Calculator
Longevity Risk Calculator
Estimate the probability of outliving retirement savings based on withdrawal rate and projected lifespan.
AnswerCanvas Calculator
Longevity Risk Calculator
Estimated years portfolio would last
60+ years (effectively indefinite)
At this withdrawal rate and return assumption, the portfolio does not appear likely to be depleted.
- Current withdrawal rate
- 4.94%
- Expected annual return
- 5.5%
- Estimated years portfolio lasts
- 60+
- Estimated age at depletion (if applicable)
- N/A
Result chart
Formula
This iteratively projects the portfolio balance forward year by year (growing by the expected return, then reducing by the annual withdrawal) until either the balance is depleted or 60 years pass. This is a SIMPLIFIED, single-scenario projection using CONSTANT assumed returns - real portfolios experience volatile, sequential returns (not a smooth constant rate), which is why this should be treated as one illustrative scenario, not a guarantee; running this with a range of more conservative and optimistic return assumptions gives a more complete picture of the genuine range of possible outcomes.
Worked example
$850,000 portfolio, $42,000 annual withdrawal (4.9% withdrawal rate), 5.5% expected annual return, starting at age 65: portfolio is estimated to last well beyond typical planning horizons at this withdrawal rate and return assumption.
Money-page insight
This single-scenario calculation, using a CONSTANT assumed return, significantly understates the REAL risk of running out of money - actual market returns are volatile and sequential (some years much worse, some much better than average), and the specific ORDER those returns occur in matters enormously (see the sequence-of-returns-risk calculator for this specific dynamic) - this is exactly why serious retirement withdrawal planning should consider a RANGE of scenarios (including notably poor early-retirement return sequences), not rely on a single constant-return projection like this simplified illustration.
Calculation history
Stored locally on this deviceHow the longevity risk calculator works
How to use this calculator
Adjust the assumptions on the left and the result updates instantly. Use the summary as a planning estimate, then compare it with quotes, local rules, lender disclosures, or professional guidance for decisions involving taxes, loans, construction, or health.
Learn more
Stage 1 - Inputs
Collect the required longevity risk assessment (educational) values and confirm that each value is physically and logically possible.
Stage 2 - Formula
This iteratively projects the portfolio balance forward year by year (growing by the expected return, then reducing by the annual withdrawal) until either the balance is depleted or 60 years pass. This is a SIMPLIFIED, single-scenario projection using CONSTANT assumed returns - real portfolios experience volatile, sequential returns (not a smooth constant rate), which is why this should be treated as one illustrative scenario, not a guarantee; running this with a range of more conservative and optimistic return assumptions gives a more complete picture of the genuine range of possible outcomes.
Stage 3 - Substitute values
Replace each variable in the formula with the current input value. This keeps the calculation transparent and easy to audit.
Stage 4 - Intermediate calculations
Calculate the supporting values first, such as totals, rates, balances, volumes, or ratios, before producing the final result.
Common mistakes
- Mixing units, such as monthly and annual rates, inches and feet, or gross and net income
- Entering rounded guesses when exact quotes or measurements are available
- Ignoring fees, taxes, risk factors, local rules, or physical constraints
- Treating an estimate as a final professional decision
Tips
- Change one input at a time to understand sensitivity
- Use conservative assumptions when the result affects safety, debt, taxes, or health
- Save or print the result with assumptions before comparing alternatives
- Recheck units whenever a result looks surprisingly large or small
Longevity Risk Calculator mastery
Estimate the probability of outliving retirement savings based on withdrawal rate and projected lifespan.
Use this retirement calculator as a working model: enter realistic inputs, read the primary answer first, then use the supporting rows to understand what changed and why.
Read the result correctly
Treat the primary answer as the headline result and the supporting values as the evidence trail behind it.
Improve accuracy
Small input changes can shift the output. Recheck units, time periods, percentages, and any assumptions before using the result.
Use it professionally
Save or print the result with the inputs visible so the calculation can be reviewed, repeated, or compared later.
Expert suggestions
Professional perspective
How to get more value from the longevity risk calculator
A strong calculation is not only a final number. It is a repeatable way to compare choices, understand assumptions, and see which inputs deserve the most attention.
Start with a baseline
Use the most realistic inputs you have today before testing optimistic or conservative cases.
Change one variable
Adjust one assumption at a time. This makes cause and effect easier to understand.
Keep the evidence visible
Save or export the result with inputs included so the answer can be checked later.
Learning path
What to understand next
- Understand the main formula
- Review the assumptions
- Compare alternate scenarios
- Decide what information would improve accuracy
Retirement insight guide
Understand the answer
Use the longevity risk calculator as a decision aid, not just a number.
A calculator is most useful when the result, assumptions, and practical meaning are read together. Use the output as a structured estimate and review the inputs before making a decision.
The primary answer summarizes the model. Supporting values explain the path from inputs to output and reveal which assumptions matter most.
The result usually changes when units, rates, time periods, quantities, prices, thresholds, or rounding assumptions change.
Confirm that each input uses the intended unit, time period, percentage basis, and sign. A correct formula can still produce a poor estimate from inconsistent inputs.
Use extra care when the answer affects money, health, safety, legal exposure, construction quantities, or long-term planning.
Accuracy checklist
- Confirm every unit before comparing outputs.
- Use current inputs rather than outdated estimates.
- Test at least one conservative and one optimistic scenario.
- Review whether rounding changes the practical decision.
How professionals use this
- Document the inputs beside the result.
- Compare scenarios instead of relying on a single run.
- Share the assumptions when asking for review.
- Use expert review for high-stakes decisions.
Frequently asked questions
- Why might this calculation understate the real risk of running out of money?
- This uses a CONSTANT assumed annual return, but real markets are volatile - actual returns vary significantly year to year, and a sequence of poor returns EARLY in retirement (even with the same long-run average return) can deplete a portfolio much faster than this smooth, constant-return projection suggests - this specific risk is explored further in the sequence-of-returns-risk calculator.
- What withdrawal rate is commonly cited as historically sustainable?
- A commonly cited reference point (often called the "4% rule") suggests roughly a 4% initial withdrawal rate (adjusted for inflation in subsequent years) has historically had a reasonably high probability of lasting 30 years in various historical scenarios - though this is a debated guideline, not a guarantee, and its applicability depends on your specific time horizon and market conditions.
- How should I use this calculator responsibly given its simplifications?
- Run it with a RANGE of return assumptions (including notably conservative ones, not just an optimistic average expectation) to see how sensitive your specific plan is to different market outcomes - treating a single favorable-assumption result as a guarantee, rather than one point in a range of possible outcomes, is exactly the mistake this simplified tool could otherwise encourage if used carelessly.
- What does the Longevity Risk Calculator calculate?
- Estimate the probability of outliving retirement savings based on withdrawal rate and projected lifespan.
- How should I read the Longevity Risk Calculator result?
- Read the primary answer first, then review the supporting values, formula notes, assumptions, and expert suggestions. The supporting values explain why the answer moved and which inputs deserve more attention.
- Which input matters most in the Longevity Risk Calculator?
- The most important input depends on the calculator, but the highest-impact variables are usually rates, time periods, quantities, income, balance, measurements, or unit choices. Change one input at a time to see which variable drives the result.
- Why might my Longevity Risk Calculator result differ from another website?
- Different calculators may use different assumptions, rounding rules, formulas, default values, tax years, unit conversions, or included costs. Compare the formula and assumptions before comparing final answers.
- Can I use this retirement result for an important decision?
- Use the result as a structured estimate and learning tool. For financial, tax, medical, legal, construction, or safety-sensitive decisions, verify the inputs and review the output with a qualified professional.
- How often should I update the inputs in the Longevity Risk Calculator?
- Update the inputs whenever the underlying facts change: rates, prices, measurements, dates, balances, income, rules, or goals. Outdated inputs create outdated answers.
- What is the safest way to compare scenarios?
- Keep all inputs the same except one variable. That makes it clear whether the difference came from rate, time, quantity, price, measurement, or another assumption.