Retirement Savings Goal Calculator

ANA›Life Services Authority›National Calculator Authority›Retirement Savings Goal Calculator

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Retirement Savings Goal Calculator

Estimate your retirement savings goal and how much you need to save each month to reach it.

Current Age

Retirement Age

Life Expectancy (years)

Desired Monthly Expenses in Retirement ($)

Current Retirement Savings ($)

Expected Annual Return Before Retirement (%)

Expected Annual Return During Retirement (%)

Expected Annual Inflation Rate (%)

Expected Monthly Social Security / Pension ($)

Calculate

function retCalc() { var currentAge = parseFloat(document.getElementById('ret-current-age').value); var retirementAge = parseFloat(document.getElementById('ret-retirement-age').value); var lifeExpectancy = parseFloat(document.getElementById('ret-life-expectancy').value); var monthlyExpenses = parseFloat(document.getElementById('ret-monthly-expenses').value); var currentSavings = parseFloat(document.getElementById('ret-current-savings').value); var annualReturn = parseFloat(document.getElementById('ret-annual-return').value); var retirementReturn = parseFloat(document.getElementById('ret-retirement-return').value); var inflation = parseFloat(document.getElementById('ret-inflation').value); var socialSecurity = parseFloat(document.getElementById('ret-social-security').value);

var resultDiv = document.getElementById('ret-result');

// --- Validation --- if (isNaN(currentAge) || isNaN(retirementAge) || isNaN(lifeExpectancy) || isNaN(monthlyExpenses) || isNaN(currentSavings) || isNaN(annualReturn) || isNaN(retirementReturn) || isNaN(inflation) || isNaN(socialSecurity)) { resultDiv.innerHTML = 'Please fill in all fields.

'; return; } if (currentAge 80) { resultDiv.innerHTML = 'Current age must be between 18 and 80.

'; return; } if (retirementAge PMT = FV * r_m / [(1 + r_m)^n - 1] var realMonthlyRate = Math.pow(1 + realAccum, 1/12) - 1; var totalMonths = yearsToRetirement * 12; var monthlyContrib; if (Math.abs(realMonthlyRate) 0 ? additionalNeeded / totalMonths : additionalNeeded; } else { monthlyContrib = additionalNeeded * realMonthlyRate / (Math.pow(1 + realMonthlyRate, totalMonths) - 1); }

// Step 5: Total contributions & growth breakdown var totalContributions = monthlyContrib * totalMonths; var totalGrowth = additionalNeeded - totalContributions;

// Savings rate context (optional informational) var fmt = function(n) { return n.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2}); };

var html = '### Your Retirement Savings Plan '; html += ''; html += 'Years Until Retirement' + yearsToRetirement + ' years'; html += 'Years in Retirement' + yearsInRetirement + ' years'; html += 'Monthly Income Gap (expenses − Social Security/Pension)$' + fmt(monthlyGap) + ''; html += 'Total Nest Egg Needed at Retirement (today's $)$' + fmt(nestEgg) + ''; html += 'Future Value of Current Savings (today's $)$' + fmt(fvCurrentSavings) + ''; html += 'Additional Savings Needed$' + fmt(additionalNeeded) + ''; html += 'Required Monthly Contribution (today's $)$' + fmt(monthlyContrib) + ''; html += 'Total Contributions Over ' + yearsToRetirement + ' Years$' + fmt(totalContributions) + ''; html += 'Total Investment Growth$' + fmt(Math.max(0, totalGrowth)) + ''; html += 'Real Accumulation Rate (inflation-adjusted)' + (realAccum * 100).toFixed(2) + '%'; html += 'Real Distribution Rate (inflation-adjusted)' + (realDist * 100).toFixed(2) + '%'; html += '';

if (fvCurrentSavings >= nestEgg) { html += '✓ Great news! Your current savings alone may be sufficient to meet your retirement goal — no additional monthly contributions required.

'; }

resultDiv.innerHTML = html; }

#### Formulas Used

1. Nest Egg Needed (Present Value of Retirement Annuity — in today's dollars):

Nest Egg = Annual Gap × [1 − (1 + r_real_dist)^(−n_ret)] / r_real_dist

Where Annual Gap = (Monthly Expenses − Social Security) × 12, r_real_dist = real return during retirement, n_ret = years in retirement.

2. Future Value of Current Savings (inflation-adjusted):

FV = Current Savings × (1 + r_real_accum)^(years to retirement)

3. Real (Inflation-Adjusted) Rate — Fisher Equation:

r_real = (1 + r_nominal) / (1 + r_inflation) − 1

4. Required Monthly Contribution (Future Value of Annuity):

PMT = Additional Needed × r_m / [(1 + r_m)^(N) − 1]

Where r_m = real monthly rate = (1 + r_real_accum)^(1/12) − 1, N = total months to retirement.

All figures are expressed in today's dollars (inflation-adjusted) for easier planning.

#### Assumptions & References

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References

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