Weight Based IV Calculations – Your Expert Guide & Calculator
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Weight Based IV Calculator
Calculation Results
Projected Investment Value (End of Term)
Results copied successfully!
Investment Growth Over Time
Visualizing projected investment growth and real value considering inflation.
Investment Projections Table
| Year |
Beginning Value |
Growth |
Fees |
Net Value |
Real Value (Inflation Adjusted) |
Detailed year-by-year breakdown of investment performance.
What is Weight Based IV Calculations?
Weight Based IV Calculations refer to a method of assessing the future value and performance of an individual investment asset within the context of a larger portfolio. It's not just about how much an investment might grow in isolation, but also about how its growth (or loss) impacts the overall financial picture, considering its proportional size within the total investment strategy. This approach is crucial for investors who want a nuanced understanding of their portfolio's trajectory, acknowledging that each component plays a specific role and contributes differently to the final outcome.
Who should use it? This type of calculation is invaluable for:
- Portfolio Managers: To understand the impact of individual asset performance on overall portfolio goals.
- Financial Advisors: To provide clients with a clear, contextualized view of how each part of their investment strategy is performing and is projected to perform.
- Savvy Individual Investors: Those who actively manage their portfolios and want to move beyond simple growth projections to a more sophisticated analysis.
- Anyone rebalancing their portfolio: Understanding the current and projected value of assets relative to their target weight is key.
Common Misconceptions: A frequent misunderstanding is that an investment's "value" is solely its current market price or its isolated future projection. However, weight based IV calculations emphasize that value is also relative to the total portfolio. An asset might have high individual growth, but if it's a small portion of the portfolio, its impact on the overall net worth might be less significant than a moderately growing asset that holds a larger weight. Another misconception is underestimating the impact of fees and inflation, which can significantly erode real returns over the long term, especially for assets with substantial weight.
The Importance of Asset Weight
The "weight" of an asset in a portfolio is its market value expressed as a percentage of the total portfolio's market value. For example, if your total portfolio is worth $200,000 and you hold $50,000 in a specific stock, that stock has a 25% weight. Understanding this weight is critical because it dictates how much influence that single asset has on your portfolio's overall returns, risk, and diversification. A high-weight asset can drive significant gains but also substantial losses, while many low-weight assets collectively can have a substantial impact.
Weight Based IV Calculations Formula and Mathematical Explanation
The core of weight based IV calculations involves several steps to arrive at a comprehensive understanding of an investment's projected future value. We start with the fundamental compound interest formula and layer in factors like asset weighting, management fees, and inflation.
Step-by-Step Derivation:
- Calculate Asset's Actual Value: Determine the current market value of the specific asset being analyzed within the portfolio.
Formula: Asset Value = Base Investment Value * (Asset Weight / 100)
Or, if Portfolio Value is primary: Asset Value = Total Portfolio Value * (Asset Weight / 100)
- Calculate Net Annual Growth Rate: Adjust the projected growth rate for any annual fees. Fees reduce the effective return.
Formula: Net Growth Rate = Projected Annual Growth Rate - Annual Fees
- Calculate Future Value (Nominal): Use the compound interest formula to find the future value of the asset based on its net growth rate.
Formula: Nominal FV = Asset Value * (1 + (Net Growth Rate / 100))^Investment Horizon
- Calculate Real (Inflation-Adjusted) Growth Rate: Determine how much purchasing power is lost due to inflation.
Formula: Real Growth Rate = ((1 + (Net Growth Rate / 100)) / (1 + (Inflation Rate / 100))) - 1
Expressed as a percentage: Real Growth Rate (%) = Real Growth Rate * 100
- Calculate Future Value (Real): Adjust the nominal future value for inflation to find the real value (purchasing power) at the end of the term.
Formula: Real FV = Nominal FV / (1 + (Inflation Rate / 100))^Investment Horizon
- Calculate Total Fees Paid: Sum of all fees paid over the investment horizon. This can be approximated or calculated more precisely year-by-year. For simplicity here, we approximate based on the average value. A more precise method involves summing fees calculated on the changing balance each year.
Approximate Formula: Total Fees = Asset Value * (Annual Fees / 100) * Investment Horizon (Note: This is a simplification. Precise calculation requires annual compounding of fees on the growing balance.)
Variable Explanations:
| Variable |
Meaning |
Unit |
Typical Range |
| Base Investment Value (PV) |
The initial amount invested in the specific asset. |
Currency (e.g., USD, EUR) |
$1,000 – $1,000,000+ |
| Asset Weight (%) |
The proportion of the specific asset within the total portfolio. |
Percentage (%) |
0.1% – 100% |
| Total Portfolio Value |
The total market value of all investments combined. |
Currency (e.g., USD, EUR) |
$5,000 – $10,000,000+ |
| Projected Annual Growth Rate (%) |
The expected average annual return of the asset before fees. |
Percentage (%) |
1% – 20% (Varies widely by asset class) |
| Investment Horizon (n) |
The duration for which the investment is held. |
Years |
1 – 50+ |
| Annual Fees (%) |
Percentage of the asset's value deducted annually for management, etc. |
Percentage (%) |
0% – 5% (Depends on investment type) |
| Expected Annual Inflation Rate (%) |
The average rate at which the general level of prices for goods and services is rising. |
Percentage (%) |
1% – 10% (Historically averages around 2-3%) |
| Net Growth Rate |
The growth rate after deducting fees. |
Decimal (e.g., 0.05 for 5%) |
-10% to +15% |
| Real Growth Rate |
The growth rate adjusted for inflation, indicating change in purchasing power. |
Decimal (e.g., 0.02 for 2%) |
-10% to +10% |
| Projected Investment Value (End of Term) |
The nominal value of the investment at the end of the horizon. |
Currency |
Varies |
| Real Value (Inflation Adjusted) |
The purchasing power equivalent of the future value in today's terms. |
Currency |
Varies |
Mastering these weight based IV calculations allows for more informed financial planning and realistic expectation setting.
Practical Examples (Real-World Use Cases)
Let's illustrate weight based IV calculations with practical scenarios:
Example 1: Balanced Growth Portfolio Component
Sarah has a diversified portfolio. She's analyzing her investment in a specific mutual fund:
- Base Investment Value: $50,000
- Asset Weight: 20%
- Total Portfolio Value: $250,000
- Projected Annual Growth Rate: 8%
- Investment Horizon: 15 years
- Annual Fees: 1.5%
- Expected Annual Inflation: 2.5%
Calculator Inputs:
- Base Investment Value: 50000
- Asset Weight: 20
- Total Portfolio Value: 250000
- Projected Annual Growth Rate: 8
- Investment Horizon: 15
- Annual Fees: 1.5
- Expected Annual Inflation: 2.5
Expected Calculator Output (Illustrative):
- Primary Result (Projected Investment Value): ~$175,000
- Intermediate Value (Asset's Actual Value): $50,000
- Intermediate Value (Net Annual Growth Rate): 6.5%
- Intermediate Value (Real Growth Rate): ~4.0%
- Intermediate Value (Total Fees Paid): ~$10,000 (approx.)
Financial Interpretation: Sarah's $50,000 investment, despite an 8% nominal growth projection, is expected to grow to approximately $175,000 in 15 years after accounting for 1.5% annual fees. Critically, its *real* value, adjusted for 2.5% annual inflation, will be significantly less in terms of purchasing power. Understanding this difference is key for setting realistic retirement or financial goals. The 20% weight indicates this mutual fund is a significant driver of her portfolio's performance.
Example 2: High-Growth Tech Stock Component
John is evaluating a speculative tech stock in his portfolio:
- Base Investment Value: $10,000
- Asset Weight: 5%
- Total Portfolio Value: $200,000
- Projected Annual Growth Rate: 15%
- Investment Horizon: 5 years
- Annual Fees: 0.5% (e.g., brokerage fees)
- Expected Annual Inflation: 3%
Calculator Inputs:
- Base Investment Value: 10000
- Asset Weight: 5
- Total Portfolio Value: 200000
- Projected Annual Growth Rate: 15
- Investment Horizon: 5
- Annual Fees: 0.5
- Expected Annual Inflation: 3
Expected Calculator Output (Illustrative):
- Primary Result (Projected Investment Value): ~$20,100
- Intermediate Value (Asset's Actual Value): $10,000
- Intermediate Value (Net Annual Growth Rate): 14.5%
- Intermediate Value (Real Growth Rate): ~11.2%
- Intermediate Value (Total Fees Paid): ~$250 (approx.)
Financial Interpretation: John's tech stock, with its aggressive 15% projected growth, is expected to more than double its nominal value in 5 years, reaching over $20,000. The net growth rate remains high at 14.5% due to low fees. However, the weight based IV calculations also reveal its real growth rate is around 11.2%. While this indicates substantial wealth creation potential, the 5% asset weight means its overall impact on his $200,000 portfolio is moderate. This analysis helps John decide if the risk/reward profile of this high-weight asset aligns with his strategy.
How to Use This Weight Based IV Calculator
Using our Weight Based IV Calculator is straightforward and designed to provide actionable insights into your investment's future. Follow these steps:
Step-by-Step Instructions:
- Input Base Investment Value: Enter the current market value of the specific asset you want to analyze.
- Enter Asset Weight (%): Input the percentage this asset represents in your total investment portfolio. If you don't have this readily available, you can calculate it using the 'Base Investment Value' and 'Total Portfolio Value' fields.
- Provide Total Portfolio Value: Enter the total current market value of all your investments combined. This helps contextualize the asset's weight.
- Specify Projected Annual Growth Rate (%): Estimate the average annual return you expect this asset to generate over the investment horizon. Research is key here – use historical data, market forecasts, or your advisor's recommendations.
- Set Investment Horizon (Years): Enter the number of years you plan to hold this investment.
- Input Annual Fees (%): Enter any recurring annual fees associated with this asset (e.g., fund management fees, advisory fees).
- Enter Expected Annual Inflation (%): Provide an estimate for the average annual inflation rate over your investment horizon.
- Click 'Calculate IV': Once all fields are populated, click the button. The calculator will instantly update with your projected outcomes.
How to Read Results:
- Projected Investment Value (Primary Result): This is the nominal future value of your investment at the end of the specified horizon, assuming the growth rate and fees remain constant.
- Asset's Actual Value in Portfolio: Confirms the current monetary value of the asset based on its weight and total portfolio value.
- Net Annual Growth Rate: Shows the effective annual growth after deducting fees. A higher number is better.
- Real Growth Rate: This crucial metric indicates the growth in your purchasing power after accounting for inflation. A positive real growth rate means your investment is outpacing inflation.
- Total Fees Paid Over Term: An estimation of the total cost incurred due to fees throughout the investment period.
- Projection Table: Provides a year-by-year breakdown, showing how the investment grows and how fees and inflation affect its value over time.
- Chart: Visually represents the nominal growth versus the real (inflation-adjusted) growth, making the impact of inflation starkly clear.
Decision-Making Guidance:
Use these results to:
- Compare Investments: Evaluate different assets based on their projected real returns and their contribution to your portfolio.
- Assess Risk vs. Reward: Understand if the projected growth justifies the fees and the inherent risks associated with an asset, especially for those with a significant weight.
- Adjust Strategy: If the real growth rate is too low, consider if fees are too high, growth expectations are unrealistic, or if the asset allocation needs rebalancing.
- Validate Assumptions: The calculator helps you see the long-term impact of your assumptions about growth, fees, and inflation. Adjust inputs to perform sensitivity analysis.
This tool empowers you to make more informed decisions by performing thorough weight based IV calculations.
Key Factors That Affect Weight Based IV Results
Several critical factors influence the outcome of weight based IV calculations. Understanding these elements is essential for accurate projections and sound financial decision-making:
- Asset Weight and Allocation: This is fundamental. An asset with a higher weight will have a proportionally larger impact (positive or negative) on the total portfolio's performance. Aggressively weighted assets amplify both gains and losses. Proper asset allocation is key to balancing risk and return.
- Projected Growth Rate Accuracy: Overestimating growth leads to unrealistic expectations, while underestimating might cause you to miss opportunities. This rate is influenced by market conditions, asset class performance, economic outlook, and specific company/fund fundamentals.
- Impact of Fees: Management fees, expense ratios, transaction costs, and advisory fees all directly reduce your investment returns. Even seemingly small annual fees (like 1-2%) can compound significantly over long investment horizons, especially for high-weight assets, substantially lowering the net and real growth.
- Inflation's Erosion of Purchasing Power: Inflation reduces the real value of your returns. A high nominal return might seem impressive, but if inflation is higher, your investment isn't actually growing in terms of what it can buy. Real returns (adjusted for inflation) are the true measure of wealth creation.
- Investment Horizon (Time): The longer the investment horizon, the more pronounced the effects of compounding, fees, and inflation become. Short-term fluctuations smooth out over time, but the cumulative impact of costs and inflation is substantial over decades. A longer horizon generally allows for potentially higher-growth (and higher-risk) assets.
- Risk and Volatility: While not directly in the core formula, the volatility of an asset impacts the reliability of the projected growth rate. High-volatility assets may achieve high average returns but come with a greater chance of significant drawdowns, potentially impacting the final value and requiring adjustments to portfolio risk management.
- Tax Implications: Taxes on capital gains, dividends, or interest income can significantly reduce the net returns received by the investor. Depending on the account type (taxable vs. tax-advantaged) and jurisdiction, taxes can act similarly to fees in reducing overall profitability.
- Cash Flow and Reinvestment: The calculator assumes the initial value is invested and grows. However, if the investment generates regular income (dividends, interest) that is withdrawn rather than reinvested, the compounding effect is diminished. The timing and strategy for reinvesting returns critically affect final value.
Careful consideration of these factors ensures that your weight based IV calculations provide the most accurate and useful financial insights.
Frequently Asked Questions (FAQ)
What is the difference between nominal and real investment value?
Nominal value is the stated future value of an investment without accounting for inflation. Real value is the nominal value adjusted for inflation, representing its actual purchasing power in today's terms. For example, $100 in 30 years will likely buy less than $100 today due to inflation.
How accurate are projected growth rates?
Projected growth rates are estimations based on historical data, market analysis, and economic forecasts. They are not guarantees. Actual returns can vary significantly due to market volatility, economic events, and unforeseen circumstances. It's wise to use a range of growth rate assumptions in your analysis.
Should I prioritize low fees or high growth?
This is a critical trade-off in investing. High fees can significantly erode returns over time, especially for assets with large weights. However, very low-fee investments might offer lower growth potential. The ideal is to find investments with a reasonable balance – good growth prospects with competitive, transparent fees. Our calculator helps quantify this impact.
Does the calculator account for taxes?
This specific calculator does not directly account for taxes on capital gains or income. Taxes are a significant factor that can reduce net returns. You would need to estimate your tax liability and potentially adjust the 'Projected Annual Growth Rate' downwards or perform a separate tax calculation.
How do I calculate 'Asset Weight' if I know my Base Investment Value and Total Portfolio Value?
To calculate Asset Weight (in percentage), use the formula: (Base Investment Value / Total Portfolio Value) * 100. For instance, if your asset is worth $50,000 and your total portfolio is $250,000, the weight is ($50,000 / $250,000) * 100 = 20%.
What is a 'good' real growth rate?
A 'good' real growth rate is relative to your financial goals and risk tolerance. Historically, a real annual return of 4-7% has been considered strong for diversified portfolios. Significantly exceeding inflation consistently is generally desirable for wealth building.
Can I use this for non-stock investments like real estate or bonds?
Yes, the principles apply. However, the 'Projected Annual Growth Rate' and 'Annual Fees' will differ significantly. Real estate might have rental income, appreciation, and different costs (property taxes, maintenance), while bonds have coupon payments and interest rate sensitivity. Ensure your inputs accurately reflect the specific asset class.
How often should I re-run these calculations?
It's advisable to re-run these calculations at least annually, or whenever there are significant changes in market conditions, your portfolio allocation, or your financial goals. This helps you stay informed about your investment's progress and make necessary adjustments.
What does "Net Annual Growth Rate" represent?
The Net Annual Growth Rate is the growth rate of your investment after deducting any annual fees. For example, if an investment is projected to grow by 8% annually but has 1.5% in fees, its net annual growth rate is 6.5%. This is the rate that actually compounds in your account.
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function getNumericValue(id, defaultValue = 0) {
var input = document.getElementById(id);
var value = parseFloat(input.value);
return isNaN(value) ? defaultValue : value;
}
function formatCurrency(amount) {
return amount.toLocaleString(undefined, { style: 'currency', currency: 'USD' });
}
function formatPercentage(value) {
return value.toFixed(2) + '%';
}
function formatYears(value) {
return parseInt(value, 10) + ' years';
}
function formatDecimal(value) {
return value.toFixed(4);
}
function calculateIV() {
var isValid = true;
// Validate all inputs
isValid &= validateInput('baseValue', 0);
isValid &= validateInput('assetWeight', 0, 100);
isValid &= validateInput('portfolioValue', 0);
isValid &= validateInput('growthRate', -100); // Allow negative growth
isValid &= validateInput('investmentHorizon', 0);
isValid &= validateInput('feesPercentage', 0, 100);
isValid &= validateInput('inflationRate', -20); // Allow negative inflation
if (!isValid) {
document.getElementById('resultsSection').style.display = 'none';
return;
}
var baseValue = getNumericValue('baseValue');
var assetWeightPercent = getNumericValue('assetWeight');
var portfolioValue = getNumericValue('portfolioValue');
var growthRatePercent = getNumericValue('growthRate');
var investmentHorizon = getNumericValue('investmentHorizon');
var feesPercentage = getNumericValue('feesPercentage');
var inflationRatePercent = getNumericValue('inflationRate');
// — Calculations —
var assetWeight = assetWeightPercent / 100;
var portfolioAssetValue = portfolioValue * assetWeight;
// Ensure base value matches portfolio context if needed, or use the provided base value
// For this calculator, we'll use the provided Base Investment Value as the starting point
// If portfolioAssetValue is significantly different, it might indicate an input mismatch, but we'll proceed with Base Value for core growth.
// However, we'll show the calculated portfolioAssetValue as an intermediate result.
var currentValue = baseValue; // Use the explicitly entered base value for growth calculation
var netGrowthRatePercent = growthRatePercent – feesPercentage;
var netGrowthRateDecimal = netGrowthRatePercent / 100;
var nominalFV = currentValue * Math.pow(1 + netGrowthRateDecimal, investmentHorizon);
var inflationRateDecimal = inflationRatePercent / 100;
// Ensure inflation rate isn't exactly -100% to avoid division by zero or invalid calculations
if (1 + inflationRateDecimal <= 0) {
// Handle cases where inflation is extreme (e.g., hyperinflation or deflation to zero/negative)
// For simplicity, we'll set real growth to 0 or a very low number if denominator is invalid
var realFV = 0;
var realGrowthRateDecimal = -1; // Indicate significant loss of value
} else {
var realFV = nominalFV / Math.pow(1 + inflationRateDecimal, investmentHorizon);
// Real Growth Rate Calculation: (1 + net_rate) / (1 + inflation_rate) – 1
var realGrowthRateDecimal = ((1 + netGrowthRateDecimal) / (1 + inflationRateDecimal)) – 1;
}
// Approximate Total Fees Calculation (simplified for display)
// A more accurate calculation would sum fees year by year on the growing balance.
var averageBalance = (currentValue + nominalFV) / 2; // Rough average balance
var totalFeesApprox = averageBalance * (feesPercentage / 100) * investmentHorizon;
// — Update Results Display —
document.getElementById('primaryResult').textContent = formatCurrency(realFV);
document.getElementById('portfolioAssetValue').textContent = formatCurrency(portfolioAssetValue);
document.getElementById('netGrowthRate').textContent = formatPercentage(netGrowthRatePercent);
document.getElementById('realGrowthRate').textContent = formatPercentage(realGrowthRateDecimal * 100);
document.getElementById('totalFees').textContent = formatCurrency(totalFeesApprox); // Displaying approximation
document.getElementById('resultsSection').style.display = 'block';
// — Update Chart —
updateChart(currentValue, nominalFV, realFV, investmentHorizon, netGrowthRateDecimal, inflationRateDecimal);
// — Update Table —
updateTable(currentValue, nominalFV, realFV, investmentHorizon, netGrowthRateDecimal, inflationRateDecimal, feesPercentage, inflationRatePercent);
}
function updateChart(startValue, nominalEndValue, realEndValue, years, netRate, inflationRate) {
var ctx = document.getElementById('ivChart').getContext('2d');
// Destroy previous chart instance if it exists
if (window.myIVChart) {
window.myIVChart.destroy();
}
var yearsArray = [];
var nominalValues = [];
var realValues = [];
var inflationAdjustedValues = []; // Track inflation's effect on original value
var currentNominal = startValue;
var currentReal = startValue;
var currentInflationMultiplier = 1.0;
for (var i = 0; i 0) { // For year 0, real and nominal are the same as startValue
currentNominal = startValue * Math.pow(1 + netRate, i);
currentReal = currentNominal / Math.pow(1 + inflationRate, i);
} else {
currentReal = startValue;
}
realValues.push(currentReal);
// Update for next iteration if not the last year
if (i < years) {
currentNominal = startValue * Math.pow(1 + netRate, i + 1); // Recalculate based on start for clarity
// currentNominal = nominalValues[nominalValues.length – 1] * (1 + netRate); // Alternative: compound from previous year
}
}
// Ensure end values match the primary calculation if they differ slightly due to floating point precision
nominalValues[nominalValues.length – 1] = startValue * Math.pow(1 + netRate, years);
realValues[realValues.length – 1] = nominalValues[nominalValues.length – 1] / Math.pow(1 + inflationRate, years);
window.myIVChart = new Chart(ctx, {
type: 'line',
data: {
labels: yearsArray,
datasets: [{
label: 'Nominal Value',
data: nominalValues,
borderColor: 'rgba(0, 74, 153, 1)', // Primary color
backgroundColor: 'rgba(0, 74, 153, 0.2)',
fill: true,
tension: 0.1
}, {
label: 'Real Value (Inflation Adjusted)',
data: realValues,
borderColor: 'rgba(40, 167, 69, 1)', // Success color
backgroundColor: 'rgba(40, 167, 69, 0.2)',
fill: true,
tension: 0.1
}]
},
options: {
responsive: true,
maintainAspectRatio: false,
scales: {
y: {
beginAtZero: false,
ticks: {
callback: function(value) {
return formatCurrency(value);
}
}
},
x: {
title: {
display: true,
text: 'Investment Horizon (Years)'
}
}
},
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 updateTable(startValue, nominalEndValue, realEndValue, years, netRate, inflationRate, feesPercent, inflationPercent) {
var tableBody = document.querySelector('#projectionTable tbody');
tableBody.innerHTML = ''; // Clear existing rows
var currentNominal = startValue;
var currentReal = startValue;
var currentFees = 0;
for (var i = 0; i 0) {
growthAmount = currentNominal * netRate;
currentNominal += growthAmount;
growthCell.textContent = formatCurrency(growthAmount);
} else {
growthCell.textContent = '-';
}
var feesCell = row.insertCell();
var feeAmount = 0;
if (i > 0) {
// Calculate fees based on the balance *before* growth for this year's end calculation,
// or on the average balance. Let's use the beginning balance for simplicity here.
feeAmount = beginningValueCell.textContent !== '-' ? parseFloat(beginningValueCell.textContent.replace(/[^0-9.-]+/g,"")) * (feesPercent / 100) : 0;
currentFees += feeAmount; // Accumulate total fees
feesCell.textContent = formatCurrency(-feeAmount);
} else {
feesCell.textContent = '-';
}
var netValueCell = row.insertCell();
// Net value at the end of the year is the beginning value + growth – fees
netValueCell.textContent = formatCurrency(currentNominal); // currentNominal is already updated with growth and will reflect fees implicitly if calculated from beginning balance.
var realValueCell = row.insertCell();
var inflationMultiplier = Math.pow(1 + (inflationPercent / 100), i);
currentReal = currentNominal / inflationMultiplier;
realValueCell.textContent = formatCurrency(currentReal);
}
// Ensure the last row reflects the calculated end values precisely
var lastRow = tableBody.rows[tableBody.rows.length – 1];
var finalNominalCalc = startValue * Math.pow(1 + netRate, years);
var finalRealCalc = finalNominalCalc / Math.pow(1 + inflationRate, years);
lastRow.cells[1].textContent = formatCurrency(startValue); // Beginning Value for year 1 (or Start row)
if (years > 0) {
// Recalculate growth and fees for the last year precisely
var lastYearGrowth = finalNominalCalc – startValue * Math.pow(1 + netRate, years – 1);
lastRow.cells[2].textContent = formatCurrency(lastYearGrowth); // Growth for final year
var lastYearFees = (startValue * Math.pow(1 + netRate, years – 1)) * (feesPercent / 100); // Simplified fee calculation for last year
lastRow.cells[3].textContent = formatCurrency(-lastYearFees); // Fees for final year
lastRow.cells[4].textContent = formatCurrency(finalNominalCalc); // Net Value at end
lastRow.cells[5].textContent = formatCurrency(finalRealCalc); // Real Value at end
} else { // Handle 0 years case
lastRow.cells[2].textContent = '-';
lastRow.cells[3].textContent = '-';
lastRow.cells[4].textContent = formatCurrency(startValue);
lastRow.cells[5].textContent = formatCurrency(startValue);
}
}
function resetCalculator() {
document.getElementById('baseValue').value = '100000';
document.getElementById('assetWeight').value = '50';
document.getElementById('portfolioValue').value = '200000';
document.getElementById('growthRate').value = '7';
document.getElementById('investmentHorizon').value = '10';
document.getElementById('feesPercentage').value = '1';
document.getElementById('inflationRate').value = '3';
// Clear errors
var errorElements = document.querySelectorAll('.error-message');
for (var i = 0; i < errorElements.length; i++) {
errorElements[i].textContent = '';
}
var inputGroups = document.querySelectorAll('.input-group');
for (var i = 0; i < inputGroups.length; i++) {
inputGroups[i].classList.remove('error');
}
// Clear results and hide section
document.getElementById('primaryResult').textContent = '';
document.getElementById('portfolioAssetValue').textContent = '';
document.getElementById('netGrowthRate').textContent = '';
document.getElementById('realGrowthRate').textContent = '';
document.getElementById('totalFees').textContent = '';
document.getElementById('resultsSection').style.display = 'none';
// Clear chart and table
if (window.myIVChart) {
window.myIVChart.destroy();
window.myIVChart = null;
}
document.querySelector('#projectionTable tbody').innerHTML = '';
document.getElementById('copyMessage').style.display = 'none';
// Optional: Trigger calculation after reset if defaults are sensible
// calculateIV();
}
function copyResults() {
var primaryResult = document.getElementById('primaryResult').textContent;
var portfolioAssetValue = document.getElementById('portfolioAssetValue').textContent;
var netGrowthRate = document.getElementById('netGrowthRate').textContent;
var realGrowthRate = document.getElementById('realGrowthRate').textContent;
var totalFees = document.getElementById('totalFees').textContent;
var assumptions = "Key Assumptions:\n";
assumptions += "- Base Investment Value: " + formatCurrency(getNumericValue('baseValue')) + "\n";
assumptions += "- Asset Weight: " + getNumericValue('assetWeight') + "%\n";
assumptions += "- Total Portfolio Value: " + formatCurrency(getNumericValue('portfolioValue')) + "\n";
assumptions += "- Projected Annual Growth Rate: " + formatPercentage(getNumericValue('growthRate')) + "\n";
assumptions += "- Investment Horizon: " + formatYears(getNumericValue('investmentHorizon')) + "\n";
assumptions += "- Annual Fees: " + formatPercentage(getNumericValue('feesPercentage')) + "\n";
assumptions += "- Expected Annual Inflation: " + formatPercentage(getNumericValue('inflationRate')) + "\n";
var resultsText = "— Weight Based IV Calculation Results —\n\n";
resultsText += "Projected Investment Value (End of Term): " + primaryResult + "\n";
resultsText += "Asset's Actual Value in Portfolio: " + portfolioAssetValue + "\n";
resultsText += "Net Annual Growth Rate: " + netGrowthRate + "\n";
resultsText += "Real Growth Rate (Inflation Adjusted): " + realGrowthRate + "\n";
resultsText += "Estimated Total Fees Paid Over Term: " + totalFees + "\n\n";
resultsText += assumptions;
// Use Clipboard API
navigator.clipboard.writeText(resultsText).then(function() {
var copyMessage = document.getElementById('copyMessage');
copyMessage.textContent = 'Results copied successfully!';
copyMessage.style.display = 'block';
setTimeout(function() { copyMessage.style.display = 'none'; }, 3000);
}).catch(function(err) {
console.error('Failed to copy: ', err);
var copyMessage = document.getElementById('copyMessage');
copyMessage.textContent = 'Failed to copy results.';
copyMessage.style.color = '#dc3545';
copyMessage.style.display = 'block';
setTimeout(function() { copyMessage.style.display = 'none'; copyMessage.style.color = 'var(–success-color)'; }, 3000);
});
}
// FAQ functionality
document.addEventListener('DOMContentLoaded', function() {
var faqItems = document.querySelectorAll('.faq-item .question');
for (var i = 0; i < faqItems.length; i++) {
faqItems[i].addEventListener('click', function() {
var parent = this.parentElement;
parent.classList.toggle('open');
var answer = parent.querySelector('.answer');
if (parent.classList.contains('open')) {
answer.style.display = 'block';
} else {
answer.style.display = 'none';
}
});
}
// Initial calculation on load if defaults are set
calculateIV();
});