Calculated using standard mathematical and industry formulas.
Estimate total retirement accumulation and safe monthly withdrawal income using compound interest formulas and the 4% Safe Withdrawal Rate rule. Saving $600 monthly at 7% return over 30 years accumulates $1,098,565 in retirement savings, yielding $3,661 in monthly income.
How to use this calculator?
Enter your current age and your planned retirement age.
Enter your existing retirement portfolio balance across 401(k), IRA, and brokerage accounts.
Enter how much cash you save and invest every month.
Set your expected annual investment return (historically 7% to 10% for stock market index funds).
Read your total projected retirement nest egg at age 65 and sustainable monthly income based on the 4% rule.
Retirement Nest Egg A = P × (1 + r)^t + PMT × [ ((1 + r)^t - 1) / r ]; Safe Monthly Income (4% Rule) = (Retirement Capital × 0.04) / 12
r = monthly return rate, n = total compounding months until retirement age.
Step-by-step calculation example
Age 30 to 65 (35 yrs) with $50,000 initial + $500/mo @ 7% return → Projected Nest Egg: $1,407,242 (Generates $4,691/mo sustainable 4% income).
Key insights to remember
The 4% Rule states that withdrawing 4% of your total portfolio in your first year of retirement (adjusted for inflation thereafter) provides a 95% probability of lasting 30 years.
Compounding returns mean money invested in your 20s and 30s grows 5x to 10x larger than money saved in your 50s.
Employer 401(k) matching contributions provide an instant 50% to 100% return on your saved dollars.
Increasing your monthly contribution by just $100/mo over 30 years adds ~$120,000+ to your final retirement balance at a 7% return.
How to interpret your results?
The 4% Safe Withdrawal Rule (Trinity Study)
Withdrawing 4% of your initial portfolio value in year one (adjusted for inflation thereafter) historically sustains retirement spending across a 30-year horizon without depletion.
Expert advice & guidance
💡 Retirement tip: Boosting your savings rate by just 2% or postponing retirement by a single year exponentially increases safe monthly withdrawal income due to extended compounding.
Frequently asked questions
How much should I save for retirement?
Financial experts recommend saving at least 15% of your annual gross income toward retirement starting in your 20s or 30s. General milestones target saving 1x your annual salary by age 30, 3x by 40, 6x by 50, and 10x by 67.
What is an IRA (Individual Retirement Account) and how does it work?
An Individual Retirement Account (IRA) is a tax-favored investment account holding stocks, bonds, or mutual funds. Traditional IRAs offer tax-deductible contributions with taxed withdrawals, while Roth IRAs use after-tax funds for tax-free growth and withdrawals.
How much should I contribute to my 401(k)?
Always contribute enough to your 401(k) to claim 100% of your employer matching match (free money). Financial planners suggest escalating total 401(k) contributions to 10%–15% of gross annual salary over time.
How long will my money last in retirement?
Applying the 4% Safe Withdrawal Rate rule (withdrawing 4% of your initial retirement portfolio and adjusting for inflation annually) typically ensures your savings sustain your lifestyle for 30+ years without running out.
Related calculators
Compound Interest Calculator: Savings Growth — Calculate compound interest and future portfolio balance with monthly deposits. Visualize exponential wealth accumulation with compounding returns.
Savings Goal Calculator: Monthly Deposit Plan — Calculate how much to save each month or how long it takes to reach your financial savings goal. Plan with compound interest, HYSA rates, and 50/30/20 budgets.
Salary Calculator: Hourly to Annual Wage — Convert between hourly wage, daily, weekly, monthly, and annual salary. Calculate take-home earnings and overtime pay based on customized work schedules.