The average cost isn't just the middle of two prices; it's weighted by the number of shares. For example, if you own 1 share at $100 and buy 10 shares at $50, your average cost isn't $75 (the midpoint)—it's $54.54. This is because your new, cheaper shares represent a much larger portion of your total position. Our calculator allows you to solve for the missing piece: "How many shares do I need to reach my goal price?"

Seeing a "red" position in your portfolio can be emotionally taxing. By averaging down, you move the "breakeven" finish line closer to the current market price. This often provides the mental fortitude to hold onto a quality company through a temporary dip rather than panic selling at the bottom. However, this strategy should only be used if you remain confident in the company's long-term value.

Never average down on a "broken" company. If a stock falls because its competitive advantage has vanished, its management is fraudulent, or it's nearing bankruptcy, buying more is simply "throwing good money after bad." This is known as a "Value Trap." Professional investors distinguish between an "earnings dip" (temporary) and "structural decline" (permanent).

The biggest danger of averaging down is over-concentration. By constantly buying more of your "losers," you might inadvertently make one struggling stock represent 30% or 50% of your total portfolio. This violates the core rule of diversification. Always set a maximum limit (e.g., 5-10% of total assets) for any single stock before you start averaging down.

Yes, and it's actually much safer. Since an ETF represents hundreds or thousands of companies, the risk of a total "zero" is almost non-existent. Many legendary investors, like Warren Buffett, recommend aggressively averaging down on broad market indices (like the S&P 500) during market crashes, as you are essentially "buying the world at a discount."

Don't let your past purchase price dictate your future decisions. Just because you bought at $100 doesn't mean the stock "must" go back there. Every time you consider averaging down, ask yourself: "If I didn't own any shares today, would I buy it at the current price?" If the answer is no, then don't buy more just to fix your average.