Retirement Savings Calculator
This calculator helps you estimate how much you might need for retirement based on your current savings, expected contributions, investment growth, and desired retirement income.
function calculateRetirementSavings() {
var currentSavings = parseFloat(document.getElementById("currentSavings").value);
var annualContributions = parseFloat(document.getElementById("annualContributions").value);
var expectedAnnualReturn = parseFloat(document.getElementById("expectedAnnualReturn").value) / 100; // Convert percentage to decimal
var yearsToRetirement = parseInt(document.getElementById("yearsToRetirement").value);
var desiredAnnualIncome = parseFloat(document.getElementById("desiredAnnualIncome").value);
var withdrawalRate = parseFloat(document.getElementById("withdrawalRate").value) / 100; // Convert percentage to decimal
var resultDiv = document.getElementById("result");
resultDiv.innerHTML = ""; // Clear previous results
// Input validation
if (isNaN(currentSavings) || isNaN(annualContributions) || isNaN(expectedAnnualReturn) || isNaN(yearsToRetirement) || isNaN(desiredAnnualIncome) || isNaN(withdrawalRate) ||
currentSavings < 0 || annualContributions < 0 || expectedAnnualReturn < 0 || yearsToRetirement <= 0 || desiredAnnualIncome < 0 || withdrawalRate <= 0) {
resultDiv.innerHTML = "Please enter valid positive numbers for all fields. Years to retirement must be greater than 0.";
return;
}
// Calculate future value of current savings
var futureValueOfCurrentSavings = currentSavings * Math.pow((1 + expectedAnnualReturn), yearsToRetirement);
// Calculate future value of annual contributions (using future value of an ordinary annuity formula)
var futureValueOfContributions = annualContributions * (((Math.pow((1 + expectedAnnualReturn), yearsToRetirement) – 1) / expectedAnnualReturn) * (1 + expectedAnnualReturn));
// If return is 0, it's simpler: annualContributions * yearsToRetirement
// Total projected savings at retirement
var totalProjectedSavings = futureValueOfCurrentSavings + futureValueOfContributions;
// Calculate required nest egg based on desired income and withdrawal rate
var requiredNestEgg = desiredAnnualIncome / withdrawalRate;
var outputHtml = "
Retirement Projection
";
outputHtml += "
Projected Total Savings at Retirement: $" + totalProjectedSavings.toFixed(2) + "";
outputHtml += "
Required Nest Egg for Desired Income: $" + requiredNestEgg.toFixed(2) + "";
if (totalProjectedSavings >= requiredNestEgg) {
outputHtml += "Congratulations! Based on these estimates, you are projected to have enough savings to support your desired retirement income.";
} else {
var shortfall = requiredNestEgg – totalProjectedSavings;
outputHtml += "Based on these estimates, you may have a shortfall of $" + shortfall.toFixed(2) + " for your desired retirement income. Consider increasing contributions, adjusting your expected return, or modifying your retirement spending goals.";
}
resultDiv.innerHTML = outputHtml;
}
.calculator-container {
font-family: sans-serif;
max-width: 600px;
margin: 20px auto;
padding: 20px;
border: 1px solid #ddd;
border-radius: 8px;
background-color: #f9f9f9;
}
.calculator-container h2 {
text-align: center;
color: #333;
margin-bottom: 20px;
}
.calculator-form .form-group {
margin-bottom: 15px;
display: flex;
flex-direction: column;
}
.calculator-form label {
margin-bottom: 5px;
font-weight: bold;
color: #555;
}
.calculator-form input[type="number"] {
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 1em;
width: 100%;
box-sizing: border-box; /* Include padding and border in the element's total width and height */
}
.calculator-form button {
background-color: #4CAF50;
color: white;
padding: 12px 20px;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 1.1em;
width: 100%;
margin-top: 10px;
}
.calculator-form button:hover {
background-color: #45a049;
}
.calculator-result {
margin-top: 25px;
padding: 15px;
border: 1px solid #eee;
border-radius: 4px;
background-color: #fff;
}
.calculator-result h3 {
color: #333;
margin-top: 0;
margin-bottom: 15px;
}