How much do I need to retire?

Common rule: 25x your annual expenses (4% withdrawal rate). If you spend $50,000/year, you need $1.25 million. Adjust based on Social Security, pensions, and lifestyle plans.

What's a realistic return rate?

Stock market historical average is 10%, but 7-8% is more conservative accounting for inflation and a balanced portfolio. As you near retirement, shift to more conservative investments (5-6%).

When can I access my 401(k)?

Penalty-free at 59½. Early withdrawal before 59½ incurs 10% penalty plus income taxes. Exceptions exist for hardship, disability, and Rule of 55 (leave job at 55+).

How does Social Security factor in?

Average monthly benefit is $1,800-$2,000. Full retirement age is 66-67 depending on birth year. This calculator shows personal savings; add Social Security separately when planning.

How much do I need to retire?

A common rule of thumb is 25× your expected annual retirement spending — this comes from the Trinity Study's 4% safe withdrawal rate. If you plan to spend $60,000/year in retirement, you need roughly $1.5 million in invested assets. Subtract expected Social Security income first: if Social Security covers $24,000/year, you only need to fund the remaining $36,000, so nest egg = $36,000 × 25 = $900,000.

Retirement Calculator

Calculate how much you'll have for retirement based on current savings and monthly contributions. Plan your financial future.

Reviewed by the Calcura editorial team · Last reviewed April 19, 2026

Question: How much do I need to retire?
Answer: A common rule of thumb is 25× your expected annual retirement spending — this comes from the Trinity Study's 4% safe withdrawal rate. If you plan to spend $60,000/year in retirement, you need roughly $1.5 million in invested assets. Subtract expected Social Security income first: if Social Security covers $24,000/year, you only need to fund the remaining $36,000, so nest egg = $36,000 × 25 = $900,000.

▸Show formula & caveats

Formula: nest_egg ≈ (annual_spending − Social_Security) × 25
Caveats: 4% is a rule of thumb from US market history; it may be conservative or aggressive depending on sequence-of-returns risk.
Doesn't account for inflation explicitly — use inflation-adjusted spending and real returns to stay consistent.
Assumes a balanced stock/bond portfolio; all-cash or all-stock portfolios change the safe rate.

Currency:

Current Age

Planned Retirement Age

Current Retirement Savings

Monthly Contribution

Expected Return Rate (%)

What This Calculator Does

This calculator projects your retirement-account balance at a chosen retirement age given your current balance, monthly contribution, years until retirement, and an assumed annual return. It separates the projection into money you actually contributed versus growth from compounding, so you can see both the plan and the assumption driving it. The output is a planning estimate — not a guarantee — and assumes a constant return. Taxes, fees, inflation, and Social Security are not modeled here and should be layered in separately.

When To Use This Calculator

Annual Retirement Check-In

You're 35 with $75,000 saved and contribute $600/month to your 401(k). Calculate your projected balance at 65 to see if you're on track for your $1.5 million goal. If you're short, see how increasing contributions to $750/month changes the outcome.

Starting Your First Job

You're 23 and your employer offers 401(k) matching. Calculate the difference between contributing just 3% ($150/month) versus the full match at 6% ($300/month). Over 42 years at 8% returns, that $150/month difference is worth $687,000.

Catching Up in Your 40s

You're 45 with only $80,000 saved but can now contribute $1,200/month. Calculate whether you can still reach a comfortable retirement by 65. The answer helps you decide if you need to work longer, save more aggressively, or adjust retirement lifestyle expectations.

Evaluating Early Retirement

You're 50 with $600,000 saved, contributing $2,000/month, and wondering if you can retire at 60 instead of 65. Calculate both scenarios to see the 5-year difference: approximately $800,000 less. This helps you weigh whether early retirement is financially feasible.

How It Works

This calculator uses the time value of money principle and compound interest formula to project retirement savings. Your current savings grows at the expected return rate through compound interest. Each monthly contribution also grows from the moment it's invested until retirement, with earlier contributions growing more than later ones. The formula accounts for monthly compounding, which is standard for most retirement accounts. The 'years until retirement' drives the compound growth—this is why starting early is so powerful. Even modest contributions over 30-40 years can build substantial wealth, while late starters need much higher monthly contributions to reach the same goals.

Formula

FV = PV(1+r)^n + PMT × [((1+r)^n - 1) / r] where FV = retirement balance, PV = current savings, r = monthly rate, n = months until retirement, PMT = monthly contribution

Real-World Example

Scenario

Sarah is 32 years old with $45,000 currently saved in her 401(k). She contributes $650/month (including employer match) and plans to retire at 67. She expects 7% average annual returns on her balanced portfolio.

Calculation

Current age: 32 • Retirement age: 67 • Years: 35 Current savings: $45,000 Monthly contribution: $650 Return rate: 7% annually (0.5833% monthly) Future value = $45,000(1.005833)^420 + $650 × [((1.005833)^420 - 1) / 0.005833] Future value = $481,000 + $1,052,000 = $1,533,000

Result

Sarah will have approximately $1.53 million at retirement. Her contributions total $318,000 (including the initial $45,000), meaning $1.21 million comes from investment growth—nearly 4x her contributions. Using the 4% withdrawal rule, she can withdraw $61,000 annually in retirement without depleting her savings.

Common Mistakes to Avoid

Mistake: Using overly optimistic return rates

Solution: Don't assume 12-15% returns. Use 7-8% for aggressive portfolios (stocks), 5-6% for conservative (bonds/near retirement), or 4-5% for very conservative. Unrealistic rates lead to false confidence and under-saving.

Mistake: Forgetting to account for employer 401(k) match

Solution: Include your employer match in monthly contributions—it's free money. If you contribute $500 and employer adds $200, enter $700. Not including the match makes you think you're behind when you're not.

Mistake: Not adjusting contributions as income increases

Solution: This calculator projects current contribution rates. In reality, contribute more as you earn more. Increase 401(k) contributions by 1-2% annually, especially when you get raises. Future-you will be grateful.

Mistake: Assuming this number equals retirement spending power

Solution: Taxes and inflation matter. Your $2 million in 35 years won't have today's buying power. Aim for 25-30x your expected annual spending to account for inflation. Also consider tax-deferred (401k) vs tax-free (Roth) accounts.

Retirement Calculator vs. Related Tools

Compound Interest Calculator

More general investment calculator without retirement-specific inputs like age and retirement age. Use this for any investment time horizon; use retirement calculator specifically for retirement planning.

Savings Growth Calculator

Simpler tool showing basic savings growth without monthly contributions. Use retirement calculator for comprehensive planning with regular contributions, which most retirement savers make.

Income After Tax Calculator

Shows your take-home pay after taxes. Use this to determine how much you can actually afford to contribute monthly to retirement, then plug that number into the retirement calculator.

When This Isn't the Right Tool

Required Minimum Distribution (RMD) planning

Use instead: IRS rules on when and how much you must withdraw from traditional retirement accounts are beyond the scope of this projection. See the IRS RMD page and consider a qualified tax advisor for distribution planning.

Modeling Social Security and pensions

Use instead: Use the Social Security Administration's own benefit estimator (ssa.gov) for your personalized Social Security projection, then layer that monthly income on top of this calculator's projected balance.

Monte Carlo / probability-of-success planning

Use instead: This calculator assumes a fixed return. A sequence-of-returns or Monte Carlo simulation gives a probability range instead of a point estimate. Consult a fiduciary financial planner for that level of modeling.

How to Verify This Calculation

Cross-check by splitting the math: run the starting balance alone through a compound-interest spreadsheet (=FV(rate/12, months, 0, -balance)) and the contributions alone (=FV(rate/12, months, -contribution)). The two future values should add up to the calculator's projected total.

Sources

U.S. Social Security Administration — Retirement Benefits — Official retirement benefit calculator and full retirement age reference.
IRS — Retirement Plan and IRA Contribution Limits — Current-year 401(k), IRA, and catch-up contribution limits.
U.S. Department of Labor — Savings Fitness — Federal consumer guide to retirement savings planning.
Consumer Financial Protection Bureau — Planning for Retirement — CFPB decision tool for Social Security claiming age.