Calculator for Rental Property

Analyze Your Investment's Profitability

Rental Property Investment Analysis

Rental Property Financial Summary

Metric	Value	Description
Purchase Price	—	Total cost to acquire the property.
Down Payment	—	Your initial cash investment.
Loan Amount	—	Amount financed.
Monthly Mortgage (P&I)	—	Principal and Interest payment.
Gross Annual Rent	—	Total potential rent income per year.
Vacancy Loss	—	Estimated income lost due to vacancies.
Effective Gross Income	—	Gross Rent minus Vacancy Loss.
Operating Expenses	—	Taxes, insurance, maintenance, management, other.
Net Operating Income (NOI)	—	Effective Gross Income minus Operating Expenses.
Annual Cash Flow	—	NOI minus Mortgage Payment. Your take-home profit.
Initial Investment	—	Down Payment + Closing Costs (simplified).
Cash-on-Cash Return	—	(Annual Cash Flow / Initial Investment) * 100.
Capitalization Rate (Cap Rate)	—	(NOI / Purchase Price) * 100. Measures unleveraged return.

What is a Rental Property Calculator?

A rental property calculator is a powerful financial tool designed to help real estate investors estimate the potential profitability of a rental property. It takes various inputs related to the property's acquisition costs, ongoing expenses, and expected rental income to project key financial metrics. This calculator is essential for anyone looking to invest in real estate, whether they are seasoned investors or newcomers to the market. It provides a quantitative basis for decision-making, allowing you to compare different investment opportunities and understand the financial implications before committing capital. By using a rental property calculator, you can move beyond gut feelings and make data-driven choices.

Who Should Use a Rental Property Calculator?

• Aspiring Real Estate Investors: Individuals new to property investment who need to understand the basic financial viability of potential deals.
• Experienced Landlords: Investors looking to optimize their existing portfolios or evaluate new acquisitions with greater precision.
• Real Estate Agents & Wholesalers: Professionals who need to quickly assess property potential for clients or deals.
• Financial Planners: Advisors helping clients explore real estate as an investment vehicle.

Common Misconceptions about Rental Property Investing

One common misconception is that rental properties are purely passive income. In reality, they require active management, whether directly or through a property manager. Another myth is that you need a large down payment for every deal; creative financing and partnerships can sometimes reduce upfront capital. Many also underestimate the costs associated with maintenance, repairs, and unexpected vacancies. A thorough rental property calculator helps to account for these often-overlooked expenses, providing a more realistic financial picture.

Rental Property Calculator Formula and Mathematical Explanation

The core of a rental property calculator revolves around calculating cash flow and return on investment. Here's a breakdown of the key formulas:

1. Mortgage Payment (Principal & Interest)

This is typically calculated using the standard annuity formula:

M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1]</code

Where:

• M = Monthly Mortgage Payment
• P = Principal Loan Amount
• i = Monthly Interest Rate (Annual Rate / 12)
• n = Total Number of Payments (Loan Term in Years * 12)

2. Gross Annual Rental Income

Gross Annual Rental Income = Monthly Rent * 12

3. Vacancy Loss

Vacancy Loss = Gross Annual Rental Income * (Annual Vacancy Rate / 100)

4. Effective Gross Income (EGI)

EGI = Gross Annual Rental Income - Vacancy Loss

5. Total Annual Operating Expenses

This includes all costs of owning and operating the property, excluding mortgage principal and interest.

Total Operating Expenses = Annual Property Taxes + Annual Insurance + Annual Maintenance + (Gross Annual Rental Income * Annual Management Fees / 100) + Other Annual Expenses

6. Net Operating Income (NOI)

NOI represents the property's profitability before considering financing costs.

NOI = EGI - Total Operating Expenses

7. Annual Cash Flow

This is the actual profit you take home after all expenses, including the mortgage payment.

Annual Cash Flow = NOI - (Monthly Mortgage Payment * 12)

8. Initial Investment

This is the total cash you put into the deal upfront. For simplicity, we often use the down payment, but ideally, it includes closing costs.

Initial Investment = Down Payment (+ Closing Costs, if factored)

9. Cash-on-Cash Return (CoC)

Measures the return on the actual cash invested.

CoC Return (%) = (Annual Cash Flow / Initial Investment) * 100

10. Capitalization Rate (Cap Rate)

Measures the unleveraged rate of return based on the property's income potential relative to its price.

Cap Rate (%) = (NOI / Purchase Price) * 100

Variables Table

Rental Property Calculator Variables

Variable	Meaning	Unit	Typical Range
Purchase Price	Total cost to acquire the property.	Currency ($)	$50,000 - $1,000,000+
Down Payment	Initial cash paid by the buyer.	Currency ($)	10% - 30% of Purchase Price
Loan Amount	Amount borrowed for the purchase.	Currency ($)	Purchase Price - Down Payment
Loan Interest Rate	Annual interest charged on the loan.	Percent (%)	3% - 8%
Loan Term	Duration of the mortgage.	Years	15, 20, 30
Annual Property Taxes	Yearly tax assessment.	Currency ($)	1% - 3% of Purchase Price
Annual Insurance	Yearly cost of homeowner's insurance.	Currency ($)	$500 - $2,500+
Annual Maintenance	Budget for repairs and upkeep.	Currency ($)	1% - 2% of Purchase Price, or fixed amount
Annual Vacancy Rate	Percentage of time property is vacant.	Percent (%)	3% - 10%
Annual Management Fees	Percentage of gross rent for management.	Percent (%)	6% - 12%
Estimated Monthly Rent	Projected rent income per month.	Currency ($)	Varies by market
Other Annual Expenses	Miscellaneous costs (utilities, HOA, etc.).	Currency ($)	$100 - $1,000+
NOI	Net Operating Income.	Currency ($)	Varies
Annual Cash Flow	Profit after all expenses and mortgage.	Currency ($)	Varies
Initial Investment	Total cash out of pocket.	Currency ($)	Down Payment + Closing Costs
Cash-on-Cash Return	Return on cash invested.	Percent (%)	5% - 15%+
Cap Rate	Unleveraged return on property value.	Percent (%)	4% - 10%+

Practical Examples (Real-World Use Cases)

Let's illustrate with two scenarios using the rental property calculator:

Example 1: Single-Family Home in Suburbia

Scenario: An investor buys a single-family home for $300,000. They put down $60,000 (20%) and finance the rest with a 30-year mortgage at 5% interest. Annual property taxes are $3,600, insurance is $1,200, maintenance is budgeted at $3,000, vacancy at 5%, management fees at 8%, and they expect to rent it for $2,200 per month. Other annual expenses are $400.

Inputs:

• Purchase Price: $300,000
• Down Payment: $60,000
• Loan Amount: $240,000
• Loan Interest Rate: 5%
• Loan Term: 30 years
• Annual Property Taxes: $3,600
• Annual Insurance: $1,200
• Annual Maintenance: $3,000
• Annual Vacancy Rate: 5%
• Annual Management Fees: 8%
• Estimated Monthly Rent: $2,200
• Other Annual Expenses: $400

Calculated Results (Illustrative):

• Monthly Mortgage (P&I): ~$1,288
• Gross Annual Rental Income: $26,400
• Vacancy Loss: $1,320
• Effective Gross Income: $25,080
• Total Operating Expenses: $3,600 + $1,200 + $3,000 + ($26,400 * 0.08) + $400 = $10,320
• Net Operating Income (NOI): $25,080 - $10,320 = $14,760
• Annual Cash Flow: $14,760 - ($1,288 * 12) = $14,760 - $15,456 = -$696 (Slight negative cash flow)
• Initial Investment: $60,000
• Cash-on-Cash Return: (-$696 / $60,000) * 100 = -1.16%
• Cap Rate: ($14,760 / $300,000) * 100 = 4.92%

Interpretation: This property, based on these conservative estimates, shows a slightly negative cash flow in the first year. The Cap Rate of 4.92% is modest. The investor might reconsider the rent price, negotiate the purchase price, or look for ways to reduce expenses. Appreciation and principal paydown would contribute to overall wealth building, but immediate cash flow is minimal.

Example 2: Small Multi-Family Duplex

Scenario: An investor purchases a duplex for $400,000 with a $100,000 down payment (25%) and finances $300,000 at 4.8% for 30 years. Annual taxes: $4,800, insurance: $1,800, maintenance: $4,000, vacancy: 4%, management: 10%, and rents are $1,500/month per unit ($3,000 total monthly). Other expenses: $600.

Inputs:

• Purchase Price: $400,000
• Down Payment: $100,000
• Loan Amount: $300,000
• Loan Interest Rate: 4.8%
• Loan Term: 30 years
• Annual Property Taxes: $4,800
• Annual Insurance: $1,800
• Annual Maintenance: $4,000
• Annual Vacancy Rate: 4%
• Annual Management Fees: 10%
• Estimated Monthly Rent: $3,000
• Other Annual Expenses: $600

Calculated Results (Illustrative):

• Monthly Mortgage (P&I): ~$1,575
• Gross Annual Rental Income: $36,000
• Vacancy Loss: $1,440
• Effective Gross Income: $34,560
• Total Operating Expenses: $4,800 + $1,800 + $4,000 + ($36,000 * 0.10) + $600 = $15,000
• Net Operating Income (NOI): $34,560 - $15,000 = $19,560
• Annual Cash Flow: $19,560 - ($1,575 * 12) = $19,560 - $18,900 = $660
• Initial Investment: $100,000
• Cash-on-Cash Return: ($660 / $100,000) * 100 = 0.66%
• Cap Rate: ($19,560 / $400,000) * 100 = 4.89%

Interpretation: This duplex provides a small positive cash flow of $660 annually. The Cap Rate is similar to the first example. While the immediate cash flow is low, the investor might find this acceptable given the potential for appreciation and principal paydown, especially with a higher down payment reducing leverage. This example highlights the importance of accurate expense estimations and market rent analysis when using a rental property calculator.

How to Use This Rental Property Calculator

Our rental property calculator is designed for ease of use. Follow these steps to get accurate investment insights:

1. Gather Property Information: Collect all relevant data for the property you are considering. This includes the purchase price, down payment amount, loan details (interest rate, term), estimated operating expenses (taxes, insurance, maintenance, management fees), and projected monthly rent.
2. Input the Data: Enter each piece of information into the corresponding field in the calculator. Ensure you use accurate figures. For percentages (like vacancy rate or management fees), enter the number (e.g., 5 for 5%).
3. Click Calculate: Once all fields are populated, click the "Calculate" button.
4. Review the Results: The calculator will display the primary result (Net Operating Income) prominently, along with key intermediate values like Gross Rental Income, Total Operating Expenses, Annual Cash Flow, Cash-on-Cash Return, and Cap Rate. The table provides a detailed breakdown.
5. Interpret the Output:
   • NOI: A higher NOI indicates better profitability before financing.
   • Annual Cash Flow: This is your pocket profit after all expenses and mortgage payments. Positive cash flow is crucial for most investors.
   • Cash-on-Cash Return: Shows how much return you're getting on the actual cash you invested. Higher is generally better.
   • Cap Rate: Useful for comparing properties independent of financing. A higher Cap Rate suggests a potentially better return relative to price.
6. Use the Chart and Table: The chart visually compares income and expenses, while the table offers a comprehensive summary for easy reference and sharing.
7. Reset or Copy: Use the "Reset" button to clear the form and start over. Use "Copy Results" to save or share the calculated metrics and assumptions.

Decision-Making Guidance: Use the results to compare potential properties. Aim for investments with positive cash flow, a healthy Cash-on-Cash return, and a Cap Rate that meets your investment goals. Remember that this calculator provides estimates; always perform thorough due diligence.

Key Factors That Affect Rental Property Calculator Results

Several factors significantly influence the output of a rental property calculator. Understanding these is key to accurate analysis:

1. Market Rents: The accuracy of your projected monthly rent is paramount. Overestimating rents leads to inflated income projections, while underestimating can make a good deal look bad. Research comparable properties thoroughly.
2. Vacancy Rate: This accounts for periods when the property is unoccupied. Higher vacancy rates directly reduce effective gross income. Market conditions, property type, and location influence this rate.
3. Operating Expenses:
   • Property Taxes: Can fluctuate based on reassessments and local tax rates.
   • Insurance: Premiums vary based on coverage, location (risk factors like floods or hurricanes), and property condition.
   • Maintenance & Repairs: Older properties or those in harsh climates require higher budgets. Unexpected major repairs (roof, HVAC) can significantly impact a single year's cash flow.
   • Property Management Fees: If you hire a manager, this percentage directly reduces your net income. Factor in the value they provide (tenant screening, maintenance coordination).
4. Interest Rates & Loan Terms: Higher interest rates and longer loan terms increase the monthly mortgage payment, reducing cash flow and cash-on-cash return, even if the NOI remains the same. This is a critical aspect of leverage.
5. Purchase Price & Initial Investment: A lower purchase price relative to income potential generally leads to a higher Cap Rate. A larger down payment (higher initial investment) reduces loan payments but also lowers the potential cash-on-cash return percentage if cash flow doesn't scale proportionally.
6. Capital Expenditures (CapEx): While not always explicitly in basic calculators, major improvements like a new roof, HVAC system, or significant renovations are crucial. These are separate from regular maintenance and can significantly impact long-term profitability and require separate budgeting.
7. Inflation and Appreciation: While not directly calculated in cash flow, inflation affects future operating costs and rents. Property appreciation is a key component of total return but isn't reflected in cash flow or Cap Rate calculations.
8. Tax Implications: Depreciation, mortgage interest deductions, and capital gains taxes can significantly alter the *after-tax* return on investment. This calculator focuses on pre-tax cash flow and return metrics.

Frequently Asked Questions (FAQ)

Q1: What is the most important metric from the rental property calculator?

A: While all metrics are important, Annual Cash Flow is often considered the most critical for immediate profitability. It represents the actual money you make (or lose) each year after all expenses. However, Cash-on-Cash Return and Cap Rate are vital for evaluating the efficiency and potential of the investment relative to your input and the property's value.

Q2: Can this calculator predict property appreciation?

A: No, this calculator focuses on the income-generating potential (cash flow and return on investment) based on current and projected figures. Property appreciation is speculative and depends on market conditions, location, and economic factors, which are not included in these calculations.

Q3: How accurate are the expense estimates?

A: The accuracy depends entirely on the quality of your input data. Use realistic, researched figures for your specific market. It's often wise to slightly overestimate expenses and underestimate income to be conservative.

Q4: What are "closing costs" and should I include them?

A: Closing costs are fees paid at the end of a real estate transaction (e.g., appraisal fees, title insurance, loan origination fees, legal fees). They are part of your initial investment. While this calculator simplifies 'Initial Investment' to the down payment, for a more precise Cash-on-Cash return, you should add estimated closing costs to the down payment figure.

Q5: What is a "good" Cap Rate or Cash-on-Cash Return?

A: This is subjective and depends on your investment goals, risk tolerance, and market. Generally, investors seek Cap Rates between 4-10% or higher, and Cash-on-Cash Returns of 8-15% or more. Lower returns might be acceptable if significant appreciation is expected or if the property is in a prime location with stable demand.

Q6: Does the calculator account for property management fees if I manage it myself?

A: If you self-manage, you can set the "Annual Property Management Fees" to 0%. However, it's wise to still budget a realistic amount for your time and effort, or potential future management costs.

Q7: How do I handle utilities?

A: If the landlord pays for utilities (e.g., water, sewer, trash in some multi-family situations), include those costs in "Other Annual Expenses". If tenants pay all utilities, they are not an expense for the landlord.

Q8: What if my loan interest rate is variable?

A: This calculator assumes a fixed-rate mortgage. For variable rates, you would need to input the current rate and understand how potential increases could affect your monthly payment and cash flow. Recalculating with different potential rates is advisable.

Q9: How does this relate to a mortgage affordability calculator?

A: A mortgage affordability calculator helps determine how much you can borrow based on income and debt. This rental property calculator assumes you've acquired the property and focuses on its income-generating potential and return on investment, including the mortgage payment as an expense.

var chartInstance = null; // Global variable to hold chart instance function getElement(id) { return document.getElementById(id); } function validateInput(inputId, errorId, minValue = null, maxValue = null) { var input = getElement(inputId); var errorElement = getElement(errorId); var value = parseFloat(input.value); var isValid = true; errorElement.innerText = ''; errorElement.classList.remove('visible'); input.style.borderColor = '#ced4da'; if (input.value === '') { errorElement.innerText = 'This field is required.'; isValid = false; } else if (isNaN(value)) { errorElement.innerText = 'Please enter a valid number.'; isValid = false; } else { if (minValue !== null && value maxValue) { errorElement.innerText = 'Value cannot be greater than ' + maxValue + '.'; isValid = false; } } if (!isValid) { errorElement.classList.add('visible'); input.style.borderColor = '#dc3545'; } return isValid; } function calculateMortgage(principal, annualRate, termYears) { var monthlyRate = annualRate / 100 / 12; var numberOfPayments = termYears * 12; var monthlyPayment = 0; if (monthlyRate > 0) { monthlyPayment = principal * (monthlyRate * Math.pow(1 + monthlyRate, numberOfPayments)) / (Math.pow(1 + monthlyRate, numberOfPayments) - 1); } else { monthlyPayment = principal / numberOfPayments; // Simple division if rate is 0 } return monthlyPayment; } function formatCurrency(amount) { if (isNaN(amount) || amount === null) return '--'; return '$' + amount.toFixed(2); } function formatPercent(amount) { if (isNaN(amount) || amount === null) return '--'; return amount.toFixed(2) + '%'; } function formatNumber(amount) { if (isNaN(amount) || amount === null) return '--'; return amount.toFixed(0); } function updateChart(grossRent, vacancyLoss, totalOperatingExpenses, mortgagePayment) { var ctx = getElement('rentalIncomeExpenseChart').getContext('2d'); // Destroy previous chart instance if it exists if (chartInstance) { chartInstance.destroy(); } var effectiveGrossIncome = grossRent - vacancyLoss; var totalExpensesWithMortgage = totalOperatingExpenses + (mortgagePayment * 12); chartInstance = new Chart(ctx, { type: 'bar', data: { labels: ['Income', 'Expenses'], datasets: [{ label: 'Effective Gross Income', data: [effectiveGrossIncome, 0], backgroundColor: 'rgba(40, 167, 69, 0.7)', // Green for income borderColor: 'rgba(40, 167, 69, 1)', borderWidth: 1 }, { label: 'Operating Expenses', data: [0, totalOperatingExpenses], backgroundColor: 'rgba(0, 123, 255, 0.7)', // Blue for operating expenses borderColor: 'rgba(0, 123, 255, 1)', borderWidth: 1 }, { label: 'Mortgage (P&I)', data: [0, mortgagePayment * 12], backgroundColor: 'rgba(255, 193, 7, 0.7)', // Yellow for mortgage borderColor: 'rgba(255, 193, 7, 1)', borderWidth: 1 }] }, options: { responsive: true, maintainAspectRatio: false, scales: { y: { beginAtZero: true, ticks: { callback: function(value) { return '$' + value.toLocaleString(); } } } }, plugins: { tooltip: { callbacks: { label: function(context) { var label = context.dataset.label || ''; if (label) { label += ': '; } if (context.parsed.y !== null) { label += '$' + context.parsed.y.toLocaleString(); } return label; } } } } } }); } function calculateRentalProperty() { // Clear previous errors var inputs = document.querySelectorAll('.input-group input[type="number"]'); inputs.forEach(function(input) { var errorId = input.id + 'Error'; var errorElement = getElement(errorId); if (errorElement) { errorElement.innerText = ''; errorElement.classList.remove('visible'); } input.style.borderColor = '#ced4da'; }); // Validate inputs var allValid = true; allValid &= validateInput('purchasePrice', 'purchasePriceError', 0); allValid &= validateInput('downPayment', 'downPaymentError', 0); allValid &= validateInput('loanInterestRate', 'loanInterestRateError', 0, 100); allValid &= validateInput('loanTerm', 'loanTermError', 1, 100); allValid &= validateInput('annualPropertyTaxes', 'annualPropertyTaxesError', 0); allValid &= validateInput('annualInsurance', 'annualInsuranceError', 0); allValid &= validateInput('annualMaintenance', 'annualMaintenanceError', 0); allValid &= validateInput('annualVacancy', 'annualVacancyError', 0, 100); allValid &= validateInput('annualManagementFees', 'annualManagementFeesError', 0, 100); allValid &= validateInput('annualRent', 'annualRentError', 0); allValid &= validateInput('otherAnnualExpenses', 'otherAnnualExpensesError', 0); if (!allValid) { getElement('resultsContainer').classList.add('hidden'); getElement('noResultsMessage').classList.remove('hidden'); return; } // Get values var purchasePrice = parseFloat(getElement('purchasePrice').value); var downPayment = parseFloat(getElement('downPayment').value); var loanInterestRate = parseFloat(getElement('loanInterestRate').value); var loanTerm = parseFloat(getElement('loanTerm').value); var annualPropertyTaxes = parseFloat(getElement('annualPropertyTaxes').value); var annualInsurance = parseFloat(getElement('annualInsurance').value); var annualMaintenance = parseFloat(getElement('annualMaintenance').value); var annualVacancyRate = parseFloat(getElement('annualVacancy').value); var annualManagementFees = parseFloat(getElement('annualManagementFees').value); var monthlyRent = parseFloat(getElement('annualRent').value); var otherAnnualExpenses = parseFloat(getElement('otherAnnualExpenses').value); // Calculations var loanAmount = purchasePrice - downPayment; getElement('loanAmount').value = loanAmount.toFixed(2); var monthlyMortgagePayment = calculateMortgage(loanAmount, loanInterestRate, loanTerm); var annualMortgagePayment = monthlyMortgagePayment * 12; var grossRentalIncome = monthlyRent * 12; var vacancyLoss = grossRentalIncome * (annualVacancyRate / 100); var effectiveGrossIncome = grossRentalIncome - vacancyLoss; var managementFeesAmount = grossRentalIncome * (annualManagementFees / 100); var totalOperatingExpenses = annualPropertyTaxes + annualInsurance + annualMaintenance + managementFeesAmount + otherAnnualExpenses; var netOperatingIncome = effectiveGrossIncome - totalOperatingExpenses; var annualCashFlow = netOperatingIncome - annualMortgagePayment; var initialInvestment = downPayment; // Simplified: excluding closing costs for this example var cashOnCashReturn = (initialInvestment > 0) ? (annualCashFlow / initialInvestment) * 100 : 0; var capRate = (purchasePrice > 0) ? (netOperatingIncome / purchasePrice) * 100 : 0; // Update results display getElement('netOperatingIncome').innerText = formatCurrency(netOperatingIncome); getElement('grossRentalIncome').innerText = formatCurrency(grossRentalIncome); getElement('totalOperatingExpenses').innerText = formatCurrency(totalOperatingExpenses); getElement('monthlyMortgagePayment').innerText = formatCurrency(monthlyMortgagePayment); getElement('annualCashFlow').innerText = formatCurrency(annualCashFlow); getElement('cashOnCashReturn').innerText = formatPercent(cashOnCashReturn); getElement('capRate').innerText = formatPercent(capRate); getElement('initialInvestment').innerText = formatCurrency(initialInvestment); getElement('totalAnnualExpensesWithPI').innerText = formatCurrency(annualMortgagePayment + totalOperatingExpenses); var ltv = (purchasePrice > 0) ? (loanAmount / purchasePrice) * 100 : 0; getElement('loanToValueRatio').innerText = formatPercent(ltv); // Update summary table getElement('summaryPurchasePrice').innerText = formatCurrency(purchasePrice); getElement('summaryDownPayment').innerText = formatCurrency(downPayment); getElement('summaryLoanAmount').innerText = formatCurrency(loanAmount); getElement('summaryMonthlyMortgage').innerText = formatCurrency(monthlyMortgagePayment); getElement('summaryGrossRent').innerText = formatCurrency(grossRentalIncome); getElement('summaryVacancyLoss').innerText = formatCurrency(vacancyLoss); getElement('summaryEffectiveGrossIncome').innerText = formatCurrency(effectiveGrossIncome); getElement('summaryOperatingExpenses').innerText = formatCurrency(totalOperatingExpenses); getElement('summaryNOI').innerText = formatCurrency(netOperatingIncome); getElement('summaryCashFlow').innerText = formatCurrency(annualCashFlow); getElement('summaryInitialInvestment').innerText = formatCurrency(initialInvestment); getElement('summaryCashOnCash').innerText = formatPercent(cashOnCashReturn); getElement('summaryCapRate').innerText = formatPercent(capRate); getElement('resultsContainer').classList.remove('hidden'); getElement('noResultsMessage').classList.add('hidden'); // Update Chart updateChart(grossRentalIncome, vacancyLoss, totalOperatingExpenses, monthlyMortgagePayment); } function resetRentalPropertyForm() { getElement('purchasePrice').value = '250000'; getElement('downPayment').value = '50000'; getElement('loanInterestRate').value = '4.5'; getElement('loanTerm').value = '30'; getElement('annualPropertyTaxes').value = '3000'; getElement('annualInsurance').value = '1200'; getElement('annualMaintenance').value = '1500'; getElement('annualVacancy').value = '5'; getElement('annualManagementFees').value = '8'; getElement('annualRent').value = '1800'; getElement('otherAnnualExpenses').value = '500'; // Clear errors and results var inputs = document.querySelectorAll('.input-group input[type="number"], .input-group input[type="text"], .input-group select'); inputs.forEach(function(input) { var errorId = input.id + 'Error'; var errorElement = getElement(errorId); if (errorElement) { errorElement.innerText = ''; errorElement.classList.remove('visible'); } input.style.borderColor = '#ced4da'; }); getElement('loanAmount').value = ''; getElement('resultsContainer').classList.add('hidden'); getElement('noResultsMessage').classList.remove('hidden'); if (chartInstance) { chartInstance.destroy(); chartInstance = null; } // Clear table content var summaryCells = document.querySelectorAll('#summaryTableBody td'); summaryCells.forEach(function(cell) { cell.innerText = '--'; }); } function copyRentalResults() { var resultsText = "Rental Property Analysis Results:\n\n"; resultsText += "Primary Result:\n"; resultsText += "Net Operating Income: " + getElement('netOperatingIncome').innerText + "\n"; resultsText += "------------------------------------\n\n"; resultsText += "Key Metrics:\n"; resultsText += "Gross Annual Rental Income: " + getElement('grossRentalIncome').innerText + "\n"; resultsText += "Total Annual Operating Expenses: " + getElement('totalOperatingExpenses').innerText + "\n"; resultsText += "Monthly Mortgage Payment: " + getElement('monthlyMortgagePayment').innerText + "\n"; resultsText += "Annual Cash Flow: " + getElement('annualCashFlow').innerText + "\n"; resultsText += "Cash-on-Cash Return: " + getElement('cashOnCashReturn').innerText + "\n"; resultsText += "Capitalization Rate (Cap Rate): " + getElement('capRate').innerText + "\n"; resultsText += "\n"; resultsText += "Key Assumptions:\n"; resultsText += "Initial Investment: " + getElement('initialInvestment').innerText + "\n"; resultsText += "Total Annual Expenses (incl. P&I): " + getElement('totalAnnualExpensesWithPI').innerText + "\n"; resultsText += "Loan-to-Value Ratio: " + getElement('loanToValueRatio').innerText + "\n"; resultsText += "\n"; resultsText += "Formula Used:\n"; resultsText += getElement('resultsContainer').querySelector('.formula-explanation').innerText.replace('', '').replace('', '') + "\n"; // Use a temporary textarea to copy text var textArea = document.createElement("textarea"); textArea.value = resultsText; 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 ? 'Results copied to clipboard!' : 'Copying failed!'; console.log(msg); // Optionally show a temporary message to the user alert(msg); } catch (err) { console.log('Unable to copy results.', err); alert('Copying failed. Please copy manually.'); } document.body.removeChild(textArea); } // Initial calculation on load if default values are present document.addEventListener('DOMContentLoaded', function() { // Check if default values exist before calculating if (getElement('purchasePrice').value && getElement('downPayment').value && getElement('loanInterestRate').value && getElement('loanTerm').value && getElement('annualPropertyTaxes').value && getElement('annualInsurance').value && getElement('annualMaintenance').value && getElement('annualVacancy').value && getElement('annualManagementFees').value && getElement('annualRent').value && getElement('otherAnnualExpenses').value) { calculateRentalProperty(); } });