Average Stock Price Calculator
Calculate your average stock purchase price across multiple buy orders. Enter each transaction to find your true cost basis and weighted average price per share.
You buy 100 shares at $50, then 50 more shares at $40 when the price dips. Your average cost becomes $46.67 per share — not $45, because you own more shares at the higher price. If the stock recovers to $50, you profit on all 150 shares.
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Averaging Down Strategy
Understanding cost averaging in the stock market
Why does average price matter?
Your average purchase price (cost basis) determines your break-even point — the price at which you neither profit nor lose. Every time you buy more shares at a different price, your cost basis shifts. Knowing this number is essential for making informed sell decisions.
For example, if you buy 100 shares at $50 and later 200 shares at $35, your average drops to $40 per share. The stock only needs to recover to $40 for you to break even — not back to $50. This is why tracking your true cost basis matters more than remembering individual purchase prices.
When should I average down on a stock?
Averaging down — buying more shares after a price drop — only makes sense if you believe the company's fundamentals are still strong and the decline is temporary. Never average down just because a stock is cheaper; a falling price can signal real problems.
Before adding to a losing position, ask: Has anything changed about why I bought this stock? If the original investment thesis is intact and you have conviction, averaging down can improve your position. If the fundamentals have deteriorated, it may be better to cut your losses.
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