If I Invested in S&P 500 ETF 15 Years Ago

See how S&P 500 ETF has performed over the past 15 years and calculate your hypothetical returns. Compare recent performance against long-term averages.

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About This Calculator

Ever wondered what your investment invested in S&P 500 ETF 15 years ago would be worth today? Our calculator uses real historical price data to show you exactly how S&P 500 ETF has performed, including adjusted prices that account for stock splits and dividends.

Historical backtesting like this helps investors understand an asset's risk-return profile, evaluate timing decisions, and set realistic expectations for future performance. Past performance doesn't guarantee future results, but it provides valuable context.

Run your own analysis with the full Investment Return Calculator — select any date range and investment amount to see detailed results.

Frequently Asked Questions

How accurate are the S&P 500 ETF historical price calculations?

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Our calculator uses adjusted closing prices from reliable financial data sources. "Adjusted" means the prices account for stock splits, dividends, and other corporate actions, giving you the true total return — not just the raw price change.

Does the calculator include dividends and stock splits?

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Yes. We use adjusted price data, which factors in dividends and stock splits automatically. This means the returns you see reflect the total return an investor would have earned, including reinvested dividends.

Can past performance predict future returns?

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No — past performance is not indicative of future results. Historical analysis is valuable for understanding an asset's volatility, risk characteristics, and how it has responded to different market conditions, but it cannot predict what will happen next. Always diversify and invest according to your risk tolerance.

Why do different calculators show slightly different returns?

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Differences usually come from: (1) whether adjusted or unadjusted prices are used, (2) the exact data source, (3) whether dividends are assumed reinvested, and (4) the exact date used when a date falls on a weekend or holiday. Our calculator uses adjusted closing prices for the most accurate total return.

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