Pension Calculator — Contribution Growth Projection & 4% Rule Withdrawal
Project your pension balance from now through retirement. See your projected balance, inflation-adjusted value, and 4% Rule monthly payout with a free PDF report.
Pension Calculator
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Estimated Monthly Payout (4% Rule)
$3,495.66/mo
Annual Growth Rate Used
6.00%
Projection Period
30 years (Age 35 → 65)
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Balance Over Time
$500/mo contribution at 6.00% annual growth
Year-by-Year Projection
| Year | Age | Start Balance | Contributions | Growth | End Balance |
|---|---|---|---|---|---|
| 1 | 36 | $100,000 | $6,000 | $6,000 | $112,000 |
| 4 | 39 | $138,203 | $6,000 | $8,292 | $152,495 |
| 7 | 42 | $183,704 | $6,000 | $11,022 | $200,726 |
| 10 | 45 | $237,896 | $6,000 | $14,274 | $258,170 |
| 13 | 48 | $302,439 | $6,000 | $18,146 | $326,586 |
| 16 | 51 | $379,312 | $6,000 | $22,759 | $408,070 |
| 19 | 54 | $470,868 | $6,000 | $28,252 | $505,120 |
| 22 | 57 | $579,913 | $6,000 | $34,795 | $620,707 |
| 25 | 60 | $709,787 | $6,000 | $42,587 | $758,374 |
| 28 | 63 | $864,469 | $6,000 | $51,868 | $922,337 |
| 30 | 65 | $983,678 | $6,000 | $59,021 | $1,048,698 |
The Formula
This is a standard defined-contribution growth projection. Each year, your existing balance earns a return at the specified annual growth rate, and your annual contributions (monthly × 12) are added. Unlike a defined-benefit pension (which promises a fixed payout based on salary and years of service), this models a retirement account whose value depends entirely on contributions and investment returns.
Variable Definitions
Annual Growth Rate
Expected annual return on your pension investments. A balanced 60/40 portfolio historically returns 6–8% before fees. Use 4–5% for conservative estimates.
Safe Withdrawal Rate
The Trinity Study guideline: withdrawing 4% of your portfolio annually (adjusted for inflation) has historically lasted 30+ years. Your estimated monthly payout uses this rule.
Inflation Adjustment (3%)
If enabled, projected balances are discounted by 3% annually to show what the future value is worth in today's dollars.
How to Use This Calculator
- 1
Enter your current age and the age you plan to retire.
- 2
Enter your current pension/retirement balance and how much you contribute monthly.
- 3
Set your expected annual growth rate — use 6% as a moderate estimate for a balanced portfolio.
- 4
Toggle inflation adjustment to see future values in today's purchasing power.
- 5
Scroll down to view the year-by-year projection table and use the Download PDF Report button for a printable summary.
Common Applications
- Project your pension or retirement account balance at retirement age based on current savings, monthly contributions, and expected growth rate.
- See how increasing your monthly contributions or adjusting your asset allocation affects your final retirement nest egg.
- Compare inflation-adjusted projections against nominal projections to understand your true retirement purchasing power.
Time is the single most powerful factor in retirement savings -- starting just 5 years later can reduce the final balance by roughly 30%
Understanding the Concept
The single most powerful factor in retirement savings is time, not rate of return. A 30-year-old with $50,000 growing at 7% with $500/month contributions will have ~$900,000 at 65 — with $260,000 of that being contributions and $640,000 being growth. Starting just 5 years later cuts the final balance by roughly 30%. This calculator models the exact compounding mechanics: your growth each year is proportional to your current balance, which is why the early years look flat and the later years explode upward. The 4% rule monthly payout is a planning estimate — your actual safe withdrawal rate depends on your asset allocation, retirement duration, and sequence of returns risk.
Frequently Asked Questions
Sources & References
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