Portfolio Longevity
Calculator
Results
- Years until the portfolio is depleted
- 30.998912
- Withdrawal rate at retirement (%)
- 5
- First year investment growth
- 24,000
Retirement planning results
| Years until the portfolio is depleted | 30.998912 |
| Withdrawal rate at retirement (%) | 5 |
| First year investment growth | 24,000 |
formula-map diagram
- Years until the portfolio is depleted
- 30.998912
- Withdrawal rate at retirement (%)
- 5
- First year investment growth
- 24,000
Retirement planning relationship
Formula
n = -ln(1 - P × r ÷ W) ÷ ln(1 + r)= 30.998912756564
Note
This is not financial advice. It is a simplified model: it applies the displayed standard formula to the figures you entered, assumes a single constant rate for every year, and ignores taxes, fees, sequence-of-returns risk, health costs, longevity risk and any country's specific pension, benefit or minimum-distribution rules. Real returns can be negative and real retirements rarely follow a smooth curve. Check the assumptions and consult a licensed adviser before acting on any figure.
More in Retirement planning
See all →Frequently asked questions
What does portfolio longevity actually estimate?+
It estimates how many years your savings could last given a starting balance, an assumed rate of return, and a fixed or inflation-adjusted withdrawal amount. It is a projection based on constant assumptions, not a forecast of actual market behavior.
Why can two people with the same balance get very different longevity results?+
Longevity is extremely sensitive to withdrawal rate and assumed return: a small increase in spending or a small drop in expected return can cut years off the result, sometimes dramatically. This sensitivity is why stress-testing several scenarios matters more than trusting one number.
What is 'sequence of returns risk' and why does it matter here?+
It's the risk that poor investment returns early in retirement do outsized damage, because withdrawals during a downturn lock in losses that a portfolio can't recover from later, even if average returns end up fine over time. A simple longevity calculator using one average return rate doesn't capture this risk directly.
Does the result mean my money runs out to exactly zero at that year?+
Essentially yes, under the model's assumptions — it finds the point where withdrawals exceed the remaining balance. In reality, few retirees mechanically spend a fixed schedule to zero; most adjust spending as their balance and circumstances change.
Should I plan for the average result or a worse-case scenario?+
Most planners suggest targeting a horizon somewhat longer than your expected lifespan (e.g. to age 90-95) and testing a lower-than-average return assumption, since underestimating longevity is far riskier than overestimating it.