Calculate Roi Real Estate

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Calculate ROI Real Estate: Your Ultimate Guide & Calculator

Real Estate ROI Calculator

Calculate your potential Return on Investment (ROI) for a real estate property. Enter the details below to see your projected profitability.

The total price paid for the property.
Costs for repairs, upgrades, and renovations.
The projected price you'll sell the property for.
How long you plan to own the property.
Includes property taxes, insurance, maintenance, etc. (annual).
Commissions, closing costs, etc., as a percentage of selling price.

Your Real Estate ROI

–.–%
Return on Investment (ROI)
Total Investment:
Total Profit:
Net Sale Proceeds:
Formula: ROI = (Net Profit / Total Investment) * 100
Key Assumptions:

Purchase Price:

Renovation Costs:

Selling Price:

Holding Period: years

Annual Operating Expenses:

Selling Costs: %

ROI Over Time Projection

Projected ROI based on holding period and annual operating expenses.

Investment Breakdown

Metric Value
Purchase Price
Renovation & Improvement Costs
Total Investment
Gross Sale Proceeds
Selling Costs
Net Sale Proceeds
Total Operating Expenses
Total Profit
Annualized ROI

What is Real Estate ROI?

Real Estate Return on Investment (ROI) is a key metric used by investors to evaluate the profitability of a real estate property. It measures the gain or loss generated on an investment relative to its cost. In simpler terms, it tells you how much money you made (or lost) compared to how much you put in. Understanding your real estate ROI is crucial for making informed decisions, comparing different investment opportunities, and assessing the performance of your portfolio.

Who Should Use It:

  • Real estate investors (both novice and experienced)
  • Property flippers
  • Landlords and rental property owners
  • Anyone considering buying or selling property as an investment
  • Financial advisors and analysts evaluating property investments

Common Misconceptions:

  • ROI is the same as cash flow: While related, cash flow is the net income generated from a property over a period (e.g., monthly rent minus expenses), whereas ROI is a percentage return on the total investment over the entire holding period. A property can have positive cash flow but a low ROI, or vice versa.
  • Ignoring all costs: Many beginners forget to factor in all associated costs like closing costs, renovation expenses, property management fees, vacancy periods, and selling costs. Accurate ROI calculation requires a comprehensive view of all expenditures.
  • Focusing only on appreciation: While property value appreciation is a significant factor, relying solely on it can be risky. Rental income and strategic improvements often contribute more consistently to a healthy ROI.

Real Estate ROI Formula and Mathematical Explanation

The fundamental formula for calculating Real Estate ROI is straightforward, but its components require careful consideration to ensure accuracy. The core idea is to compare your net profit to your total investment.

The Core ROI Formula

The most common formula is:

ROI = (Net Profit / Total Investment) * 100

Let's break down the components:

1. Total Investment

This represents all the capital you've put into the property. It's not just the purchase price; it includes all associated costs incurred to acquire and prepare the property for its intended use (renting or selling).

Total Investment = Purchase Price + Renovation & Improvement Costs + Acquisition Costs (e.g., closing costs, legal fees)

Note: For simplicity in many calculators, acquisition costs might be omitted or bundled into other figures, but they are crucial for a precise calculation. Our calculator focuses on the primary inputs for ease of use.

2. Net Profit

This is the total financial gain from the investment after all expenses have been accounted for. It includes both the profit from selling the property and any net income generated while owning it.

Net Profit = Net Sale Proceeds – Total Operating Expenses – Selling Costs

Where:

  • Net Sale Proceeds = Selling Price – Selling Costs
  • Selling Costs: These are the expenses incurred when selling the property, typically including real estate agent commissions, legal fees, transfer taxes, and other closing costs. Often calculated as a percentage of the selling price.
  • Total Operating Expenses: This is the sum of all costs associated with owning and maintaining the property during the holding period. It includes property taxes, insurance, property management fees, maintenance, repairs (distinct from major renovations), utilities (if not paid by tenant), and accounting for potential vacancy periods.
  • Total Operating Expenses = Annual Operating Expenses * Holding Period (in years)

Putting It All Together

Substituting the components into the main ROI formula:

ROI = [ ( (Selling Price – Selling Costs) – Total Operating Expenses ) / (Purchase Price + Renovation & Improvement Costs) ] * 100

Annualized ROI: To compare investments with different holding periods, it's common to calculate an annualized ROI:

Annualized ROI = ( (1 + Total ROI)^(1 / Holding Period) – 1 ) * 100

Variables Table

Variable Meaning Unit Typical Range
Purchase Price Initial cost to acquire the property. Currency (e.g., USD) Varies widely by location and property type.
Renovation & Improvement Costs Expenses for repairs, upgrades, and enhancements. Currency (e.g., USD) 0% to 50%+ of Purchase Price.
Selling Price Projected price at which the property will be sold. Currency (e.g., USD) Depends on market conditions and property improvements.
Holding Period Duration the property is owned. Years 1 year (flipping) to 30+ years (long-term rental).
Annual Operating Expenses Yearly costs of ownership (taxes, insurance, maintenance, etc.). Currency (e.g., USD) 1% to 10%+ of property value annually.
Selling Costs Percentage Costs associated with selling (commissions, fees). Percentage (%) 3% to 8%.
Total Investment Total capital outlay for the property. Currency (e.g., USD) Sum of Purchase Price, Renovation Costs, etc.
Net Sale Proceeds Revenue from sale after selling costs. Currency (e.g., USD) Selling Price – Selling Costs.
Total Operating Expenses Sum of all operating costs over the holding period. Currency (e.g., USD) Annual Operating Expenses * Holding Period.
Total Profit Overall financial gain from the investment. Currency (e.g., USD) Net Sale Proceeds – Total Operating Expenses – (Purchase Price + Renovation Costs).
ROI Profitability relative to investment cost. Percentage (%) Can be negative, positive, or zero.
Annualized ROI Average yearly return on investment. Percentage (%) Helps compare investments with different timeframes.

Practical Examples (Real-World Use Cases)

Let's illustrate how the Real Estate ROI calculator works with practical scenarios.

Example 1: Property Flip

An investor buys a distressed property intending to renovate and sell it quickly.

Inputs:

  • Purchase Price: $200,000
  • Renovation & Improvement Costs: $40,000
  • Estimated Selling Price: $320,000
  • Holding Period: 1 year
  • Annual Operating Expenses: $3,000 (minimal as it's vacant)
  • Selling Costs Percentage: 6%

Calculation Steps:

  • Total Investment = $200,000 + $40,000 = $240,000
  • Selling Costs = $320,000 * 0.06 = $19,200
  • Net Sale Proceeds = $320,000 – $19,200 = $300,800
  • Total Operating Expenses = $3,000 * 1 = $3,000
  • Total Profit = $300,800 – $3,000 – $240,000 = $57,800
  • ROI = ($57,800 / $240,000) * 100 = 24.08%
  • Annualized ROI = ((1 + 0.2408)^(1/1) – 1) * 100 = 24.08%

Interpretation: This property flip yielded a 24.08% ROI over one year, indicating a profitable venture. The quick turnaround and significant value addition through renovations were key drivers.

Example 2: Long-Term Rental Property

An investor purchases a property to rent out for long-term appreciation and cash flow.

Inputs:

  • Purchase Price: $400,000
  • Renovation & Improvement Costs: $20,000
  • Estimated Selling Price (after 10 years): $650,000
  • Holding Period: 10 years
  • Annual Operating Expenses: $8,000 (taxes, insurance, maintenance, vacancy allowance)
  • Selling Costs Percentage: 5% (negotiated lower for long-term sale)

Calculation Steps:

  • Total Investment = $400,000 + $20,000 = $420,000
  • Selling Costs = $650,000 * 0.05 = $32,500
  • Net Sale Proceeds = $650,000 – $32,500 = $617,500
  • Total Operating Expenses = $8,000 * 10 = $80,000
  • Total Profit = $617,500 – $80,000 – $420,000 = $117,500
  • ROI = ($117,500 / $420,000) * 100 = 27.98%
  • Annualized ROI = ((1 + 0.2798)^(1/10) – 1) * 100 = 2.47%

Interpretation: Over 10 years, the property generated a total ROI of 27.98%. While the total ROI seems modest, the annualized ROI of 2.47% highlights that the primary return comes from long-term appreciation and potentially consistent rental income (which isn't explicitly calculated in this simplified ROI but is a key driver of overall profitability). This strategy prioritizes wealth building over quick gains.

How to Use This Real Estate ROI Calculator

Our Real Estate ROI calculator is designed for simplicity and accuracy. Follow these steps to get your investment insights:

  1. Enter Purchase Price: Input the total amount you paid or are paying for the property.
  2. Add Renovation Costs: Include all expenses for repairs, upgrades, and improvements needed to make the property ready for sale or rent.
  3. Estimate Selling Price: Provide a realistic projection of what you expect to sell the property for. Research comparable sales in the area.
  4. Specify Holding Period: Enter the number of years you plan to own the property before selling.
  5. Input Annual Operating Expenses: Sum up all recurring yearly costs like property taxes, insurance, HOA fees, routine maintenance, and an allowance for vacancies.
  6. Enter Selling Costs Percentage: Estimate the percentage of the selling price that will go towards commissions, closing costs, legal fees, etc.
  7. Click 'Calculate ROI': The calculator will instantly display your projected ROI, along with key intermediate values like Total Investment, Total Profit, and Net Sale Proceeds.

How to Read Results:

  • Main Result (ROI %): This is your primary indicator of profitability. A positive ROI means the investment is profitable; a negative ROI indicates a loss. Higher percentages are generally better.
  • Total Investment: The total capital required for the purchase and improvements.
  • Total Profit: The absolute dollar amount you stand to gain (or lose) after all expenses.
  • Net Sale Proceeds: The amount you receive from the sale after deducting selling costs.
  • Annualized ROI: Useful for comparing investments with different holding periods. It shows the average yearly return.
  • Table Breakdown: Provides a detailed view of each cost and revenue component.
  • Chart: Visualizes how ROI might change based on the holding period, helping you understand the impact of time on your investment.

Decision-Making Guidance:

Use the ROI calculation as a critical tool in your investment decision process:

  • Compare Deals: Evaluate multiple potential properties by comparing their projected ROIs. Aim for investments that meet or exceed your target ROI.
  • Set Realistic Expectations: The calculator helps ground your expectations in numbers, factoring in costs that might otherwise be overlooked.
  • Sensitivity Analysis: Adjust inputs (like selling price or renovation costs) to see how changes impact your ROI. This helps identify potential risks and opportunities.
  • Long-Term Strategy: The annualized ROI helps determine if a property aligns with your long-term wealth-building goals.

Key Factors That Affect Real Estate ROI Results

Several factors significantly influence the profitability of a real estate investment. Understanding these can help you make more accurate projections and strategic decisions.

  • Market Conditions & Appreciation: The overall health of the real estate market and the rate at which property values increase (or decrease) in your specific area are paramount. Economic downturns can lead to negative appreciation, drastically reducing ROI.
  • Purchase Price & Negotiation Skills: Buying a property below market value provides an immediate advantage, lowering your total investment and increasing potential profit margins. Strong negotiation skills are key here.
  • Renovation Strategy & Costs: The amount spent on renovations directly impacts the total investment. Over-improving for the neighborhood can lead to diminishing returns, while under-improving might limit the selling price or rental income potential.
  • Rental Income & Vacancy Rates: For buy-and-hold investors, consistent rental income is vital. High vacancy rates (periods when the property is unrented) significantly reduce cash flow and overall ROI, as operating expenses continue even without income.
  • Operating Expenses Management: Controlling costs like property taxes, insurance premiums, maintenance, and repairs is crucial. Unexpectedly high expenses can erode profits. Effective property management plays a role here.
  • Financing Costs (Interest Rates & Loan Terms): While not directly in this simplified ROI calculation, the cost of borrowing money (mortgage interest) significantly impacts your net profit and cash flow. Higher interest rates increase expenses and reduce the overall return.
  • Holding Period: The longer you hold a property, the more time there is for appreciation and rental income to accumulate. However, it also means longer exposure to market risks and ongoing expenses. Short-term flips rely heavily on quick value addition and sale.
  • Selling Costs & Market Timing: Real estate agent commissions, closing costs, and taxes on sale can be substantial. Selling during a seller's market can command a higher price, potentially offsetting these costs, while selling in a buyer's market might necessitate price reductions.
  • Inflation and Economic Factors: Inflation can increase operating costs and potentially decrease the purchasing power of future rental income or sale proceeds. Conversely, inflation can sometimes drive up property values.
  • Property Type and Location: Different property types (residential, commercial, industrial) and locations (urban, suburban, rural) have distinct market dynamics, risk profiles, and potential returns.

Frequently Asked Questions (FAQ)

What is considered a good Real Estate ROI?
A "good" ROI varies significantly based on the investment strategy, market, risk tolerance, and holding period. Generally, investors aim for ROIs that outperform inflation and other investment alternatives. For buy-and-hold, an annualized ROI of 5-10% or higher is often considered good. For flips, higher ROIs (20%+) are typically expected due to the increased risk and effort. Always compare against your personal financial goals and opportunity costs.
Does this calculator include mortgage interest?
This specific calculator focuses on the core ROI based on total investment and profit, excluding financing costs for simplicity. To account for mortgage interest, you would need to subtract the total interest paid over the holding period from the 'Total Profit' calculation. This would give you a more accurate picture of the ROI on your actual equity invested.
How do I estimate selling costs accurately?
Selling costs typically include real estate agent commissions (often 5-6% of the sale price, split between buyer's and seller's agents), title insurance, escrow fees, transfer taxes, attorney fees, and potential repairs requested by the buyer. It's best to consult with local real estate agents or closing attorneys for the most accurate estimates in your area.
What's the difference between ROI and Cap Rate?
ROI (Return on Investment) is a broader measure that considers all costs, including purchase price, renovations, and selling expenses, over the entire holding period. Cap Rate (Capitalization Rate) is primarily used for income-producing properties and measures the potential rate of return based on the Net Operating Income (NOI) relative to the property's value or purchase price. Cap Rate = NOI / Property Value. It's a snapshot of income potential, while ROI reflects the total return on total investment.
Should I include closing costs in Total Investment?
Yes, for a comprehensive ROI calculation, all costs associated with acquiring the property should be included in the 'Total Investment'. This includes loan origination fees, appraisal fees, title insurance, legal fees, recording fees, and any points paid to the lender. Our calculator simplifies this by focusing on Purchase Price and Renovation Costs, but for precise analysis, add these acquisition costs.
How do property taxes affect ROI?
Property taxes are a significant operating expense. They reduce the net operating income and, consequently, the total profit and ROI. Higher property taxes mean lower profitability, especially for long-term rental properties. It's essential to research the tax rates in the area and factor them accurately into your annual operating expenses.
What if the property value decreases?
If the property value decreases (negative appreciation), your selling price will be lower, potentially leading to a loss on the sale. This can result in a negative Net Sale Proceeds and a negative Total Profit, leading to a negative ROI. This highlights the risk associated with real estate investments and the importance of thorough market research and conservative projections.
Can I use this for commercial properties?
While the core ROI principle applies to commercial properties, the calculation inputs might differ. Commercial properties often have more complex operating expenses (e.g., CAM charges, property management fees calculated differently) and different selling cost structures. This calculator is primarily designed for residential real estate but can serve as a starting point for commercial analysis if you adapt the expense categories accordingly.
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if (!isValid) { resetResults(); return; } var purchasePrice = parseFloat(purchasePriceInput.value); var renovationCosts = parseFloat(renovationCostsInput.value); var sellingPrice = parseFloat(sellingPriceInput.value); var holdingPeriod = parseFloat(holdingPeriodInput.value); var annualOperatingExpenses = parseFloat(annualOperatingExpensesInput.value); var sellingCostsPercentage = parseFloat(sellingCostsPercentageInput.value); var totalInvestmentValue = purchasePrice + renovationCosts; var sellingCosts = sellingPrice * (sellingCostsPercentage / 100); var netSaleProceedsValue = sellingPrice – sellingCosts; var totalOperatingExpensesValue = annualOperatingExpenses * holdingPeriod; var totalProfitValue = netSaleProceedsValue – totalInvestmentValue – totalOperatingExpensesValue; var roiValue = (totalInvestmentValue === 0) ? 0 : (totalProfitValue / totalInvestmentValue) * 100; var annualizedROIValue = (roiValue === 0) ? 0 : (Math.pow(1 + (roiValue / 100), 1 / holdingPeriod) – 1) * 100; mainROI.innerText = formatPercentage(roiValue); totalInvestment.innerText = formatCurrency(totalInvestmentValue); totalProfit.innerText = formatCurrency(totalProfitValue); netSaleProceeds.innerText = formatCurrency(netSaleProceedsValue); assumptionPurchasePrice.innerText = formatCurrency(purchasePrice); assumptionRenovationCosts.innerText = formatCurrency(renovationCosts); assumptionSellingPrice.innerText = formatCurrency(sellingPrice); assumptionHoldingPeriod.innerText = holdingPeriod; assumptionAnnualOperatingExpenses.innerText = formatCurrency(annualOperatingExpenses); assumptionSellingCostsPercentage.innerText = sellingCostsPercentage + '%'; tablePurchasePrice.innerText = formatCurrency(purchasePrice); tableRenovationCosts.innerText = formatCurrency(renovationCosts); tableTotalInvestment.innerText = formatCurrency(totalInvestmentValue); tableGrossSaleProceeds.innerText = formatCurrency(sellingPrice); tableSellingCosts.innerText = formatCurrency(sellingCosts); tableNetSaleProceeds.innerText = formatCurrency(netSaleProceedsValue); tableTotalOperatingExpenses.innerText = formatCurrency(totalOperatingExpensesValue); tableTotalProfit.innerText = formatCurrency(totalProfitValue); tableAnnualizedROI.innerText = formatPercentage(annualizedROIValue); updateChart(holdingPeriod, annualOperatingExpenses, purchasePrice, renovationCosts, sellingPrice, sellingCostsPercentage); } function resetResults() { mainROI.innerText = '–.–%'; totalInvestment.innerText = '–'; totalProfit.innerText = '–'; netSaleProceeds.innerText = '–'; assumptionPurchasePrice.innerText = '–'; assumptionRenovationCosts.innerText = '–'; assumptionSellingPrice.innerText = '–'; assumptionHoldingPeriod.innerText = '–'; assumptionAnnualOperatingExpenses.innerText = '–'; assumptionSellingCostsPercentage.innerText = '–%'; tablePurchasePrice.innerText = '–'; tableRenovationCosts.innerText = '–'; tableTotalInvestment.innerText = '–'; tableGrossSaleProceeds.innerText = '–'; tableSellingCosts.innerText = '–'; tableNetSaleProceeds.innerText = '–'; tableTotalOperatingExpenses.innerText = '–'; tableTotalProfit.innerText = '–'; tableAnnualizedROI.innerText = '–'; if (chartContext) { chartContext.clearRect(0, 0, chartContext.canvas.width, chartContext.canvas.height); } } function resetForm() { purchasePriceInput.value = "; renovationCostsInput.value = "; sellingPriceInput.value = "; holdingPeriodInput.value = '5'; annualOperatingExpensesInput.value = "; sellingCostsPercentageInput.value = '6'; purchasePriceError.innerText = "; purchasePriceError.classList.remove('visible'); renovationCostsError.innerText = "; renovationCostsError.classList.remove('visible'); sellingPriceError.innerText = "; sellingPriceError.classList.remove('visible'); holdingPeriodError.innerText = "; holdingPeriodError.classList.remove('visible'); annualOperatingExpensesError.innerText = "; annualOperatingExpensesError.classList.remove('visible'); sellingCostsPercentageError.innerText = "; sellingCostsPercentageError.classList.remove('visible'); purchasePriceInput.style.borderColor = '#ddd'; renovationCostsInput.style.borderColor = '#ddd'; sellingPriceInput.style.borderColor = '#ddd'; holdingPeriodInput.style.borderColor = '#ddd'; annualOperatingExpensesInput.style.borderColor = '#ddd'; sellingCostsPercentageInput.style.borderColor = '#ddd'; resetResults(); } function copyResults() { var resultsText = "Real Estate ROI Calculation Results:\n\n"; resultsText += "ROI: " + mainROI.innerText + "\n"; resultsText += "Total Investment: " + totalInvestment.innerText + "\n"; resultsText += "Total Profit: " + totalProfit.innerText + "\n"; resultsText += "Net Sale Proceeds: " + netSaleProceeds.innerText + "\n\n"; resultsText += "Key Assumptions:\n"; resultsText += "Purchase Price: " + assumptionPurchasePrice.innerText + "\n"; resultsText += "Renovation Costs: " + assumptionRenovationCosts.innerText + "\n"; resultsText += "Selling Price: " + assumptionSellingPrice.innerText + "\n"; resultsText += "Holding Period: " + assumptionHoldingPeriod.innerText + " years\n"; resultsText += "Annual Operating Expenses: " + assumptionAnnualOperatingExpenses.innerText + "\n"; resultsText += "Selling Costs: " + assumptionSellingCostsPercentage.innerText + "\n\n"; resultsText += "Investment Breakdown:\n"; resultsText += "Table Purchase Price: " + tablePurchasePrice.innerText + "\n"; resultsText += "Table Renovation Costs: " + tableRenovationCosts.innerText + "\n"; resultsText += "Table Total Investment: " + tableTotalInvestment.innerText + "\n"; resultsText += "Table Gross Sale Proceeds: " + tableGrossSaleProceeds.innerText + "\n"; resultsText += "Table Selling Costs: " + tableSellingCosts.innerText + "\n"; resultsText += "Table Net Sale Proceeds: " + tableNetSaleProceeds.innerText + "\n"; resultsText += "Table Total Operating Expenses: " + tableTotalOperatingExpenses.innerText + "\n"; resultsText += "Table Total Profit: " + tableTotalProfit.innerText + "\n"; resultsText += "Table Annualized ROI: " + tableAnnualizedROI.innerText + "\n"; var textArea = document.createElement("textarea"); textArea.value = resultsText; textArea.style.position = "fixed"; textArea.style.left = "-9999px"; document.body.appendChild(textArea); textArea.focus(); textArea.select(); try { var successful = document.execCommand('copy'); var msg = successful ? 'Results copied!' : 'Copying failed!'; console.log(msg); // Optionally show a temporary message to the user var copyButton = document.querySelector('button.secondary'); var originalText = copyButton.innerText; copyButton.innerText = msg; setTimeout(function() { copyButton.innerText = originalText; }, 2000); } catch (err) { console.log('Oops, unable to copy'); } document.body.removeChild(textArea); } function updateChart(holdingPeriod, annualOperatingExpenses, purchasePrice, renovationCosts, sellingPrice, sellingCostsPercentage) { var canvas = document.getElementById('roiChart'); if (!chartContext) { chartContext = canvas.getContext('2d'); } var maxYears = Math.max(holdingPeriod, 10); // Show at least 10 years or the input holding period var years = []; var rois = []; var annualizedRois = []; for (var i = 1; i <= maxYears; i++) { years.push(i); var currentTotalInvestment = purchasePrice + renovationCosts; var currentSellingCosts = sellingPrice * (sellingCostsPercentage / 100); var currentNetSaleProceeds = sellingPrice – currentSellingCosts; var currentTotalOperatingExpenses = annualOperatingExpenses * i; var currentTotalProfit = currentNetSaleProceeds – currentTotalInvestment – currentTotalOperatingExpenses; var currentROI = (currentTotalInvestment === 0) ? 0 : (currentTotalProfit / currentTotalInvestment) * 100; var currentAnnualizedROI = (currentROI === 0) ? 0 : (Math.pow(1 + (currentROI / 100), 1 / i) – 1) * 100; rois.push(currentROI); annualizedRois.push(currentAnnualizedROI); } // Ensure chart data doesn't go beyond the actual holding period if it's short if (holdingPeriod < maxYears) { years = years.slice(0, holdingPeriod); rois = rois.slice(0, holdingPeriod); annualizedRois = annualizedRois.slice(0, holdingPeriod); } var chartData = { labels: years, datasets: [{ label: 'Total ROI (%)', data: rois, borderColor: 'var(–primary-color)', backgroundColor: 'rgba(0, 74, 153, 0.1)', fill: true, tension: 0.1, yAxisID: 'y-axis-roi' }, { label: 'Annualized ROI (%)', data: annualizedRois, borderColor: 'var(–success-color)', backgroundColor: 'rgba(40, 167, 69, 0.1)', fill: true, tension: 0.1, yAxisID: 'y-axis-annualized' }] }; var maxY = Math.max(…rois, …annualizedRois); var minY = Math.min(…rois, …annualizedRois); minY = Math.min(minY, -20); // Ensure chart can show negative ROI maxY = Math.max(maxY, 20); // Ensure chart shows reasonable positive range if (roiChart) { roiChart.data = chartData; roiChart.options.scales.y.max = maxY + 10; // Add some padding roiChart.options.scales.y.min = minY – 10; // Add some padding roiChart.update(); } else { roiChart = new Chart(chartContext, { type: 'line', data: chartData, options: { responsive: true, maintainAspectRatio: false, scales: { x: { title: { display: true, text: 'Holding Period (Years)' } }, 'y-axis-roi': { type: 'linear', position: 'left', title: { display: true, text: 'Total ROI (%)' }, max: maxY + 10, min: minY – 10 }, 'y-axis-annualized': { type: 'linear', position: 'right', title: { display: true, text: 'Annualized ROI (%)' }, max: maxY + 10, min: minY – 10, grid: { drawOnChartArea: false, // only want the grid lines for one axis to show up } } }, plugins: { tooltip: { mode: 'index', intersect: false, }, legend: { position: 'top', } }, hover: { mode: 'nearest', intersect: true } } }); } } // Initial calculation on load if inputs have default values document.addEventListener('DOMContentLoaded', function() { // Check if default values exist and calculate if (holdingPeriodInput.value && annualOperatingExpensesInput.value && purchasePriceInput.value && renovationCostsInput.value && sellingPriceInput.value && sellingCostsPercentageInput.value) { calculateROI(); } else { resetResults(); // Ensure results are cleared if no defaults } }); // Add event listeners for real-time updates var inputs = [purchasePriceInput, renovationCostsInput, sellingPriceInput, holdingPeriodInput, annualOperatingExpensesInput, sellingCostsPercentageInput]; inputs.forEach(function(input) { input.addEventListener('input', function() { // Only calculate if all required fields have some value var allInputsFilled = inputs.every(function(inp) { return inp.value.trim() !== ''; }); if (allInputsFilled) { calculateROI(); } else { resetResults(); // Clear results if any input is cleared } }); }); // Initialize chart context and potentially draw initial chart if defaults are set var canvas = document.getElementById('roiChart'); if (canvas) { chartContext = canvas.getContext('2d'); }

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