📉 Stock Average Calculator
Calculate your average cost per share when buying stocks at different prices. Enter multiple purchase lots to find your break-even price and unrealized profit or loss.
Purchase Lots
| Lot | Qty | Price | Total | % of Portfolio |
|---|
Average Cost Formula
Dollar cost averaging (DCA) means buying fixed dollar amounts at regular intervals, naturally lowering your average cost when prices dip.
Example
Three purchases: 10 shares at $100, 20 shares at $80, 15 shares at $90.
Frequently Asked Questions
DCA is an investment strategy where you invest a fixed amount at regular intervals regardless of price. When prices are low you buy more shares; when high, fewer. Over time this typically lowers your average cost.
Averaging down means buying more shares after the price falls, which reduces your average cost per share. It can help if the stock recovers, but increases risk if it keeps falling.
Average up (buy more as price rises) when a stock is in a strong uptrend and you are adding to a winning position. Average down when you have high conviction in the company and the drop is temporary.
Studies show lump sum investing outperforms DCA about 2/3 of the time in rising markets. However, DCA is better for reducing emotional decisions and timing risk for most retail investors.
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