Asset Allocation Calculator
Find the recommended asset allocation based on age, risk tolerance, and goals.
What this calculator does
This calculator suggests a starting allocation across stocks, bonds, and cash based on your age and risk tolerance. It applies the widely used 110 minus age rule to set the equity share, adjusts it by 10 percentage points for a conservative or aggressive stance, and splits the remainder between bonds and cash.
The reason age drives the answer is time, not caution. Equities have delivered the highest long-run returns and also the deepest drawdowns, so what matters is whether you have enough years to sit through a bad decade. At 30 you do; at 68 with withdrawals starting, you may not.
When to use it
Use it when opening a new brokerage or IRA account and you need a defensible starting point, or when a birthday and a market run have left you wondering whether your current mix still fits. It is a sanity check rather than a prescription — a useful anchor against which to judge what you actually hold.
It is also the right first step before rebalancing, since you cannot rebalance without a target. Where it is less appropriate is any situation with a hard deadline. Money needed for a house down payment in two years should not be allocated by age at all; that is a savings question, not an investment one.
Understanding the inputs
Age is the primary driver, standing in for your investment horizon. If you plan to work well past 65 or expect to leave a substantial portfolio to heirs, your effective horizon is longer than your age suggests and a higher equity share is defensible.
Risk tolerance shifts equity by 10 points either way. Be honest here — the right answer comes from your behavior in past downturns, not from how you feel during a rising market. The output splits the non-equity portion between bonds and cash. Cash of 5 to 10 percent is typical, covering near-term needs and letting you buy during a fall without selling anything.
How is this calculated?
The blended expected return is the weighted average of each asset class's expected return, weighted by its share of the portfolio. Weights are normalized, so a split that does not total 100 percent is scaled rather than rejected. Each class's contribution shows how much of the overall return it is responsible for.
A worked example
Take a 40-year-old with moderate risk tolerance. The rule gives 110 minus 40, or 70 percent stocks, leaving 30 percent split between bonds and cash — say 22 percent bonds and 8 percent cash. On a $200,000 portfolio that is $140,000 in stocks, $44,000 in bonds, and $16,000 in cash.
The same person choosing an aggressive stance moves to 80 percent stocks, or $160,000. In a 30 percent equity drawdown, the moderate portfolio falls about $42,000 while the aggressive one falls $48,000 — a $6,000 difference that sounds tolerable in the abstract and rarely feels that way in the moment. That gap is the entire content of the risk tolerance question.
Limitations and assumptions
This is a rule of thumb, not personalized advice. It knows nothing about your income stability, your other assets, whether you have a pension, how much debt you carry, or what you need the money for. Two 45-year-olds with identical portfolios can warrant very different allocations.
It also models three broad buckets and cannot address international versus domestic equity, credit quality or duration within bonds, or alternatives. Historical asset class returns do not predict future ones, and no allocation prevents losses — a conservative portfolio still fell in 2022 when stocks and bonds declined together. Treat the output as a conversation starter, not investment advice.
Common Questions
- What is the 110 minus age rule?
- A shorthand for how much of a portfolio should sit in stocks: subtract your age from 110. At 40 that suggests 70 percent stocks, with the remaining 30 percent in bonds and cash. The older rule used 100, but longer lifespans and decades of retirement have pushed the convention upward.
- Is a rule of thumb good enough?
- As a starting point, yes. It captures the one thing that matters most — that your equity share should fall as your investing horizon shortens. What it ignores is everything personal: your other income, job security, existing wealth, and how you actually behaved the last time markets fell 30 percent.
- How much does risk tolerance change the answer?
- This calculator moves the equity allocation by 10 percentage points in each direction — conservative subtracts 10, aggressive adds 10. At 40, that spans 60 to 80 percent stocks. That range covers most reasonable positions; anyone wanting to go outside it should have a specific reason rather than a recent market view.
- Why does allocation matter more than stock picking?
- Because the split between stocks and bonds explains the large majority of a portfolio's return variation over time, far more than which individual holdings you chose. Getting the allocation roughly right and leaving it alone beats getting the security selection precisely right within the wrong allocation.
- Should bonds be in a taxable account or an IRA?
- Generally an IRA or 401(k). Bond interest is taxed as ordinary income at your marginal rate, while qualified dividends and long-term capital gains on stocks are taxed at 0, 15, or 20 percent. Placing the tax-inefficient asset inside the shelter is worth real money over decades.
- What is my true risk tolerance?
- It is what you did in March 2020 or in 2008, not what you say in a questionnaire. If you sold during a fall, your genuine tolerance is lower than you think, and a smaller equity allocation you can actually hold beats a larger one you abandon at the bottom.
- Does the rule work for retirees?
- Partly. At 65 it suggests 45 percent stocks, which is reasonable for someone with 25 or more years ahead. But a retiree with a pension and Social Security covering essential spending can afford more equity risk than the rule implies, because their necessary spending is not exposed to the market.
- Where does international exposure fit?
- Inside the equity slice. US investors typically hold 20 to 40 percent of their equities internationally, though global market weights would suggest closer to 40. This calculator does not split within stocks, so treat its equity number as a total and decide the geographic breakdown separately.
- What about crypto, gold, or real estate?
- They sit outside this three-bucket model. If you hold them, count them against the equity slice rather than treating them as additional, since they carry equity-like or greater volatility. Most advisers cap speculative alternatives at 5 percent of a portfolio, sized so a total loss would not change your plan.