What This Calculator Does
You are 35 years old with $50,000 saved for retirement. You contribute $500 per month and expect a 7% annual return. Will you have enough to retire at 65? This calculator projects a balance of approximately $1,120,000 at retirement, generating about $6,533 per month in income. If your planned expenses are $4,000 per month, your savings last past age 88. But change the return to 5% and the balance drops to $760,000, with monthly income of only $3,167. The difference between 5% and 7% return over 30 years is $360,000.
Planning for retirement is one of the most important financial decisions you will ever make. Vanguard recommends saving 12% to 15% of your pay each year for retirement, including any employer contributions. For 2026, the IRA contribution limit is $7,500, or $8,600 for individuals age 50 and older, per Vanguard. The Roth IRA contribution limit is also $7,500, or $8,600 for those 50 and older. This tool projects your retirement nest egg by combining your current savings, ongoing contributions, and expected investment returns over time. It also estimates how long your savings will last based on your planned monthly expenses.
For projecting your 401(k) balance specifically, our 401(k) Calculator models employer matching and IRS contribution limits.
Inputs Required
- Current Age: Your age today
- Retirement Age: The age at which you plan to retire
- Current Savings: Total retirement savings you already have
- Monthly Contribution: How much you add to your retirement account each month
- Expected Annual Return: The average annual investment return you expect
- Monthly Expenses in Retirement: How much you expect to spend per month after retiring
Outputs Provided
- Projected Balance: Your estimated total savings at retirement
- Monthly Income: Estimated monthly income from your savings using the annual return rate
- Years Savings Will Last: How many years your nest egg covers at your expected spending rate
- Growth Chart: Year by year view of your balance accumulation
How the Calculation Works
The calculator uses compound interest to grow your savings over time. Each month, your existing balance earns a return, and your new contribution is added. The formula compounds monthly from your current age to your target retirement age.
FV = PV x (1 + r)^n + C x [((1 + r)^n - 1) / r]
- FV is the future value (projected balance at retirement)
- PV is the present value (current savings)
- r is the monthly interest rate (annual rate divided by 12)
- n is the total number of months until retirement
- C is the monthly contribution amount
The monthly income estimate uses the total balance multiplied by the annual return rate and divided by 12. This approximates a sustainable withdrawal that does not deplete the principal rapidly. For Roth IRA growth projections, our Roth IRA Calculator models tax-free retirement income.
How to Use the Calculator
- Enter your current age and your planned retirement age
- Input how much you have already saved for retirement
- Set your monthly contribution amount (aim for 12% to 15% of gross income per Vanguard)
- Enter your expected annual investment return (7% is a common long term average)
- Input your estimated monthly expenses in retirement
- Review your projected balance, monthly income, and how long your savings will last
Example Calculations
Example 1: Early Saver on Track
Consider someone aged 30 with $50,000 saved, contributing $500 per month with a 7% annual return, retiring at 65:
- Years until retirement: 35
- Projected retirement balance: approximately $1,120,000
- Estimated monthly income: approximately $6,533
If monthly expenses in retirement are $4,000, the savings would last over 23 years, comfortably covering a retirement through age 88.
Example 2: Late Starter Catching Up
A 45-year-old with $30,000 saved, contributing $1,500 per month at 7%, retiring at 67:
- Years until retirement: 22
- Projected retirement balance: approximately $1,050,000
- Estimated monthly income: approximately $6,125
The higher contribution compensates for the shorter compounding period. For estimating Social Security benefits to supplement this income, our Social Security Calculator projects retirement benefit amounts.
Real-World Scenarios
Late Starter Catching Up
James, a 45-year-old electrician in Cleveland, has only $30,000 saved. He realizes he is behind and uses the calculator to model different contribution levels. At $500 per month, he projects $560,000 at age 67. At $1,500 per month, he projects $1,050,000. The $990 difference in monthly contributions over 22 years creates a $490,000 gap in retirement balance. James increases his 401(k) contribution to 15% of his $95,000 salary and plans to maximize his $8,600 catch-up contribution limit for workers age 50 and older starting in five years.
Early Retiree Planning
Lisa, a 42-year-old software engineer in Austin, wants to retire at 55. She has $450,000 saved and contributes $2,500 per month at 7%. The calculator projects $1,380,000 at age 55, generating approximately $8,050 per month. Her planned expenses are $5,000 per month, so her savings would last approximately 24 years, through age 79. Lisa realizes she needs either a higher return, lower expenses, or a part-time income bridge to cover the gap between 55 and Social Security eligibility at 62. She adjusts her retirement age to 58, which increases her projected balance to $1,680,000 and extends her savings to age 86.
Checking if Current Savings Are on Track
The Martinez family in San Diego, both 40, have a combined 401(k) balance of $185,000 and contribute $1,800 per month total. They want to retire at 65 with $5,500 in monthly expenses. At 7% return, the calculator projects $1,420,000, generating $8,283 per month. Their savings would last over 25 years. They are on track. However, when they model a more conservative 5% return, the balance drops to $1,030,000 with $4,292 monthly income, which falls short of their $5,500 expense target. They decide to increase contributions by $300 per month to close the gap under conservative assumptions.
Why This Calculation Matters
Retirement planning is not something you can leave until the last decade of your career. The power of compound interest means that money saved early grows dramatically more than money saved late. Starting at 25 versus 35 can mean the difference of hundreds of thousands of dollars at retirement. Vanguard recommends saving 12% to 15% of your pay each year, including employer contributions. For 2026, the IRA contribution limit is $7,500 ($8,600 if age 50 or older), and the Roth IRA limit is the same. Maximizing these contributions early and consistently is the most reliable path to a comfortable retirement.
Common Mistakes to Avoid
- Overestimating returns: Using 10% or higher can give an unrealistic picture. A 6% to 7% long term average is more conservative and reliable. The S&P 500 returned 14.8% annually for the 10 years ending December 31, 2025, but that was an unusually strong period. Plan for lower returns and be pleasantly surprised
- Ignoring inflation: Your expenses in retirement may be higher in nominal terms due to inflation. Consider using a return rate net of inflation (for example, 7% nominal minus 3% inflation = 4% real return). A $4,000 monthly expense today could be $7,500 in 20 years at 3% inflation
- Forgetting Social Security: Social Security income can supplement your savings significantly and is not included here. The average monthly Social Security retirement benefit in 2026 is approximately $1,900. Add this to your projected investment income for a complete picture
- Underestimating expenses: Healthcare costs often increase in retirement. Fidelity estimates that a 65-year-old couple retiring in 2026 will need approximately $315,000 to cover healthcare costs throughout retirement. Budget conservatively
- Not updating the plan: Run this calculation at least once a year to stay on track. Life changes such as job loss, salary increases, or market downturns can significantly impact your projection
Limitations of This Calculator
This calculator models compound growth based on a constant annual return, while real investment returns vary year to year, sometimes dramatically. It does not account for sequence-of-returns risk, which is the danger of experiencing poor returns early in retirement when withdrawals begin. The calculator does not model Social Security benefits, pension income, or part-time work in retirement. It assumes constant monthly contributions and does not account for catch-up contributions available to workers age 50 and older. The monthly income estimate uses a simple return-on-principal calculation and does not model the 4% safe withdrawal rate rule, required minimum distributions (RMDs), or tax implications of withdrawals from different account types. For a comprehensive retirement plan, consult a certified financial planner.
Authoritative Research & Resources
- Vanguard: Saving for Retirement - Vanguard recommends saving 12% to 15% of your pay each year for retirement, including employer contributions. Includes guidance on retirement savings strategies and account types
- Vanguard: IRA Catch-Up Contributions - The 2026 IRA contribution limit is $7,500, or $8,600 for investors age 50 and older. Details on catch-up contribution rules and eligibility
- Vanguard: Roth IRA Income and Contribution Limits for 2026 - The 2026 Roth IRA contribution limit is $7,500, or $8,600 for individuals age 50 and older, with income phase-out limits for high earners