:root {
–primary-color: #004a99;
–success-color: #28a745;
–background-color: #f8f9fa;
–text-color: #333;
–border-color: #ddd;
–card-bg: #fff;
–shadow: 0 2px 5px rgba(0,0,0,0.1);
}
body {
font-family: ‘Segoe UI’, Tahoma, Geneva, Verdana, sans-serif;
background-color: var(–background-color);
color: var(–text-color);
margin: 0;
padding: 0;
display: flex;
flex-direction: column;
align-items: center;
line-height: 1.6;
}
header {
background-color: var(–primary-color);
color: white;
padding: 20px 0;
text-align: center;
width: 100%;
}
header h1 {
margin: 0;
font-size: 2.5em;
}
main {
width: 100%;
max-width: 1100px;
margin: 20px auto;
padding: 0 15px;
box-sizing: border-box;
}
.loan-calc-container {
background-color: var(–card-bg);
padding: 30px;
border-radius: 8px;
box-shadow: var(–shadow);
margin-bottom: 30px;
}
.input-group {
margin-bottom: 20px;
text-align: left;
}
.input-group label {
display: block;
margin-bottom: 8px;
font-weight: bold;
color: var(–primary-color);
}
.input-group input[type=”number”],
.input-group input[type=”text”],
.input-group select {
width: 100%;
padding: 12px;
border: 1px solid var(–border-color);
border-radius: 4px;
box-sizing: border-box;
font-size: 1em;
}
.input-group input[type=”number”]:focus,
.input-group input[type=”text”]:focus,
.input-group select:focus {
outline: none;
border-color: var(–primary-color);
box-shadow: 0 0 0 2px rgba(0, 74, 153, 0.2);
}
.input-group .helper-text {
font-size: 0.85em;
color: #666;
margin-top: 5px;
}
.error-message {
color: red;
font-size: 0.8em;
margin-top: 5px;
min-height: 1.2em; /* Prevent layout shifts */
}
.button-group {
display: flex;
justify-content: space-between;
margin-top: 25px;
gap: 10px;
}
.btn {
padding: 12px 25px;
border: none;
border-radius: 5px;
cursor: pointer;
font-size: 1em;
font-weight: bold;
transition: background-color 0.3s ease;
text-align: center;
flex: 1; /* Distribute space evenly */
}
.btn-primary {
background-color: var(–primary-color);
color: white;
}
.btn-primary:hover {
background-color: #003366;
}
.btn-secondary {
background-color: #6c757d;
color: white;
}
.btn-secondary:hover {
background-color: #5a6268;
}
.btn-success {
background-color: var(–success-color);
color: white;
flex: 0 0 auto; /* Don’t grow or shrink */
}
.btn-success:hover {
background-color: #218838;
}
.results-container {
background-color: var(–card-bg);
padding: 30px;
border-radius: 8px;
box-shadow: var(–shadow);
margin-top: 30px;
text-align: center;
}
.results-container h3 {
color: var(–primary-color);
margin-bottom: 20px;
}
.main-result {
font-size: 2.8em;
font-weight: bold;
color: var(–primary-color);
margin: 15px 0;
padding: 15px;
background-color: #e7f3ff;
border-radius: 5px;
display: inline-block;
}
.intermediate-results div {
margin-bottom: 10px;
font-size: 1.1em;
}
.intermediate-results span {
font-weight: bold;
color: var(–primary-color);
}
.formula-explanation {
font-size: 0.9em;
color: #555;
margin-top: 20px;
border-top: 1px solid var(–border-color);
padding-top: 15px;
}
table {
width: 100%;
border-collapse: collapse;
margin-top: 25px;
overflow-x: auto; /* Makes table horizontally scrollable on mobile */
display: block; /* Needed for overflow-x to work correctly */
white-space: nowrap; /* Prevents content wrapping */
}
th, td {
border: 1px solid var(–border-color);
padding: 10px 15px;
text-align: center;
}
th {
background-color: var(–primary-color);
color: white;
font-weight: bold;
}
tr:nth-child(even) {
background-color: #f2f2f2;
}
caption {
font-size: 1.1em;
font-weight: bold;
color: var(–primary-color);
margin-top: 20px;
margin-bottom: 10px;
caption-side: top;
text-align: left;
}
.chart-container {
margin-top: 30px;
background-color: var(–card-bg);
padding: 20px;
border-radius: 8px;
box-shadow: var(–shadow);
text-align: center;
}
canvas {
max-width: 100%;
height: auto !important; /* Override inline styles from charting lib if used, though we’re not */
display: block; /* Helps with responsiveness */
margin: 0 auto; /* Center the canvas */
}
.article-section {
background-color: var(–card-bg);
padding: 30px;
border-radius: 8px;
box-shadow: var(–shadow);
margin-top: 30px;
text-align: left;
}
.article-section h2 {
color: var(–primary-color);
border-bottom: 2px solid var(–primary-color);
padding-bottom: 10px;
margin-bottom: 20px;
font-size: 1.8em;
}
.article-section h3 {
color: var(–primary-color);
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-list dt {
font-weight: bold;
color: var(–primary-color);
margin-top: 15px;
margin-bottom: 5px;
}
.faq-list dd {
margin-left: 20px;
margin-bottom: 10px;
}
.internal-links {
margin-top: 30px;
background-color: var(–card-bg);
padding: 30px;
border-radius: 8px;
box-shadow: var(–shadow);
}
.internal-links h3 {
color: var(–primary-color);
margin-bottom: 20px;
text-align: center;
}
.internal-links ul {
list-style: none;
padding: 0;
margin: 0;
display: flex;
flex-wrap: wrap;
justify-content: center;
gap: 15px;
}
.internal-links li {
background-color: #e7f3ff;
padding: 10px 15px;
border-radius: 5px;
border: 1px solid #cce0ff;
}
.internal-links a {
text-decoration: none;
color: var(–primary-color);
font-weight: bold;
}
.internal-links a:hover {
text-decoration: underline;
}
footer {
text-align: center;
padding: 20px;
margin-top: 30px;
color: #777;
font-size: 0.9em;
width: 100%;
}
/* Responsive adjustments */
@media (max-width: 768px) {
header h1 {
font-size: 1.8em;
}
.loan-calc-container, .results-container, .article-section, .chart-container, .internal-links {
padding: 20px;
}
.btn {
padding: 10px 15px;
font-size: 0.95em;
}
.button-group {
flex-direction: column;
gap: 10px;
}
.btn {
flex: none; /* Remove flex grow/shrink in column layout */
width: 100%; /* Make buttons full width */
}
.main-result {
font-size: 2.2em;
}
table {
display: block; /* Ensure scrollable behavior */
overflow-x: auto;
white-space: nowrap;
}
}
RV Loan Payment Calculator
Estimate your monthly RV financing costs accurately.
Calculate Your Monthly RV Payment
Enter the details of your potential RV loan to see your estimated monthly payments.
1 Year
3 Years
5 Years
7 Years
10 Years
15 Years
20 Years
Estimated RV Loan Payments
Loan Amortization Chart
What is an RV Loan Payment Calculator?
An RV loan payment calculator is a digital tool designed to help prospective RV buyers estimate their monthly financing costs. By inputting key details about the loan, such as the RV’s price, the interest rate, the loan term, and any down payment, the calculator quickly provides an estimated monthly payment. This tool is essential for anyone considering purchasing a recreational vehicle through financing, allowing them to budget effectively and understand the long-term financial commitment involved in owning an RV. It simplifies the complex calculations associated with amortizing loans, making financial planning more accessible.
Anyone planning to finance an RV, from first-time buyers to experienced RV enthusiasts looking to upgrade, can benefit from using an RV loan payment calculator. It’s particularly useful when comparing different RV models, dealerships, or loan offers. By seeing how variables like interest rates or loan terms impact monthly payments, buyers can make more informed decisions and negotiate better terms. It helps answer the crucial question: “Can I afford this RV?” by translating a large purchase price into a manageable monthly figure.
Common misconceptions about RV loans and payments include assuming that all loans are the same, that a higher interest rate only slightly increases payments, or that the advertised price is the final amount paid. Many people underestimate the total cost of ownership, not factoring in interest over many years. Furthermore, understanding the difference between simple interest and amortizing loans is crucial, as most RV loans are amortizing. This calculator helps demystify these aspects by showing the exact breakdown of principal and interest payments over time.
RV Loan Payment Formula and Mathematical Explanation
The core of an RV loan payment calculator relies on the standard annuity formula for calculating the payment amount (M) of an amortizing loan. The formula is as follows:
M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1]
Where:
- M = Monthly Payment
- P = Principal Loan Amount (RV Price – Down Payment)
- i = Monthly Interest Rate (Annual Interest Rate / 12)
- n = Total Number of Payments (Loan Term in Years * 12)
Let’s break down the components:
- Principal Loan Amount (P): This is the actual amount you are borrowing after subtracting your down payment from the total price of the RV.
- Monthly Interest Rate (i): Lenders quote annual interest rates, but payments are usually made monthly. Therefore, you must divide the annual rate by 12 to get the rate applied each month. For example, a 6% annual rate becomes 0.06 / 12 = 0.005 monthly.
- Total Number of Payments (n): This is the loan term in years multiplied by 12, as payments are monthly. A 15-year loan would have 15 * 12 = 180 payments.
The formula calculates the fixed monthly payment that will pay off the loan, including both principal and interest, over the specified term. The power of (1 + i)^n accounts for the compounding nature of interest over the loan’s life.
Variables and Typical Ranges
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| RV Loan Amount (P) | The total amount borrowed for the RV purchase. | USD ($) | $10,000 – $250,000+ |
| Annual Interest Rate | The yearly cost of borrowing money, expressed as a percentage. | Percent (%) | 3% – 15%+ (Varies greatly by creditworthiness and market conditions) |
| Loan Term | The duration of the loan over which payments are made. | Years | 3 – 15 years (Sometimes up to 20 for high-value RVs) |
| Down Payment | The upfront amount paid by the borrower, reducing the principal. | USD ($) | $0 – 20%+ of RV price |
| Monthly Payment (M) | The fixed amount paid each month to repay the loan. | USD ($) | Calculated value |
| Total Interest Paid | The cumulative interest paid over the entire loan term. | USD ($) | Calculated value |
| Total Cost of RV | The sum of the principal loan amount and all interest paid. | USD ($) | Calculated value |
Practical Examples (Real-World Use Cases)
Example 1: New Class A Motorhome Purchase
Sarah is looking to buy a new Class A motorhome priced at $150,000. She has saved a $30,000 down payment and secured a loan offer with an annual interest rate of 7.5% for 15 years.
- RV Price: $150,000
- Down Payment: $30,000
- Loan Amount (P): $150,000 – $30,000 = $120,000
- Annual Interest Rate: 7.5%
- Loan Term: 15 Years
Using the RV loan payment calculator:
- Estimated Monthly Payment: ~$1,045.70
- Total Interest Paid: ~$67,226.00
- Total Cost of RV: ~$187,226.00
Interpretation: Sarah’s monthly payments would be around $1,045.70. Over the 15 years, she’ll pay approximately $67,226 in interest, making the total cost of the RV significantly higher than the initial loan amount. This highlights the importance of considering the long-term interest cost when financing large purchases.
Example 2: Used Travel Trailer Financing
Mark is buying a used travel trailer for $45,000. He has $5,000 for a down payment and is considering a 10-year loan at 9% annual interest.
- RV Price: $45,000
- Down Payment: $5,000
- Loan Amount (P): $45,000 – $5,000 = $40,000
- Annual Interest Rate: 9%
- Loan Term: 10 Years
Using the RV loan payment calculator:
- Estimated Monthly Payment: ~$505.87
- Total Interest Paid: ~$10,584.40
- Total Cost of RV: ~$50,584.40
Interpretation: Mark’s monthly payments would be about $505.87. Compared to Sarah’s loan, the lower principal and shorter term (relative to the value) result in a much lower total interest paid ($10,584.40). This example shows how down payments and loan terms significantly influence the overall cost of an RV loan.
How to Use This RV Loan Payment Calculator
- Enter RV Loan Amount: Input the total price of the RV you intend to purchase.
- Specify Down Payment: Enter the amount you plan to pay upfront. The calculator will automatically subtract this from the RV price to determine the actual loan amount.
- Input Annual Interest Rate: Enter the annual interest rate (APR) you’ve been offered or expect to receive for the loan.
- Select Loan Term: Choose the desired duration for your loan in years from the dropdown menu. Longer terms mean lower monthly payments but higher total interest paid.
- Calculate Payments: Click the “Calculate Payments” button.
How to Read Results:
- Estimated Monthly Payment: This is the primary figure – the amount you’ll likely pay each month.
- Total Interest Paid: Shows the total interest accumulated over the life of the loan. A key metric for understanding the true cost.
- Total Cost of RV: The sum of the loan amount and all interest, representing your total outlay.
- Amortization Period: Confirms the loan term used for the calculation.
Decision-Making Guidance: Use the calculator to compare different scenarios. Try varying the down payment, interest rate, or loan term to see how they affect your monthly budget. If the initial monthly payment seems too high, explore options like a larger down payment, a longer loan term (understanding the trade-off in total interest), or negotiating for a lower interest rate. This tool empowers you to find a loan structure that fits your financial situation comfortably.
Key Factors That Affect RV Loan Payment Results
- Loan Principal Amount: The larger the amount borrowed (RV price minus down payment), the higher your monthly payments and total interest will be. Increasing your down payment is a direct way to reduce both.
- Annual Interest Rate (APR): This is the cost of borrowing. Even small differences in interest rates can have a substantial impact on monthly payments and total interest paid over a long loan term, especially for high-value RVs. Negotiating a lower APR is crucial.
- Loan Term (Years): A longer loan term reduces your monthly payment but significantly increases the total interest paid over the life of the loan. A shorter term increases monthly payments but saves money on interest in the long run.
- Credit Score: Your credit score heavily influences the interest rate you’ll be offered. A higher credit score typically leads to a lower APR, resulting in lower monthly payments and less total interest paid.
- RV Type and Age: Lenders may offer different rates and terms based on whether the RV is new or used, and its class (Class A, B, C, travel trailer, etc.). Older or used RVs might command higher interest rates due to perceived higher risk.
- Loan Fees and Insurance: While not always directly in the payment formula, origination fees, closing costs, and mandatory comprehensive/collision insurance (often required by lenders for RV loans) add to the overall cost of RV ownership and should be factored into your budget.
- Market Conditions: Broader economic factors, such as inflation, federal reserve interest rate changes, and lender liquidity, can influence the average interest rates available for RV loans at any given time.
Frequently Asked Questions (FAQ)
- What is the typical interest rate for an RV loan?
- Interest rates for RV loans can vary widely, typically ranging from 3% to 15% or even higher. Factors like your credit score, the RV’s age and value, the loan term, and market conditions all play a significant role. New RVs and buyers with excellent credit usually secure the lowest rates.
- Can I finance the entire cost of an RV?
- While some lenders might finance up to 100% of the RV’s value, many require a down payment, often ranging from 10% to 20%. A larger down payment reduces the loan amount, leading to lower monthly payments and less interest paid overall. It also strengthens your loan application.
- How long are typical RV loan terms?
- Common loan terms for RVs range from 5 to 15 years. For more expensive, higher-class RVs, terms can extend to 20 years. Shorter terms mean higher monthly payments but less total interest paid, while longer terms offer lower monthly payments but accrue more interest over time.
- What’s the difference between a loan payment and the total cost of the RV?
- The loan payment is the fixed amount you pay each month to cover principal and interest. The total cost of the RV includes the original loan amount plus all the interest paid over the entire loan term. The total cost is always higher than the loan amount due to interest.
- Does the calculator account for taxes and fees?
- This specific calculator primarily focuses on the principal, interest rate, and term to calculate the loan payment. It does not automatically include sales tax, registration fees, or potential dealer fees, which vary by location and dealer. These should be considered separately when budgeting for your RV purchase.
- Will my monthly payment change over time?
- For most standard RV loans, the monthly payment is fixed throughout the loan term. This is known as an amortizing loan. However, if you have an adjustable-rate loan (less common for RVs), the payment could change based on market interest rate fluctuations.
- How does a higher credit score impact my RV loan payment?
- A higher credit score generally qualifies you for a lower annual interest rate (APR). A lower interest rate directly reduces your monthly payment and the total amount of interest you’ll pay over the life of the loan. It can make a significant difference in affordability.
- Can I pay off my RV loan early without penalty?
- Many RV loans are “simple interest” loans and allow for early payoff without penalty. However, it’s crucial to check your loan agreement or ask your lender about any prepayment penalties. Paying extra towards the principal can significantly reduce the total interest paid and shorten the loan term.
Related Tools and Internal Resources
- RV Depreciation Calculator: Understand how your RV’s value might decrease over time.
- RV Insurance Cost Estimator: Estimate the annual cost of insuring your recreational vehicle.
- Camper vs. Motorhome Cost Comparison: Compare the ownership costs between different types of RVs.
- RV Fuel Cost Calculator: Estimate your travel expenses based on RV mileage and fuel prices.
- Loan Affordability Calculator: A general tool to assess how much you can afford to borrow.
- RV Maintenance Cost Guide: Learn about the typical costs associated with maintaining an RV.
// Function to format currency
function formatCurrency(amount) {
return “$” + amount.toFixed(2).replace(/\d(?=(\d{3})+\.)/g, ‘$&,’);
}
// Function to clear error messages
function clearErrors() {
document.getElementById(‘loanAmountError’).innerText = ”;
document.getElementById(‘interestRateError’).innerText = ”;
document.getElementById(‘loanTermError’).innerText = ”;
document.getElementById(‘downPaymentError’).innerText = ”;
}
// Function to validate input fields
function validateInputs() {
var loanAmountInput = document.getElementById(‘loanAmount’);
var interestRateInput = document.getElementById(‘interestRate’);
var loanTermInput = document.getElementById(‘loanTerm’);
var downPaymentInput = document.getElementById(‘downPayment’);
var loanAmount = parseFloat(loanAmountInput.value);
var interestRate = parseFloat(interestRateInput.value);
var loanTerm = parseInt(loanTermInput.value);
var downPayment = parseFloat(downPaymentInput.value);
var isValid = true;
if (isNaN(loanAmount) || loanAmount <= 0) {
document.getElementById('loanAmountError').innerText = 'Please enter a valid RV loan amount.';
isValid = false;
} else {
document.getElementById('loanAmountError').innerText = '';
}
if (isNaN(interestRate) || interestRate < 0) {
document.getElementById('interestRateError').innerText = 'Please enter a valid annual interest rate.';
isValid = false;
} else {
document.getElementById('interestRateError').innerText = '';
}
// Loan term is a select, so it should always have a value if options are present.
// We can add a check if it's somehow empty or invalid if needed.
if (isNaN(loanTerm) || loanTerm <= 0) {
document.getElementById('loanTermError').innerText = 'Please select a valid loan term.';
isValid = false;
} else {
document.getElementById('loanTermError').innerText = '';
}
if (isNaN(downPayment) || downPayment < 0) {
document.getElementById('downPaymentError').innerText = 'Please enter a valid down payment amount.';
isValid = false;
} else {
document.getElementById('downPaymentError').innerText = '';
}
// Additional validation: down payment cannot exceed loan amount
var calculatedLoanAmount = loanAmount – downPayment;
if (calculatedLoanAmount < 0) {
document.getElementById('downPaymentError').innerText = 'Down payment cannot exceed the RV loan amount.';
isValid = false;
}
return isValid;
}
// Function to calculate RV loan payment
function calculateRVPFMT() {
if (!validateInputs()) {
return;
}
var loanAmountInput = document.getElementById('loanAmount');
var interestRateInput = document.getElementById('interestRate');
var loanTermInput = document.getElementById('loanTerm');
var downPaymentInput = document.getElementById('downPayment');
var principal = parseFloat(loanAmountInput.value) – parseFloat(downPaymentInput.value);
var annualRate = parseFloat(interestRateInput.value);
var years = parseInt(loanTermInput.value);
if (principal <= 0) {
document.getElementById('monthlyPayment').innerText = '$0.00';
document.getElementById('totalInterest').innerText = '$0.00';
document.getElementById('totalCost').innerText = formatCurrency(parseFloat(loanAmountInput.value));
document.getElementById('amortizationPeriod').innerText = 'N/A';
clearChart();
return;
}
var monthlyRate = annualRate / 100 / 12;
var numberOfPayments = years * 12;
var monthlyPayment = 0;
var totalInterest = 0;
var totalCost = 0;
if (monthlyRate === 0) { // Handle 0% interest rate
monthlyPayment = principal / numberOfPayments;
} else {
monthlyPayment = principal * (monthlyRate * Math.pow(1 + monthlyRate, numberOfPayments)) / (Math.pow(1 + monthlyRate, numberOfPayments) – 1);
}
totalInterest = (monthlyPayment * numberOfPayments) – principal;
totalCost = principal + totalInterest;
document.getElementById('monthlyPayment').innerText = formatCurrency(monthlyPayment);
document.getElementById('totalInterest').innerText = formatCurrency(totalInterest);
document.getElementById('totalCost').innerText = formatCurrency(totalCost);
document.getElementById('amortizationPeriod').innerText = years + ' years (' + numberOfPayments + ' months)';
updateAmortizationChart(principal, monthlyRate, numberOfPayments, monthlyPayment);
}
// Function to reset the form
function resetForm() {
document.getElementById('loanAmount').value = '75000';
document.getElementById('interestRate').value = '6.5';
document.getElementById('loanTerm').value = '15';
document.getElementById('downPayment').value = '0';
clearErrors();
calculateRVPFMT(); // Recalculate with default values
}
// Function to copy results
function copyResults() {
var monthlyPayment = document.getElementById('monthlyPayment').innerText;
var totalInterest = document.getElementById('totalInterest').innerText;
var totalCost = document.getElementById('totalCost').innerText;
var loanAmount = document.getElementById('loanAmount').value;
var interestRate = document.getElementById('interestRate').value;
var loanTerm = document.getElementById('loanTerm').value;
var downPayment = document.getElementById('downPayment').value;
var assumptions = `RV Loan Payment Calculator Assumptions:
– RV Loan Amount: ${formatCurrency(parseFloat(loanAmount)) || 'N/A'}
– Down Payment: ${formatCurrency(parseFloat(downPayment)) || 'N/A'}
– Annual Interest Rate: ${interestRate}%
– Loan Term: ${loanTerm} years`;
var resultsText = `Estimated RV Loan Payments:
Main Result: ${monthlyPayment}
Total Interest Paid: ${totalInterest}
Total Cost of RV: ${totalCost}
${assumptions}`;
// Use a temporary textarea to copy to clipboard
var tempTextArea = document.createElement("textarea");
tempTextArea.value = resultsText;
document.body.appendChild(tempTextArea);
tempTextArea.select();
document.execCommand("copy");
document.body.removeChild(tempTextArea);
// Provide user feedback (optional)
var copyButton = document.querySelector('.btn-success');
var originalText = copyButton.innerText;
copyButton.innerText = 'Copied!';
setTimeout(function() {
copyButton.innerText = originalText;
}, 2000);
}
// Charting Logic (Pure Canvas API)
var amortizationChartInstance = null; // Store chart instance
function clearChart() {
var canvas = document.getElementById('amortizationChart');
var ctx = canvas.getContext('2d');
ctx.clearRect(0, 0, canvas.width, canvas.height);
if (amortizationChartInstance) {
amortizationChartInstance.destroy(); // Destroy previous chart instance if Chart.js was used (though we are not using it here)
amortizationChartInstance = null;
}
}
function updateAmortizationChart(principal, monthlyRate, numberOfPayments, monthlyPayment) {
var canvas = document.getElementById('amortizationChart');
var ctx = canvas.getContext('2d');
ctx.clearRect(0, 0, canvas.width, canvas.height); // Clear previous drawing
// Destroy previous chart if it exists to prevent memory leaks and redraw issues
if (window.myAmortizationChart) {
window.myAmortizationChart.destroy();
}
var labels = [];
var principalPaid = [];
var interestPaid = [];
var remainingBalance = [];
var currentBalance = principal;
var totalInterestAccrued = 0;
for (var i = 0; i < numberOfPayments; i++) {
var monthInterest = currentBalance * monthlyRate;
var monthPrincipal = monthlyPayment – monthInterest;
// Adjust last payment if it causes overpayment due to rounding
if (i === numberOfPayments – 1) {
monthPrincipal = currentBalance;
monthInterest = monthlyPayment – monthPrincipal;
if (monthInterest < 0) monthInterest = 0; // Ensure interest isn't negative
}
// Ensure we don't go below zero balance
if (currentBalance – monthPrincipal < 0) {
monthPrincipal = currentBalance;
monthInterest = monthlyPayment – monthPrincipal;
if (monthInterest < 0) monthInterest = 0;
}
currentBalance -= monthPrincipal;
totalInterestAccrued += monthInterest;
labels.push('Month ' + (i + 1));
principalPaid.push(principal – currentBalance); // Total principal paid up to this month
interestPaid.push(totalInterestAccrued); // Total interest paid up to this month
remainingBalance.push(currentBalance); // Remaining balance
if (currentBalance p – (principalPaid[index-1] || 0) ), // Show monthly principal
backgroundColor: ‘rgba(0, 74, 153, 0.6)’, // Primary Blue
borderColor: ‘rgba(0, 74, 153, 1)’,
borderWidth: 1,
stack: ‘payment’, // Stack payments
type: ‘line’, // Default to line for cumulative view, will override below
fill: false,
yAxisID: ‘y-axis-principal’ // Assign to a specific Y-axis
},
{
label: ‘Interest Paid This Month’,
data: interestPaid.map((i, index) => i – (interestPaid[index-1] || 0) ), // Show monthly interest
backgroundColor: ‘rgba(255, 99, 132, 0.6)’, // Red for interest
borderColor: ‘rgba(255, 99, 132, 1)’,
borderWidth: 1,
stack: ‘payment’, // Stack payments
type: ‘line’, // Default to line for cumulative view, will override below
fill: false,
yAxisID: ‘y-axis-interest’ // Assign to a specific Y-axis
},
{
label: ‘Remaining Balance’,
data: remainingBalance,
type: ‘line’, // Line chart for remaining balance
borderColor: ‘rgba(40, 167, 69, 1)’, // Success Green
backgroundColor: ‘rgba(40, 167, 69, 0.2)’,
fill: false,
tension: 0.1,
yAxisID: ‘y-axis-balance’ // Assign to a specific Y-axis
}]
},
options: {
responsive: true,
maintainAspectRatio: false, // Allows chart to fill container width
scales: {
x: {
display: labels.length <= 30, // Show labels only if not too many months
title: {
display: true,
text: 'Loan Term (Months)'
}
},
'y-axis-principal': {
type: 'linear',
position: 'left',
stacked: false, // Principal and Interest for monthly breakdown don't stack on the primary Y axis
title: {
display: true,
text: 'Amount ($)'
},
ticks: {
beginAtZero: true,
callback: function(value) {
return '$' + value.toLocaleString();
}
}
},
'y-axis-interest': {
type: 'linear',
position: 'left',
stacked: false, // Primary Y axis handles monthly breakdown amounts
title: {
display: true,
text: 'Amount ($)'
},
ticks: {
beginAtZero: true,
callback: function(value) {
return '$' + value.toLocaleString();
}
}
},
'y-axis-balance': {
type: 'linear',
position: 'right', // Balance on the right Y axis
title: {
display: true,
text: 'Remaining Balance ($)'
},
ticks: {
beginAtZero: true,
callback: function(value) {
return '$' + value.toLocaleString();
}
},
grid: {
drawOnChartArea: false, // Only draw grid lines for the left axis if desired
}
}
},
plugins: {
legend: {
position: 'top',
},
title: {
display: true,
text: 'RV Loan Amortization Breakdown'
},
tooltip: {
mode: 'index',
intersect: false,
callbacks: {
label: function(context) {
var label = context.dataset.label || '';
if (label) {
label += ': ';
}
if (context.dataset.yAxisID === 'y-axis-principal' || context.dataset.yAxisID === 'y-axis-interest') {
label += formatCurrency(context.raw);
} else { // Remaining Balance
label += formatCurrency(context.raw);
}
return label;
}
}
}
}
}
});
}
// Initial calculation on page load
document.addEventListener('DOMContentLoaded', function() {
resetForm(); // Load with default values and perform initial calculation
});