Retirement Planning (Couples) Calculator
Project your combined retirement savings from two incomes. See your total nest egg, sustainable withdrawal income, and whether you're on track for your desired retirement lifestyle.
About this calculator
This calculator grows each partner's current savings and ongoing contributions independently, then combines them into one household nest egg. Existing savings compound at your entered annual return rate (currentSavings × (1 + return)^years), while monthly contributions are grown using the standard future-value-of-an-annuity formula, which accounts for every contribution compounding for a different number of remaining months. The number of years to grow is based on the *older* partner's retirement date, since that's when the household actually starts drawing down savings. Once it has your projected combined nest egg, it applies the classic "4% rule" — withdraw 4% of your balance in the first year, adjusted for inflation thereafter — to estimate a sustainable monthly income, then adds both partners' Social Security estimates to find your total retirement income — reported as Combined Monthly Retirement Income — and compares that against your stated desired monthly income to surface a gap or surplus.
It also separately estimates how many years your nest egg will last: it subtracts your combined Social Security benefit from your desired monthly income to find the annual gap savings must cover, then uses a real (inflation-adjusted) return rate to calculate how long withdrawing that gap will sustain the balance. Social Security isn't excluded from this figure — a bigger combined benefit shrinks the gap and stretches the years-of-income result. It caps at 100 years both when Social Security alone covers your desired income and when your real return rate sustains withdrawals indefinitely. Two big assumptions to keep in mind: the return rate is treated as constant and steady every year, when real markets are volatile and sequence-of-returns risk (a downturn early in retirement) can be far more damaging than the same average return spread evenly; and Social Security estimates you enter are only as good as your own estimate — check your actual statement at ssa.gov rather than guessing.
Financial Disclaimer
This calculator is for educational purposes only and does not constitute financial advice. Results are estimates based on the inputs provided. Consult a qualified financial advisor before making investment or financial planning decisions.
Inputs
Results
Projected Nest Egg
$2,575,555.00
≈ 6 average U.S. homes
4% Rule Monthly Income
$8,585.18
How to Use This Calculator
- Enter each partner current age, retirement age, and current retirement savings.
- Set each partner annual contribution and expected investment return rate.
- Input estimated monthly retirement income needed in today dollars.
- Review the projected retirement nest egg and monthly income from savings.
- Identify any shortfall and adjust contributions or retirement age accordingly.
How the result changes with Target Retirement Age
| Target Retirement Age | Projected Nest Egg | 4% Rule Monthly Income |
|---|---|---|
| 33 | $155,210.00 | $517.37 |
| 49 | $704,457.00 | $2,348.19 |
| 80 | $7,660,692.00 | $25,535.64 |
What each input means
- Partner 1 Current Age
- Partner 1's current age.
- Partner 2 Current Age
- Partner 2's current age.
- Target Retirement Age
- Age at which the older partner plans to retire.
- Partner 1 Current Savings ($)
- Partner 1's current retirement savings (401k, IRA, etc.).
- Partner 2 Current Savings ($)
- Partner 2's current retirement savings.
- Partner 1 Monthly Contribution ($)
- Partner 1's monthly retirement contribution (including employer match).
- Partner 2 Monthly Contribution ($)
- Partner 2's monthly retirement contribution (including employer match).
- Expected Annual Return (%)
- Average annual investment return. Historical stock market average is ~7% after inflation.
- Expected Inflation (%)
- Assumed annual inflation rate for real-return calculations.
- Desired Monthly Retirement Income ($)
- How much monthly income you want in retirement (today's dollars).
- Partner 1 Est. Social Security ($/mo)
- Partner 1's estimated monthly Social Security benefit.
- Partner 2 Est. Social Security ($/mo)
- Partner 2's estimated monthly Social Security benefit.
What each result means
- Projected Nest Egg
- Combined projected retirement savings at your target retirement age.
- Partner 1 Savings at Retirement
- Partner 1's projected savings at retirement.
- Partner 2 Savings at Retirement
- Partner 2's projected savings at retirement.
- 4% Rule Monthly Income
- Sustainable monthly withdrawal from the nest egg using the 4% rule, before Social Security.
- Years of Retirement Income
- How many years your savings will last at your desired withdrawal rate.
- Monthly Income Gap
- Shortfall (positive) or surplus (negative) vs your desired monthly income using 4% rule + Social Security.
- Years to Retirement
- Number of years until target retirement age.
- Total Contributions
- Total amount contributed by both partners over the remaining working years.
- Combined Monthly Retirement Income
- 4% rule withdrawal plus both partners' Social Security.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersPartner 1 Current Age = 35, Partner 2 Current Age = 33, Target Retirement Age = 65, Partner 1 Current Savings ($) = 85000 = 12 input(s) provided
- Calculate Projected Nest EggProjected Nest Egg = fvSavings1 + fvSavings2 + fvContrib1 + fvContrib22575555 = $2,575,555
- Calculate 4% Rule Monthly Income4% Rule Monthly Income = totalAtRetirement * 0.04 / 128585.18 = $8,585.18
- Calculate Partner 1 Savings at RetirementPartner 1 Savings at Retirement1623018 = $1,623,018
- Calculate Partner 2 Savings at RetirementPartner 2 Savings at Retirement952537 = $952,537
Engine last updated . Checked against 3 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Why is the number of years to retirement based on the older partner, not each partner separately?
yearsToRetirement is calculated as retirementAge minus the *older* of the two current ages, because the household's combined savings start getting drawn down as soon as the first (older) partner hits the target retirement age, regardless of when the younger partner would reach it individually. Both partners' savings and contributions are then grown for that same number of years, even if the younger partner would technically have more working years left.
How does the calculator use the 4% rule alongside Social Security?
The 4% Rule Monthly Income (totalAtRetirement × 0.04 / 12) is calculated purely from your projected nest egg and represents a commonly cited sustainable withdrawal rate. Combined Monthly Retirement Income then adds both partners' Social Security estimates on top of that withdrawal, and the Monthly Income Gap is simply your Desired Monthly Retirement Income minus that combined total — so Social Security supplements the 4% figure rather than being baked into it.
What does 'Years of Retirement Income' actually mean if it shows 100 years?
100 is a cap, not a literal answer — it's shown whenever your combined Social Security alone covers your desired income (no savings drawdown needed), or when your real, inflation-adjusted return rate is high enough to sustain your desired withdrawal indefinitely without depleting the balance. Anything below 100 is a genuine projected duration, calculated from how fast the remaining balance is depleted after accounting for real (inflation-adjusted) investment growth.
Why do monthly contributions grow differently than a lump sum of current savings?
Current savings compound as a single lump sum using currentSavings × (1 + annualReturn)^years, since the whole balance earns returns for the full period. Monthly contributions use the future-value-of-an-annuity formula instead, because each individual contribution only compounds for the months remaining after it's made — the first contribution grows for nearly the whole period, while the last one barely grows at all, and the annuity formula accounts for that mix correctly.
Related Calculators
The questions that sit next to this one — chosen by subject, including calculators filed under a different category.
Retirement Income Calculator
Calculate retirement income from savings using the 4% rule or custom withdrawal rate. Plan your retirement withdrawals.
Couples FinanceDual Income Housing Ratio Calculator
Calculate front-end and back-end debt-to-income ratios for dual-income households. See if your housing costs meet the 28/36 rule and estimate your maximum affordable home price.
Zero-Budget PlanningCouples Budget Merger
Combine two individual zero-based budgets into a joint household budget with flexible expense splitting.
Couples FinanceFinancial Compatibility Score Calculator
Rate your financial compatibility as a couple across six dimensions: savings habits, spending style, debt tolerance, risk appetite, goal alignment, and communication.
Couples FinanceNew Baby Budget Impact Calculator
Estimate the monthly and first-year financial impact of having a baby, including childcare, supplies, insurance changes, and potential income reduction from parental leave.
More in Budgeting & Personal Finance.