:

    Consider the 'opportunity cost' of putting extra money towards your mortgage. Could that money earn a higher return invested elsewhere? Inflation also erodes the purchasing power of future dollars, making future payments less burdensome in real terms.

Frequently Asked Questions (FAQ)

Q1: What is the difference between the remaining balance and the payoff amount?

The remaining balance is the principal amount currently owed. The payoff amount is the exact figure needed to close the loan, which includes the remaining balance plus any accrued interest up to the payoff date, and potentially fees. This calculator focuses on projecting the future balance considering payments.

Q2: Are there prepayment penalties?

Many modern mortgages, especially conforming loans in the US, do not have prepayment penalties. However, it's essential to check your specific loan documents. Some non-conforming or specialized loans might still include them.

Q3: How often should I make extra principal payments?

You can make extra principal payments as frequently as you like – weekly, bi-weekly, monthly, or as a lump sum. The key is consistency. Even small, regular extra payments can significantly shorten your loan term.

Q4: Does an extra principal payment reduce my next regular payment?

No, an extra principal payment reduces the loan balance, which in turn reduces the amount of interest you'll pay over the life of the loan. Your next regular mortgage payment amount (principal + interest) will remain the same until your loan term is complete, but you'll pay off the loan faster.

Q5: Can I use this calculator if my loan is interest-only?

This calculator is designed for amortizing loans. If you have an interest-only period, the calculation logic for the payoff amount differs significantly as principal is not being paid down during that phase. You would need a specialized calculator for interest-only loans.

Q6: What if my interest rate changes (Adjustable-Rate Mortgage)?

This calculator assumes a fixed interest rate for the remaining term. If you have an ARM, the payoff amount will fluctuate based on future rate adjustments. You would need to recalculate periodically or use a more advanced ARM calculator.

Q7: How do I find my exact current mortgage balance?

Your most recent mortgage statement will clearly show your outstanding principal balance. You can also often find this information by logging into your lender's online portal.

Q8: How does paying off a mortgage early affect my credit score?

Paying off a mortgage early is generally positive. It reduces your debt load and demonstrates financial responsibility. While closing an account might slightly affect your credit utilization ratio initially, the long-term benefit of being debt-free outweighs any minor short-term impacts.

Related Tools and Internal Resources

Loan Amortization Chart

function drawChart(initialBalance, interestRate, remainingMonths, extraPayments) { var ctx = document.getElementById('amortizationChart').getContext('2d'); var chartData = { labels: [], datasets: [{ label: 'Principal Balance', data: [], borderColor: 'var(–primary-color)', backgroundColor: 'rgba(0, 74, 153, 0.1)', fill: false, tension: 0.1 }, { label: 'Balance with Extra Payments', data: [], borderColor: 'var(–success-color)', backgroundColor: 'rgba(40, 167, 69, 0.1)', fill: false, tension: 0.1 }] }; var monthlyInterestRate = interestRate / 100 / 12; var balance = initialBalance; var balanceWithExtra = initialBalance; var payment = calculateMonthlyPayment(initialBalance, monthlyInterestRate, remainingMonths); var totalInterestPaid = 0; var totalInterestPaidWithExtra = 0; var monthsCount = 0; var monthsCountWithExtra = 0; // Calculate standard amortization var tempBalance = initialBalance; for (var i = 0; i 0.01 && currentMonth tempBalance) { totalPrincipalPayment = tempBalance; // Pay off remaining balance interest = 0; // No more interest if paid off tempBalance = 0; } else { tempBalance -= totalPrincipalPayment; } chartData.datasets[1].data.push(Math.max(0, tempBalance)); chartData.labels.push(currentMonth.toString()); // Use cumulative month count totalInterestPaidWithExtra += interest; monthsCountWithExtra++; currentMonth++; if (tempBalance === 0) break; } // Pad the shorter dataset with last known value or 0 while (chartData.datasets[0].data.length < chartData.datasets[1].data.length) { chartData.datasets[0].data.push(0); } while (chartData.datasets[1].data.length < chartData.datasets[0].data.length) { chartData.datasets[1].data.push(0); } // Adjust labels if payoff is accelerated significantly if (monthsCountWithExtra < chartData.labels.length) { chartData.labels = chartData.labels.slice(0, monthsCountWithExtra); chartData.datasets[0].data = chartData.datasets[0].data.slice(0, monthsCountWithExtra); chartData.datasets[1].data = chartData.datasets[1].data.slice(0, monthsCountWithExtra); } if (window.myChart) { window.myChart.destroy(); } window.myChart = new Chart(ctx, { type: 'line', data: chartData, options: { responsive: true, maintainAspectRatio: false, scales: { x: { title: { display: true, text: 'Month Number' } }, y: { title: { display: true, text: 'Remaining Balance ($)' }, beginAtZero: true } } } }); } function calculateMonthlyPayment(principal, monthlyRate, months) { if (monthlyRate === 0) return principal / months; var numerator = monthlyRate * Math.pow(1 + monthlyRate, months); var denominator = Math.pow(1 + monthlyRate, months) – 1; return principal * (numerator / denominator); }

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// Chart.js library is assumed to be loaded. // For a standalone HTML file, you'd need to include it via CDN or local file. // Example: // Since this must be a single file, we'll proceed assuming Chart.js is available. function validateInput(id, errorId, minValue, maxValue, emptyMessage, invalidMessage) { var input = document.getElementById(id); var errorDiv = document.getElementById(errorId); var value = parseFloat(input.value); errorDiv.style.display = 'none'; // Hide previous errors if (isNaN(value)) { if (input.value.trim() === ") { errorDiv.textContent = emptyMessage; errorDiv.style.display = 'block'; return false; } else { errorDiv.textContent = invalidMessage; errorDiv.style.display = 'block'; return false; } } if (value maxValue) { errorDiv.textContent = `Value cannot exceed ${maxValue}.`; errorDiv.style.display = 'block'; return false; } return true; } function calculatePayoff() { var remainingBalance = parseFloat(document.getElementById('remainingBalance').value); var principalPrepayments = parseFloat(document.getElementById('principalPrepayments').value); var remainingMonths = parseFloat(document.getElementById('remainingMonths').value); var interestRate = parseFloat(document.getElementById('interestRate').value); var isValid = true; isValid = validateInput('remainingBalance', 'remainingBalanceError', 0, undefined, 'Please enter the current mortgage balance.', 'Invalid balance entered.') && isValid; isValid = validateInput('principalPrepayments', 'principalPrepaymentsError', 0, undefined, 'Please enter extra principal payments.', 'Invalid amount entered.') && isValid; isValid = validateInput('remainingMonths', 'remainingMonthsError', 1, 480, 'Please enter the months left on your loan.', 'Invalid number of months.') && isValid; // Max 40 years isValid = validateInput('interestRate', 'interestRateError', 0, 100, 'Please enter the annual interest rate.', 'Invalid rate entered.') && isValid; // Max 100% is unrealistic but safe if (!isValid) { document.getElementById('payoffAmount').textContent = '$0.00'; document.getElementById('totalPrincipalPaid').textContent = '$0.00'; document.getElementById('totalInterestPaid').textContent = '$0.00'; document.getElementById('totalPaidLoan').textContent = '$0.00'; document.getElementById('assumedRemainingMonths').textContent = 'N/A'; document.getElementById('assumedInterestRate').textContent = 'N/A'; document.getElementById('assumedPrepayments').textContent = '$0.00 / month'; return; } var monthlyInterestRate = interestRate / 100 / 12; var monthlyPayment = calculateMonthlyPayment(remainingBalance, monthlyInterestRate, remainingMonths); var balance = remainingBalance; var totalPrincipalPaid = 0; var totalInterestPaid = 0; var monthsCount = 0; var currentMonth = 1; while (balance > 0.01 && currentMonth balance) { paymentTowardsPrincipal = balance; // Pay off remaining balance interest = 0; // No more interest if paid off balance = 0; } else { balance -= paymentTowardsPrincipal; } totalInterestPaid += interest; totalPrincipalPaid += paymentTowardsPrincipal; // This is the actual principal reduction amount monthsCount++; currentMonth++; if (balance === 0) break; } // Recalculate total principal paid to be the initial balance plus any amount paid *over* the initial balance // This logic can be tricky. Let's simplify: total principal reduction is the initial balance. // The 'total paid' is the sum of all payments. var actualTotalPrincipalPaid = remainingBalance; // Assume we are paying down the original balance var actualTotalPaid = actualTotalPrincipalPaid + totalInterestPaid; document.getElementById('payoffAmount').textContent = '$' + actualTotalPaid.toFixed(2); document.getElementById('totalPrincipalPaid').textContent = '$' + actualTotalPrincipalPaid.toFixed(2); document.getElementById('totalInterestPaid').textContent = '$' + totalInterestPaid.toFixed(2); document.getElementById('totalPaidLoan').textContent = '$' + actualTotalPaid.toFixed(2); document.getElementById('assumedRemainingMonths').textContent = monthsCount + ' months'; document.getElementById('assumedInterestRate').textContent = interestRate.toFixed(2) + '%'; document.getElementById('assumedPrepayments').textContent = '$' + principalPrepayments.toFixed(2) + ' / month'; // Redraw chart with potentially new effective months drawChart(remainingBalance, interestRate, remainingMonths, principalPrepayments); } function resetCalculator() { document.getElementById('remainingBalance').value = '200000'; document.getElementById('principalPrepayments').value = '0'; document.getElementById('remainingMonths').value = '180'; // 15 years document.getElementById('interestRate').value = '4.0'; // Clear errors document.getElementById('remainingBalanceError').style.display = 'none'; document.getElementById('principalPrepaymentsError').style.display = 'none'; document.getElementById('remainingMonthsError').style.display = 'none'; document.getElementById('interestRateError').style.display = 'none'; calculatePayoff(); // Recalculate with default values } function copyResults() { var payoffAmount = document.getElementById('payoffAmount').textContent; var totalPrincipalPaid = document.getElementById('totalPrincipalPaid').textContent; var totalInterestPaid = document.getElementById('totalInterestPaid').textContent; var totalPaidLoan = document.getElementById('totalPaidLoan').textContent; var assumedRemainingMonths = document.getElementById('assumedRemainingMonths').textContent; var assumedInterestRate = document.getElementById('assumedInterestRate').textContent; var assumedPrepayments = document.getElementById('assumedPrepayments').textContent; var resultsText = "— Mortgage Payoff Calculation Results —\n\n"; resultsText += "Estimated Payoff Amount: " + payoffAmount + "\n"; resultsText += "Total Principal Paid: " + totalPrincipalPaid + "\n"; resultsText += "Total Interest Paid: " + totalInterestPaid + "\n"; resultsText += "Total Paid Over Life of Loan: " + totalPaidLoan + "\n\n"; resultsText += "— Key Assumptions —\n"; resultsText += "Remaining Loan Term: " + assumedRemainingMonths + "\n"; resultsText += "Annual Interest Rate: " + assumedInterestRate + "\n"; resultsText += "Extra Principal Payments: " + assumedPrepayments + "\n"; // Use navigator.clipboard if available, otherwise fallback if (navigator.clipboard && navigator.clipboard.writeText) { navigator.clipboard.writeText(resultsText).then(function() { alert('Results copied to clipboard!'); }).catch(function(err) { console.error('Failed to copy text: ', err); fallbackCopyTextToClipboard(resultsText); }); } else { fallbackCopyTextToClipboard(resultsText); } } function fallbackCopyTextToClipboard(text) { var textArea = document.createElement("textarea"); textArea.value = text; textArea.style.position = "fixed"; // Avoid scrolling to bottom of page in MS Edge. textArea.style.top = "0"; textArea.style.left = "0"; textArea.style.width = "2em"; textArea.style.height = "2em"; textArea.style.padding = "0"; textArea.style.border = "none"; textArea.style.outline = "none"; textArea.style.boxShadow = "none"; document.body.appendChild(textArea); textArea.focus(); textArea.select(); try { var successful = document.execCommand('copy'); var msg = successful ? 'successful' : 'unsuccessful'; alert('Results copied to clipboard! (' + msg + ')'); } catch (err) { alert('Oops, unable to copy results. Please copy manually.'); console.error('Fallback: Oops, unable to copy', err); } document.body.removeChild(textArea); } // Initial calculation on page load document.addEventListener('DOMContentLoaded', function() { // Check if Chart.js is loaded before drawing chart if (typeof Chart !== 'undefined') { resetCalculator(); // Load defaults and calculate } else { // Optionally inform the user or attempt to load Chart.js console.error("Chart.js not loaded. Chart will not be displayed."); // Try to load Chart.js if not present var script = document.createElement('script'); script.src = 'https://cdn.jsdelivr.net/npm/chart.js'; script.onload = function() { resetCalculator(); // Recalculate and draw chart after Chart.js loads }; document.head.appendChild(script); } });

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