Ask ten people what counts as a “good” investment return and you will get ten different numbers, most of them anchored to something they half-remember from a headline. The honest answer depends entirely on what you are comparing against, and over what timeframe.
The S&P 500’s long-run average annual return is often cited as roughly 10% nominal (about 7% after inflation) over many decades — but that figure smooths over years of -30% crashes and +30% rallies. A single year of 12% is not obviously “good” if the broader market returned 20% that year, and a year of -5% is not automatically bad if the market fell 15%.
The investment calculator uses a straight-line assumed return specifically because real returns cannot be predicted year to year — use it to see how a range of reasonable assumptions (5%, 7%, 9%) changes your outcome, rather than betting everything on a single optimistic number.
| Asset class | Typical long-run nominal return |
|---|---|
| Savings account / money market | 2–5% |
| Government bonds | 3–5% |
| Diversified stock index fund | 8–10% |
| Individual stocks | Highly variable, no reliable average |
| Real estate (price appreciation only) | 3–5%, historically, before rental income |
A fund charging a 1% annual expense ratio does not just cost “1%” — compounded over 30 years it can consume a fifth or more of your total growth. Run the same investment scenario through the calculator at 7% and at 6% (simulating a 1% fee) and compare the future-value gap; it is almost always larger than people expect.
A “good” return is one that beats inflation, beats the fees you are paying to earn it, and matches the level of risk you are actually comfortable holding through a bad year. Chasing a specific percentage without those three checks is how people end up in investments that do not fit their situation.
A 7% average return sounds identical whether you are investing for 3 years or 30, but the risk of a bad outcome is wildly different across those horizons. Over 30 years, historical data shows stock market downturns are reliably followed by recoveries well within the timeframe. Over 3 years, there is a meaningful chance of finishing lower than you started, purely from bad timing. This is why the same 7–10% assumption that is reasonable for a retirement account decades away becomes far riskier advice for a house down payment you need in two years. Match the assumed return — and the volatility you are willing to accept — to how soon you actually need the money, not to the headline number a longer-term portfolio might produce on average.
A common mistake is comparing a diversified, moderate-risk portfolio's return against a single hot stock or fund that had an exceptional year. That is not a fair comparison — it is survivorship bias in miniature. The fairer benchmark is a diversified index matching your own asset allocation and risk level, over the same time period. If your portfolio is 60% stocks and 40% bonds, compare it to a blended 60/40 benchmark, not to the S&P 500 alone, which carries meaningfully more risk than a blended portfolio and should be expected to outperform it in most growth years.
Bottom line: a return is only meaningfully good or bad relative to a matched benchmark, your actual time horizon, and the fees quietly eating into it. Chasing an isolated percentage without those three checks is how reasonable investors end up disappointed by perfectly ordinary results.
No — occasional years like that happen, but no major asset class has sustained anywhere close to 20% annually over decades. Treat any investment promising consistent high double-digit returns as, at minimum, high-risk, and often a red flag.
Inflation-adjusted (real) return gives you a result in today's purchasing power, which is usually more useful for planning. If you use nominal return, remember the future dollar figure will buy less than it appears to.
On a $500,000 portfolio growing for 25 years, the difference between a 7% and 6% return (simulating a 1% fee) can easily exceed $600,000 in lost future value — fees compound against you exactly as returns compound for you.
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