Stock Average Calculator

Calculate your average stock purchase price across multiple buys. Determine cost basis, breakeven price, and current profit/loss.

Number of shares in first purchase

Optional second purchase

To calculate current P&L

Average Price = Total Cost / Total Shares\nTotal Cost = Σ(Shares * Price per Share)\nTotal Shares = Σ(All Shares Purchased)\nProfit/Loss = (Current Price * Shares) - Total Cost\nBreakeven = Average Price
Example:\nPurchase 1: 100 shares @ $50 = $5,000\nPurchase 2: 50 shares @ $60 = $3,000\nPurchase 3: 75 shares @ $45 = $3,375\n\nTotal Shares: 100 + 50 + 75 = 225\nTotal Cost: $5,000 + $3,000 + $3,375 = $11,375\nAverage Price: $11,375 / 225 = $50.56\n\nIf current price = $55:\nCurrent Value: 225 * $55 = $12,375\nProfit: $12,375 - $11,375 = $1,000 (+8.79%)

What is average stock price and why does it matter?

Average stock price is the weighted average cost per share across multiple purchases. It matters because it determines your actual cost basis for profit/loss calculations and tax reporting. If you buy 100 shares at $50 and 50 shares at $60, your average is $53.33, not $55.

How do I calculate average stock price?

Total Cost Method: Add all purchase costs (shares * price), then divide by total shares. Formula: Average Price = (Σ(Shares * Price)) / Total Shares. Example: Buy 100@$50 + 50@$60 = ($5,000 + $3,000) / 150 = $53.33 per share.

What is dollar-cost averaging (DCA)?

Dollar-cost averaging is investing a fixed amount regularly regardless of price. When prices are low, you buy more shares; when high, fewer shares. This averages out your purchase price over time, reducing timing risk and volatility impact.

Should I average down on a losing stock?

Averaging down (buying more at lower prices) lowers your average cost but increases risk exposure to a declining stock. Only average down if: 1) fundamentals remain strong, 2) decline is temporary, 3) you have conviction. Never "catch a falling knife" without research.

How does averaging affect my breakeven point?

Your breakeven is your average cost per share. If you bought 100@$50 (total $5,000) then the stock drops to $40, you're down $1,000. If you buy 100 more @$40 ($4,000), your new average is $45. Now you only need the stock to reach $45 to break even, not $50.