401(k) Retirement Calculator
Project your 401(k) balance at retirement. See the impact of employer matching, contribution increases, and investment returns on your retirement savings.
How It Works
Enter your salary, contribution percentage, employer match, current balance, age, and expected return to project your 401(k) balance at retirement. See how much comes from your contributions, employer match, and investment growth — plus a sustainable monthly retirement income estimate using the 4% rule.
Formula
FV = P(1+r)^n + PMT × [((1+r)^n − 1) / r]
Where: FV = projected balance at retirement | P = current 401(k) balance | r = monthly return rate | n = months until retirement | PMT = combined monthly contribution (yours + employer match). Sustainable retirement income uses the 4% rule: FV × 4% ÷ 12.
Worked Example
Projecting a 401(k) from age 35 to 65
- Current balance: $25,000 at age 35
- Salary: $75,000; your contribution: 10% ($625/month)
- Employer match: 4% ($250/month, since match is capped at your contribution rate up to 4%)
- Combined monthly contribution: $875
- Expected annual return: 7%, over 30 years to age 65
- Projected balance at 65 ≈ $1,050,000
- Sustainable monthly income in retirement (4% rule) ≈ $3,500/month
Common Mistakes
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Contributing less than the employer match threshold
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If your employer matches up to 4% and you only contribute 2%, you're forfeiting free money every single paycheck. Always contribute at least enough to capture the full match.
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Assuming a constant return rate with no volatility
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Real investment returns vary year to year — a 7% average return doesn't mean a smooth 7% every year. This projection is a simplified estimate, not a guarantee.
Frequently Asked Questions
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DisclaimerThe results provided by this calculator are estimates and for informational purposes only. They do not constitute financial, legal, or professional advice. Please consult with a qualified professional for your specific needs.