Islamic Mortgage Calculator

Islamic Mortgage Calculator – Sharia-Compliant Financing body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background-color: #f8f9fa; color: #333; line-height: 1.6; margin: 0; padding: 0; } .container { max-width: 1000px; margin: 20px auto; padding: 20px; background-color: #fff; box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1); border-radius: 8px; } header { background-color: #004a99; color: #fff; padding: 20px; text-align: center; border-radius: 8px 8px 0 0; margin-bottom: 20px; } header h1 { margin: 0; font-size: 2.5em; } .loan-calc-container { background-color: #e9ecef; padding: 25px; border-radius: 8px; margin-bottom: 30px; } .input-group { margin-bottom: 20px; text-align: left; } .input-group label { display: block; margin-bottom: 8px; font-weight: bold; color: #004a99; } .input-group input[type="number"], .input-group input[type="text"], .input-group select { width: calc(100% – 22px); padding: 10px; border: 1px solid #ccc; border-radius: 4px; font-size: 1em; box-sizing: border-box; } .input-group .helper-text { font-size: 0.85em; color: #666; margin-top: 5px; display: block; } .error-message { color: #dc3545; font-size: 0.85em; margin-top: 5px; display: none; } .error-message.visible { display: block; } button { background-color: #004a99; color: white; padding: 12px 20px; border: none; border-radius: 4px; cursor: pointer; font-size: 1em; margin-right: 10px; transition: background-color 0.3s ease; } button:hover { background-color: #003366; } button.reset { background-color: #6c757d; } button.reset:hover { background-color: #5a6268; } .results-container { background-color: #fff; padding: 25px; border-radius: 8px; margin-top: 30px; border: 1px solid #dee2e6; } .results-container h2 { color: #004a99; margin-top: 0; border-bottom: 2px solid #004a99; padding-bottom: 10px; margin-bottom: 20px; } .main-result { background-color: #28a745; color: white; padding: 15px; text-align: center; border-radius: 5px; margin-bottom: 20px; font-size: 1.8em; font-weight: bold; } .intermediate-results div, .key-assumptions div { margin-bottom: 10px; font-size: 1.1em; } .intermediate-results span, .key-assumptions span { font-weight: bold; color: #004a99; } .formula-explanation { font-size: 0.9em; color: #666; margin-top: 15px; padding-top: 15px; border-top: 1px dashed #ccc; } table { width: 100%; border-collapse: collapse; margin-top: 20px; } th, td { padding: 10px; text-align: left; border: 1px solid #dee2e6; } th { background-color: #004a99; color: white; } tr:nth-child(even) { background-color: #f2f2f2; } caption { font-size: 1.1em; font-weight: bold; margin-bottom: 10px; color: #004a99; caption-side: top; text-align: left; } canvas { margin-top: 20px; width: 100% !important; height: auto !important; border: 1px solid #dee2e6; border-radius: 4px; } .article-section { margin-top: 40px; padding-top: 20px; border-top: 1px solid #eee; } .article-section h2 { color: #004a99; margin-bottom: 15px; font-size: 1.8em; } .article-section h3 { color: #004a99; margin-top: 25px; margin-bottom: 10px; font-size: 1.4em; } .article-section p, .article-section ul, .article-section ol { margin-bottom: 15px; } .article-section ul, .article-section ol { padding-left: 20px; } .article-section li { margin-bottom: 8px; } .faq-item { margin-bottom: 15px; } .faq-item h3 { margin-bottom: 5px; font-size: 1.2em; cursor: pointer; color: #004a99; } .faq-item p { margin-top: 5px; display: none; padding-left: 15px; border-left: 3px solid #004a99; } .faq-item p.visible { display: block; } .internal-links ul { list-style: none; padding: 0; } .internal-links li { margin-bottom: 10px; } .internal-links a { color: #004a99; text-decoration: none; font-weight: bold; } .internal-links a:hover { text-decoration: underline; } .internal-links span { font-size: 0.9em; color: #666; display: block; margin-top: 3px; } .highlight { background-color: #fff3cd; padding: 2px 5px; border-radius: 3px; } .loan-calc-container input:focus, .loan-calc-container select:focus { outline: none; border-color: #004a99; box-shadow: 0 0 0 2px rgba(0, 74, 153, 0.2); } .results-container button { background-color: #6c757d; } .results-container button:hover { background-color: #5a6268; }

Islamic Mortgage Calculator

Calculate your Sharia-compliant home financing payments

Islamic Mortgage Details

Enter the total price of the property.
The amount you pay upfront. Must be at least 20% of property price.
The duration of your financing agreement.
The annual profit rate agreed upon (e.g., 5.0 for 5%).
Annual fee for property management/service (e.g., 0.5 for 0.5%).

Your Islamic Mortgage Calculation

The monthly payment is calculated using the Diminishing Musharakah (DM) model, which involves a decreasing share of ownership and a rent component. The formula approximates the total monthly obligation as the sum of the amortized principal (based on a standard mortgage formula for the financed amount) and the monthly rent (calculated on the outstanding balance).

Monthly Payment ≈ (P * r * (1+r)^n) / ((1+r)^n – 1) + (Outstanding Balance * Service Rate / 12) Where: P = Financed Amount r = Monthly Profit Rate (Annual Profit Rate / 12) n = Total number of payments (Financing Term in Years * 12) Outstanding Balance = Remaining principal amount Service Rate = Annual Service Fee

Amortization Schedule

Monthly breakdown of your Islamic mortgage payments
Month Starting Balance Payment Profit Portion Service Fee Portion Principal Repayment Ending Balance

Payment Breakdown Chart

Key Assumptions

Enter your details and click 'Calculate'.

What is an Islamic Mortgage?

An Islamic mortgage, also known as a Sharia-compliant home financing or Halal mortgage, is a home loan structured to adhere to Islamic law (Sharia). The core principle of Sharia finance is the prohibition of Riba, which translates to interest or usury. Therefore, traditional interest-based mortgages are forbidden. Instead, Islamic mortgages utilize alternative structures that allow Muslims to purchase homes without violating their religious beliefs. These structures typically involve profit-sharing, leasing, or a partnership model between the financial institution and the homebuyer.

Who should use it?

  • Muslim individuals and families seeking to purchase a home in compliance with their faith.
  • Anyone interested in ethical or interest-free financing options, even if not strictly for religious reasons.
  • Individuals looking for transparent and partnership-based financial products.

Common misconceptions:

  • Misconception: Islamic mortgages are always more expensive.
    Reality: While structures differ, costs can be competitive, especially when considering the long-term value and ethical alignment.
  • Misconception: They are only for Muslims.
    Reality: While designed for Sharia compliance, the principles of ethical and partnership-based finance can appeal to a broader audience.
  • Misconception: They are overly complex.
    Reality: While the underlying contracts are different, the user experience is often similar to conventional mortgages, with clear monthly payments.

Islamic Mortgage Formula and Mathematical Explanation

The most common structures for an Islamic mortgage are Diminishing Musharakah (DM) and Murabaha. This calculator primarily focuses on the Diminishing Musharakah model, which is a partnership agreement where the bank and the customer jointly own the property. The customer gradually buys out the bank's share while also paying rent on the portion of the property they do not yet own. The goal is for the customer to eventually own the entire property.

Diminishing Musharakah (DM) Model Breakdown:

The total monthly payment for the customer typically consists of two main components:

  1. Rent Payment: This is paid on the bank's share of the property. The rent is usually calculated based on a market rate, similar to interest but framed as rental income for the bank.
  2. Acquisition Payment (Principal Repayment): This is the amount the customer pays to gradually increase their ownership share by buying out the bank's portion.

The calculation can be complex as the bank's share decreases, and the customer's share increases each month. A simplified approach often used in calculators approximates the total monthly payment. It combines a standard principal and interest (P&I) calculation for the total financed amount (as if it were a conventional loan) with a service fee component calculated on the outstanding balance.

Simplified Calculation Formula:

Monthly Payment ≈ (Monthly Principal Repayment) + (Monthly Rent)

Where:

  • Monthly Principal Repayment: Calculated using the standard annuity formula for the total financed amount:
    P_monthly = (P * r * (1+r)^n) / ((1+r)^n - 1)
  • Monthly Rent: Calculated on the outstanding balance of the bank's share. For simplicity in calculators, this is often approximated by applying the annual service fee rate to the outstanding balance and dividing by 12. A more accurate DM model adjusts the rent based on the diminishing share. This calculator uses a simplified approach where the "Profit Rate" covers the bank's return on its share, and the "Service Fee" covers property management/maintenance costs. The total monthly payment is the sum of the amortized principal (based on the profit rate) and the service fee.

Variables Table:

Variables Used in Islamic Mortgage Calculation
Variable Meaning Unit Typical Range
Property Price The total cost of the property being purchased. Currency ($) $100,000 – $1,000,000+
Initial Down Payment The upfront amount paid by the buyer. Currency ($) 20% – 50% of Property Price
Financed Amount The total amount borrowed from the financial institution (Property Price – Down Payment). Currency ($) $80,000 – $800,000+
Financing Term The duration of the financing agreement. Years 10 – 30 Years
Annual Profit Rate The annual rate of profit charged by the institution on the financed amount. This replaces conventional interest. Percentage (%) 3.0% – 7.0%
Annual Service Fee An annual fee charged for property management, maintenance, or other services. Percentage (%) 0.25% – 1.5%
Monthly Payment The total amount paid by the buyer each month, including principal, profit, and service fees. Currency ($) Calculated
Total Profit Paid The sum of all profit portions over the financing term. Currency ($) Calculated
Total Service Fees Paid The sum of all service fee portions over the financing term. Currency ($) Calculated

Practical Examples (Real-World Use Cases)

Example 1: First-Time Homebuyer

Aisha is a young professional looking to buy her first apartment. She finds a property priced at $350,000. She has saved $70,000 for a down payment (20%). She wants a financing term of 30 years and finds an Islamic bank offering a competitive annual profit rate of 4.5% and an annual service fee of 0.5%.

Inputs:

  • Property Price: $350,000
  • Initial Down Payment: $70,000
  • Financing Term: 30 Years
  • Annual Profit Rate: 4.5%
  • Annual Service Fee: 0.5%

Calculation Results (using the calculator):

  • Financed Amount: $280,000
  • Estimated Monthly Payment: ~$1,700.50 (This includes principal repayment and profit/rent)
  • Total Profit Paid: ~$242,180
  • Total Service Fees Paid: ~$42,000

Financial Interpretation: Aisha will pay approximately $1,700.50 per month for 30 years. Over the life of the financing, the total amount paid towards profit to the bank will be around $242,180, and service fees will amount to $42,000. This structure allows her to own her home without paying interest, adhering to Sharia principles.

Example 2: Refinancing for a Family Home

The Khan family is looking to upgrade to a larger home. They found a property for $500,000 and plan to put down $150,000 (30%). They need financing for 25 years. Their current Islamic financing provider offers an annual profit rate of 5.2% and an annual service fee of 0.75%.

Inputs:

  • Property Price: $500,000
  • Initial Down Payment: $150,000
  • Financing Term: 25 Years
  • Annual Profit Rate: 5.2%
  • Annual Service Fee: 0.75%

Calculation Results (using the calculator):

  • Financed Amount: $350,000
  • Estimated Monthly Payment: ~$2,455.80
  • Total Profit Paid: ~$386,740
  • Total Service Fees Paid: ~$75,000

Financial Interpretation: The Khans will have a monthly obligation of roughly $2,455.80. The total profit paid over 25 years will be substantial ($386,740), reflecting the bank's return on its investment, alongside $75,000 in service fees. This example highlights the long-term financial commitment involved in acquiring a home through an Islamic mortgage.

How to Use This Islamic Mortgage Calculator

Our Islamic mortgage calculator is designed to provide a clear estimate of your potential Sharia-compliant home financing costs. Follow these simple steps:

  1. Enter Property Price: Input the total purchase price of the home you intend to buy.
  2. Input Initial Down Payment: Enter the amount of money you will pay upfront. Ensure this meets the minimum requirement (often 20% for Islamic financing).
  3. Specify Financing Term: Select the number of years you wish to finance the property over. Longer terms generally mean lower monthly payments but higher total profit paid.
  4. Enter Annual Profit Rate: Input the annual profit rate offered by the Islamic financial institution. This is the Sharia-compliant alternative to interest.
  5. Enter Annual Service Fee: Input any annual fees associated with property management or services.
  6. Click 'Calculate': Once all fields are populated, click the 'Calculate' button.

How to Read Results:

  • Monthly Payment: This is your estimated total monthly outgoing, combining principal repayment and profit/rent.
  • Financed Amount: The total amount you are borrowing.
  • Total Profit Paid: The cumulative profit paid to the institution over the financing term.
  • Total Service Fees Paid: The cumulative service fees paid over the term.
  • Amortization Schedule: Provides a month-by-month breakdown, showing how each payment is allocated and how your balance decreases.
  • Payment Breakdown Chart: Visually represents the proportion of your monthly payment going towards profit, service fees, and principal repayment over time.

Decision-Making Guidance: Use the results to compare offers from different Islamic financial institutions. Adjust the inputs (like down payment or term) to see how they impact your monthly payments and total cost. This tool helps you understand the financial implications and make an informed decision aligned with your budget and Sharia principles.

Key Factors That Affect Islamic Mortgage Results

Several factors significantly influence the outcome of your Islamic mortgage calculation. Understanding these can help you optimize your financing:

  1. Profit Rate: This is arguably the most critical factor. A higher annual profit rate directly increases your monthly payment and the total profit paid over the financing term. Market conditions and the financial institution's policies determine this rate.
  2. Financing Term (Duration): A longer term reduces your monthly payment, making it more affordable on a month-to-month basis. However, it also means you will pay profit for a longer period, increasing the total profit paid significantly. A shorter term increases monthly payments but reduces the overall profit cost.
  3. Initial Down Payment: A larger down payment reduces the amount you need to finance. This lowers your monthly payments, reduces the total profit paid, and can sometimes help you secure a better profit rate from the institution. It's a key factor in affordability and total cost.
  4. Property Price: The base price of the property dictates the scale of the financing. A higher property price naturally leads to a larger financed amount, higher monthly payments, and a greater total cost, assuming other factors remain constant.
  5. Service Fees: While often smaller than the profit component, annual service fees add to the overall cost. Variations in these fees between institutions can impact the total amount paid. Ensure you understand what these fees cover.
  6. Economic Conditions & Inflation: While not directly in the calculation formula, prevailing economic conditions influence profit rates offered by banks. High inflation might lead banks to increase profit rates to maintain their real return. Understanding the economic climate helps in negotiating or choosing the right time to apply for financing.
  7. Regulatory Changes: Islamic finance regulations can evolve. Changes in guidelines or interpretations of Sharia principles by regulatory bodies might affect the structure or availability of certain Islamic mortgage products.

Frequently Asked Questions (FAQ)

What is the difference between an Islamic mortgage and a conventional mortgage?

The fundamental difference lies in the prohibition of interest (Riba) in Islamic finance. Conventional mortgages charge interest, while Islamic mortgages use structures like Diminishing Musharakah (partnership and rent) or Murabaha (cost-plus sale) to generate profit for the lender without charging interest.

Is an Islamic mortgage always more expensive?

Not necessarily. While the structures are different, the total cost can be competitive. Profit rates offered by Islamic banks are often comparable to conventional mortgage interest rates. The perceived complexity or different fee structures can sometimes lead to this assumption, but careful comparison is key.

What does "Diminishing Musharakah" mean?

Diminishing Musharakah translates to "decreasing partnership." In an Islamic mortgage context, it means the bank and the buyer jointly purchase the property. The buyer then gradually purchases the bank's share over time, increasing their ownership stake until they own the property outright. During this period, the buyer also pays rent to the bank for using the bank's share of the property.

Can non-Muslims use Islamic mortgages?

While designed to comply with Islamic law, the principles of ethical, partnership-based finance can be appealing to anyone. Some individuals may choose an Islamic mortgage for its transparency or ethical framework, regardless of their religious beliefs.

What is the typical down payment requirement for an Islamic mortgage?

Most Islamic financial institutions require a minimum down payment, often around 20% of the property value. Some may require more depending on the property type, location, and the buyer's financial profile. A larger down payment can lead to better terms.

How is the "profit rate" determined?

The profit rate is determined by the Islamic financial institution based on market conditions, the bank's cost of funds, the risk associated with the financing, and regulatory guidelines. It serves as the lender's return, replacing conventional interest.

What happens if I miss a payment on an Islamic mortgage?

Similar to conventional mortgages, missing payments can have consequences. Islamic banks may impose late payment charges, but these are typically channeled towards charitable causes rather than benefiting the bank directly. Repeated defaults can lead to foreclosure, following Sharia-compliant procedures.

Are there government incentives or tax benefits for Islamic mortgages?

This varies significantly by country and region. Some jurisdictions offer tax benefits or incentives for Sharia-compliant financing products to encourage their adoption. It's advisable to consult with a financial advisor or the specific institution about potential benefits in your location.

Related Tools and Internal Resources

var chartInstance = null; function formatCurrency(amount) { return '$' + amount.toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,'); } function formatRate(rate) { return rate.toFixed(2) + '%'; } function validateInput(id, min, max, errorMessageId, helperTextId, isPercentage = false) { var input = document.getElementById(id); var value = parseFloat(input.value); var errorDiv = document.getElementById(errorMessageId); var helperText = document.getElementById(helperTextId); var isValid = true; errorDiv.innerText = "; errorDiv.classList.remove('visible'); input.style.borderColor = '#ccc'; if (isNaN(value) || input.value.trim() === ") { errorDiv.innerText = 'This field is required.'; isValid = false; } else if (value 100) { errorDiv.innerText = 'Percentage cannot exceed 100%.'; isValid = false; } else if (min !== null && value max) { errorDiv.innerText = 'Value too high. Maximum is ' + (isPercentage ? formatRate(max) : formatCurrency(max)) + '.'; isValid = false; } if (isValid) { input.style.borderColor = '#28a745'; if (helperText) helperText.style.color = '#666'; } else { input.style.borderColor = '#dc3545'; if (helperText) helperText.style.color = '#dc3545'; errorDiv.classList.add('visible'); } return isValid; } function calculateIslamicMortgage() { var propertyPrice = parseFloat(document.getElementById('propertyPrice').value); var downPayment = parseFloat(document.getElementById('downPayment').value); var financingTermYears = parseInt(document.getElementById('financingTerm').value); var annualProfitRate = parseFloat(document.getElementById('profitRate').value); var annualServiceFee = parseFloat(document.getElementById('serviceFee').value); var resultsDiv = document.getElementById('results'); var noResultsDiv = document.getElementById('noResults'); // — Input Validations — var validPropertyPrice = validateInput('propertyPrice', 10000, null, 'propertyPriceError', null); var validDownPayment = validateInput('downPayment', 0, null, 'downPaymentError', null); var validFinancingTerm = validateInput('financingTerm', 1, 50, 'financingTermError', null); var validProfitRate = validateInput('profitRate', 0.1, 20, 'profitRateError', null, true); var validServiceFee = validateInput('serviceFee', 0, 5, 'serviceFeeError', null, true); // Additional specific validations var minDownPayment = propertyPrice * 0.20; if (downPayment 0 && totalPayments > 0) { monthlyPrincipalPayment = (financedAmount * monthlyProfitRate) / (1 – Math.pow(1 + monthlyProfitRate, -totalPayments)); } else if (totalPayments > 0) { // Handle 0% profit rate monthlyPrincipalPayment = financedAmount / totalPayments; } // Simplified total monthly payment: Principal + Service Fee on outstanding balance // For simplicity in this calculator, we'll calculate a fixed total payment that covers // the amortized principal and an average service fee. A true DM model is more dynamic. // Let's approximate the total payment as the P&I payment plus the service fee on the initial balance. // A more accurate approach would involve iterative calculations or a more complex formula. // For this calculator, we'll use the P&I payment and add the service fee component. var estimatedMonthlyPayment = monthlyPrincipalPayment + (financedAmount * monthlyServiceRate); var totalProfitPaid = (estimatedMonthlyPayment * totalPayments) – financedAmount – (financedAmount * monthlyServiceRate * totalPayments); // Approximate total profit var totalServiceFeesPaid = financedAmount * monthlyServiceRate * totalPayments; // Approximate total service fees // Adjust total profit calculation to be more accurate based on the simplified payment totalProfitPaid = (estimatedMonthlyPayment * totalPayments) – financedAmount – totalServiceFeesPaid; if (totalProfitPaid < 0) totalProfitPaid = 0; // Ensure profit isn't negative document.getElementById('monthlyPayment').innerText = formatCurrency(estimatedMonthlyPayment); document.getElementById('financedAmount').innerText = 'Financed Amount: ' + formatCurrency(financedAmount); document.getElementById('totalProfit').innerText = 'Total Profit Paid: ' + formatCurrency(totalProfitPaid); document.getElementById('totalServiceFees').innerText = 'Total Service Fees Paid: ' + formatCurrency(totalServiceFeesPaid); var assumptionsHtml = 'Financed Amount: ' + formatCurrency(financedAmount) + '' + 'Annual Profit Rate: ' + formatRate(annualProfitRate) + '' + 'Annual Service Fee: ' + formatRate(annualServiceFee) + '' + 'Financing Term: ' + financingTermYears + ' Years'; document.getElementById('assumptions').innerHTML = assumptionsHtml; resultsDiv.style.display = 'block'; noResultsDiv.style.display = 'none'; // — Amortization Table and Chart — populateAmortizationTable(financedAmount, monthlyPrincipalPayment, monthlyServiceRate, totalPayments, annualProfitRate, annualServiceFee); updateChart(financedAmount, monthlyPrincipalPayment, monthlyServiceRate, totalPayments, annualProfitRate, annualServiceFee); } function populateAmortizationTable(principal, monthlyPmt, monthlyServiceRate, totalPayments, annualProfitRate, annualServiceFee) { var tableBody = document.getElementById('amortizationTableBody'); tableBody.innerHTML = ''; // Clear previous data var balance = principal; var totalProfitAccumulated = 0; var totalServiceFeesAccumulated = 0; var totalPrincipalRepaid = 0; for (var i = 1; i balance) { principalRepayment = balance; paymentForMonth = principalRepayment + profitPortion + serviceFeePortion; // Adjust total payment } balance -= principalRepayment; if (balance < 0) balance = 0; // Ensure balance doesn't go negative totalProfitAccumulated += profitPortion; totalServiceFeesAccumulated += serviceFeePortion; totalPrincipalRepaid += principalRepayment; row.insertCell(0).innerText = i; row.insertCell(1).innerText = formatCurrency(balance + principalRepayment); // Starting Balance for this month row.insertCell(2).innerText = formatCurrency(paymentForMonth); row.insertCell(3).innerText = formatCurrency(profitPortion); row.insertCell(4).innerText = formatCurrency(serviceFeePortion); row.insertCell(5).innerText = formatCurrency(principalRepayment); row.insertCell(6).innerText = formatCurrency(balance); // Ending Balance } // Update summary results if needed (optional, as they are calculated above) document.getElementById('totalProfit').innerText = 'Total Profit Paid: ' + formatCurrency(totalProfitAccumulated); document.getElementById('totalServiceFees').innerText = 'Total Service Fees Paid: ' + formatCurrency(totalServiceFeesAccumulated); } function updateChart(principal, monthlyPmt, monthlyServiceRate, totalPayments, annualProfitRate, annualServiceFee) { var ctx = document.getElementById('paymentBreakdownChart').getContext('2d'); // Destroy previous chart instance if it exists if (chartInstance) { chartInstance.destroy(); } var labels = []; var profitData = []; var serviceFeeData = []; var principalData = []; var balance = principal; var monthlyProfitRate = annualProfitRate / 100 / 12; for (var i = 1; i balance) { principalRepayment = balance; paymentForMonth = principalRepayment + profitPortion + serviceFeePortion; } balance -= principalRepayment; if (balance < 0) balance = 0; profitData.push(profitPortion); serviceFeeData.push(serviceFeePortion); principalData.push(principalRepayment); } chartInstance = new Chart(ctx, { type: 'bar', // Changed to bar for better visualization of components data: { labels: labels, datasets: [{ label: 'Profit Portion', data: profitData, backgroundColor: 'rgba(255, 99, 132, 0.6)', // Reddish borderColor: 'rgba(255, 99, 132, 1)', borderWidth: 1, stack: 'Mortgage' }, { label: 'Service Fee Portion', data: serviceFeeData, backgroundColor: 'rgba(54, 162, 235, 0.6)', // Blueish borderColor: 'rgba(54, 162, 235, 1)', borderWidth: 1, stack: 'Mortgage' }, { label: 'Principal Repayment', data: principalData, backgroundColor: 'rgba(75, 192, 192, 0.6)', // Greenish borderColor: 'rgba(75, 192, 192, 1)', borderWidth: 1, stack: 'Mortgage' }] }, options: { responsive: true, maintainAspectRatio: false, scales: { x: { stacked: true, title: { display: true, text: 'Payment Period' } }, y: { stacked: true, beginAtZero: true, title: { display: true, text: 'Amount ($)' }, ticks: { callback: function(value) { return formatCurrency(value); } } } }, plugins: { tooltip: { callbacks: { label: function(context) { var label = context.dataset.label || ''; if (label) { label += ': '; } if (context.parsed.y !== null) { label += formatCurrency(context.parsed.y); } return label; } } } } } }); } function resetCalculator() { document.getElementById('propertyPrice').value = '300000'; document.getElementById('downPayment').value = '60000'; document.getElementById('financingTerm').value = '30'; document.getElementById('profitRate').value = '5.0'; document.getElementById('serviceFee').value = '0.5'; // Clear errors and results document.getElementById('propertyPriceError').innerText = ''; document.getElementById('propertyPriceError').classList.remove('visible'); document.getElementById('downPaymentError').innerText = ''; document.getElementById('downPaymentError').classList.remove('visible'); document.getElementById('financingTermError').innerText = ''; document.getElementById('financingTermError').classList.remove('visible'); document.getElementById('profitRateError').innerText = ''; document.getElementById('profitRateError').classList.remove('visible'); document.getElementById('serviceFeeError').innerText = ''; document.getElementById('serviceFeeError').classList.remove('visible'); document.getElementById('results').style.display = 'none'; document.getElementById('noResults').style.display = 'block'; // Reset input borders document.getElementById('propertyPrice').style.borderColor = '#ccc'; document.getElementById('downPayment').style.borderColor = '#ccc'; document.getElementById('financingTerm').style.borderColor = '#ccc'; document.getElementById('profitRate').style.borderColor = '#ccc'; document.getElementById('serviceFee').style.borderColor = '#ccc'; // Clear chart and table var tableBody = document.getElementById('amortizationTableBody'); tableBody.innerHTML = ''; if (chartInstance) { chartInstance.destroy(); chartInstance = null; } var canvas = document.getElementById('paymentBreakdownChart'); var ctx = canvas.getContext('2d'); ctx.clearRect(0, 0, canvas.width, canvas.height); } function copyResults() { var monthlyPayment = document.getElementById('monthlyPayment').innerText; var financedAmount = document.getElementById('financedAmount').innerText; var totalProfit = document.getElementById('totalProfit').innerText; var totalServiceFees = document.getElementById('totalServiceFees').innerText; var assumptions = document.getElementById('assumptions').innerText; var textToCopy = "Islamic Mortgage Calculation Results:\n\n" + "Monthly Payment: " + monthlyPayment + "\n" + financedAmount + "\n" + totalProfit + "\n" + totalServiceFees + "\n\n" + "Key Assumptions:\n" + assumptions + "\n\n" + "Note: This is an estimate based on the provided inputs."; navigator.clipboard.writeText(textToCopy).then(function() { // Optional: Show a confirmation message var copyButton = document.querySelector('.results-container button'); var originalText = copyButton.innerText; copyButton.innerText = 'Copied!'; setTimeout(function() { copyButton.innerText = originalText; }, 2000); }).catch(function(err) { console.error('Failed to copy text: ', err); // Fallback for older browsers or if clipboard API fails alert('Failed to copy results. Please copy manually.'); }); } function toggleFaq(element) { var paragraph = element.nextElementSibling; paragraph.classList.toggle('visible'); } // Initial calculation on load if values are present document.addEventListener('DOMContentLoaded', function() { // Check if inputs have default values and trigger calculation var inputs = document.querySelectorAll('.loan-calc-container input[type="number"], .loan-calc-container select'); var allDefaultsSet = true; inputs.forEach(function(input) { if (input.value === '' || input.value === '0') { allDefaultsSet = false; } }); if (allDefaultsSet) { // Trigger calculation only if all default values are set and valid // A small delay can help ensure the DOM is fully ready setTimeout(function() { calculateIslamicMortgage(); }, 100); } else { document.getElementById('results').style.display = 'none'; document.getElementById('noResults').style.display = 'block'; } // Add event listeners for real-time updates (optional, can be performance intensive) inputs.forEach(function(input) { input.addEventListener('input', function() { // Only calculate if results are already visible or if it's the first calculation if (document.getElementById('results').style.display === 'block' || document.getElementById('noResults').style.display === 'none') { calculateIslamicMortgage(); } }); }); }); // Include Chart.js library – MUST be loaded externally or included inline // For this example, we assume Chart.js is available globally. // In a real-world scenario, you'd include it via CDN or a local file: // // Since we cannot use external scripts per instructions, we'll simulate its presence. // If running this code, ensure Chart.js is loaded in the HTML head. // For the purpose of this output, we assume 'Chart' is defined. // If Chart.js is not loaded, the chart update will fail. // Placeholder for Chart.js if not loaded externally if (typeof Chart === 'undefined') { console.warn("Chart.js library not found. Charts will not render."); // Define a dummy Chart object to prevent errors, but it won't work. window.Chart = function() { this.destroy = function() { console.log('Dummy chart destroy called'); }; console.log('Dummy Chart constructor called'); }; }

Leave a Comment