Stock vs Stock Investing Calculator
What-If investing in one stock versus another over the exact same period
Calculator inputs
This amount is invested independently in each stock below -- not split between them.
Stock 1
- Market Return
- Starting Close Price
- Ending Close Price
- Investment Duration
Stock 2
- Market Return
- Starting Close Price
- Ending Close Price
- Investment Duration
Stock 1 vs Stock 2: Head-to-Head
Stock 1 vs Stock 2: Growth Over Time
What Does It Mean to Compare Two Stocks?
Comparing two stocks side by side means investing the same amount independently in each company's shares over the exact same historical period, then seeing which one grew more. Unlike comparing a stock to a savings account, both sides of this comparison carry market risk -- there is no guaranteed floor, and either stock (or both) can lose value over the period you select.
Why Compare Individual Stocks Instead of a Savings Account?
Comparing two stocks head-to-head helps answer a different question than "should I save or invest" -- it helps you see how one company's historical performance stacked up against another's over a specific window, which can be useful when deciding between two companies you are considering, or when reviewing how a past decision would have played out.
The Same Investment Amount, Two Independent Outcomes
This calculator invests your full initial amount independently in Stock 1 and separately (not split) in Stock 2, so you can see what the exact same dollar amount would have grown to in each company on its own, rather than a blended or divided outcome.
Choosing the Same Stock for Both Slots
You can select the same stock for both Stock 1 and Stock 2. In that case, both sides will show identical results and a 0% difference, which can be a useful way to confirm the calculator is working as expected before comparing two different companies.
Concentration Risk Applies to Both Sides
Unlike a diversified ETF, an individual stock's price reflects one company's earnings, leadership, competition, and industry trends directly. Since this calculator compares two individual stocks, both sides carry this concentration risk -- there is no diversification cushion on either side of the comparison.
Historical Performance Context
Two stocks selected for the same historical window can show dramatically different results depending on company-specific news, industry trends, and broader market conditions during that period. Past performance over any historical window, including the one you selected above, does not predict future results for either stock.
Important Investment Risks
Both stocks compared here can lose substantial value, including the possibility of losing most or all of the invested principal, and neither side is insured the way a bank deposit would be. The calculations on this page use historical closing prices only and exclude dividends, trading fees, and taxes, so real-world brokerage results will differ. This tool is for educational purposes only and is not personalized financial, investment, or tax advice.
Frequently Asked Questions
No. Unlike the other calculators on this site, the Compare calculator is stock vs stock only -- it does not include a savings account or interest rate. Both sides carry full market risk.
No. The full initial investment amount is applied independently to each stock, as if you made two separate investments of that same amount -- one in Stock 1 and one in Stock 2 -- rather than dividing one investment between them.
The calculator will run normally and show identical results on both sides, with a 0% difference. This is allowed rather than blocked, since it can be a useful sanity check.
Yes. Both sides of the comparison use actual historical closing prices for whichever two stocks you select, over the exact start and end dates you choose.
U.S. stock markets are closed on Saturdays and Sundays, so no closing price exists for those days. The calculator requires a business day (Monday through Friday) for both stocks so the comparison can use real, recorded closing prices.
No. This calculator compares historical closing prices only for both stocks and does not include dividends, dividend reinvestment, trading fees, or taxes.
Both Stock 1 and Stock 2 dropdowns list the same set of companies -- the current S&P 500 constituents -- so you can compare any two of them against each other, including picking from very different industries.
This calculator is provided for educational purposes only and does not constitute financial, investment, or tax advice. Returns shown are based on the historical closing-price performance of the two selected stocks and do not reflect dividends, trading fees, or taxes. Historical performance does not guarantee future results.