Free Stock Average Down (DCA) Calculator
When you buy additional shares at a lower price, your average cost basis drops. Enter your original position and the new purchase — the calculator returns your new average price, total cost, total shares, and the price you need to break even.
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How to use this calculator
Formula:
New Average = (Old Shares × Old Price + New Shares × New Price) ÷ (Old + New Shares)
Averaging down can be a sound strategy on quality assets that have temporarily declined — or a way to throw good money after bad. The key question: would you buy this position fresh at the current price? If yes, averaging down is fine. If no, you're just trying to avoid the realization of a loss.
Same math applies to dollar-cost averaging (DCA) — periodic equal-dollar purchases regardless of price. DCA tends to outperform lump-sum only in declining markets; over long horizons, lump-sum wins statistically.