SPY DCA Backtest
If you'd invested $700 every month, how long to $1M?
SPY tracks the S&P 500 — an index of 500 large U.S. companies — and, first listed in 1993, it's one of the oldest and largest ETFs in the world. Its full name is the SPDR S&P 500 ETF Trust. The easy way to picture it: buy a single share of SPY and you're spreading a little money across 500 of America's leading companies. It's the core asset most often mentioned first when you want to slowly accumulate the whole U.S. market.
Investing since Nov 2003, that's about $1M today · invested $191.1K · annualized +11%
Try it with your own numbers →
What is the S&P 500?
The S&P 500 is an index built from roughly 500 large companies listed on U.S. exchanges. It doesn't hold all 500 in equal amounts — the bigger a company (by market cap), the larger its weight. So giants like Apple and Microsoft carry an outsized influence.
An important point: this list of 500 isn't fixed. Companies that fall below the bar are dropped and newly grown ones are added on a regular schedule. Thanks to that, if one company fails, the whole index isn't tied to its fate. Buy SPY and you ride this self-refreshing basket as a whole.
Why it's 'less choppy' than QQQ
Even among large U.S. stocks, SPY and QQQ have different personalities. QQQ is tilted toward tech, whereas SPY is spread evenly across many sectors — tech, financials, healthcare, consumer, energy, and more. Because other sectors can cushion the blow when one falters, it's generally known to be less volatile than a tech-concentrated index.
Of course, 'less choppy' absolutely does not mean 'won't fall.' SPY also drops hard when the whole market sinks in a bear market. But its defining feature is spreading broadly across the U.S. economy rather than staking its fate on a single sector.
SPY as a long-term accumulation target
SPY isn't a leveraged product — it tracks the index at 1x. So it's largely free of the 'drag in sideways markets' (volatility loss) that hurts leveraged products like TQQQ and QLD. That's why it pairs well with dollar-cost averaging, where you steadily invest the same amount each month.
One thing to weigh is cost. SPY's expense ratio is around 0.09% per year — a small slice skimmed from assets annually. That's slightly higher than some rivals tracking the very same index (VOO is about 0.03%), and over a long horizon with a large balance, a lower fee compounds in your favor. The numbers in the result box above are computed from actual past prices on a dividend-reinvested basis, so they reflect total return, not price alone.
Handling your start date and expectations
Being the flagship U.S. index doesn't mean you get the same result no matter when you start. Whether you began accumulating right before a peak or right after a crash can make a real difference for the same fund. Dollar-cost averaging softens this luck-of-timing somewhat by automatically buying more when prices are cheap, but it doesn't erase it.
Above all, the fact that it trended upward in the past does not guarantee future returns (past ≠ future). This article is for information, not investment advice. Even for the same SPY, the outcome splits depending on your start date, so it's safer to run several scenarios through the calculator — varying amount, horizon, and goal — before deciding for yourself.
Want to change the amount, buy day, or goal? Use the button above to calculate it yourself.
Related reading
This content is for informational purposes and is not investment advice or a recommendation. You are solely responsible for your investment decisions.