401(k) Growth Calculator
Estimate retirement savings with compound growth
Estimated balance at retirement
How to Use This 401(k) Growth Calculator
- Enter your current age and planned retirement age
- Enter your current 401(k) balance
- Enter your annual salary and contribution percentage (pre-tax)
- Enter your expected annual return (typical range: 5–10%)
- Click Calculate — see your estimated balance at retirement
Formula Used (Compound Growth with Annual Contributions)
The calculator uses the compound interest formula with annual contributions:
Future Value = Current Balance × (1 + r)n + [Annual Contribution × ((1 + r)n - 1) ÷ r]
Where: r = annual return rate (as decimal), n = number of years until retirement
Real Example
Input: Age 30, Retirement 65 (35 years), Balance $25,000, Salary $75,000, Contribution 10% ($7,500/year), Return 7%
Year 1: ($25,000 + $7,500) × 1.07 = $34,775
Year 35: Estimated balance ≈ $1,180,000
Why Use This 401(k) Calculator?
- ✅ Free & Instant — No signup, no email required
- ✅ Realistic Projections — Uses standard compound growth formula
- ✅ Employer Match Ready — Add your match separately (increase contribution %)
- ✅ Retirement Planning Tool — See if you're on track for your goals
- ✅ Mobile Friendly — Works on phone, tablet, desktop
Frequently Asked Questions
What is a good 401(k) balance by age?
General guidelines (Fidelity):
Age 30: 1× annual salary
Age 40: 3× annual salary
Age 50: 6× annual salary
Age 60: 8× annual salary
Age 67: 10× annual salary
Does this calculator include employer match?
Not directly. To factor in employer match, add the match percentage to your contribution percentage. Example: You contribute 6%, employer matches 3% → enter 9% as contribution.
What return rate should I use?
Historical average for S&P 500: 7–10% before inflation. For conservative planning, use 5–6% (inflation-adjusted). For aggressive, use 8–10%.
Is this guaranteed?
No — this is an estimate only. Market returns vary. Future performance depends on investments, fees, and economic conditions.
Related Retirement & Investment Calculators
- Retirement Calculator — Complete retirement planning tool
- Investment Return Estimator — Lump sum growth projection
- Inflation Impact Calculator — See how inflation reduces purchasing power
- Compound Interest Calculator — With monthly contributions
Disclaimer: This 401(k) growth calculator provides estimates for illustrative purposes only. Actual returns vary based on investment choices, fees, market conditions, and timing. Consult a financial advisor for retirement planning tailored to your specific situation.