Investing Tools • Free Financial Tool

Stock Average Calculator

Bought shares at different price points? Calculate your exact weighted average cost per share, total shares owned, and break-even stock price across multiple purchases.

Calculator Inputs

Enter your values, then select Calculate Now

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Estimated Calculation Results

Your result
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Interactive Output
Enter your values and select Calculate Now to see your results.
Note: Select Calculate Now to refresh your estimate. Calculations run locally in your browser; your entries are not sent to a server.

fx Formula & Mathematical Methodology

Total Shares = Shares_1 + Shares_2. Total Cost = (Shares_1 * Price_1) + (Shares_2 * Price_2). Weighted Average Price = Total Cost / Total Shares. Current Value = Total Shares * Market Price. Unrealized P&L = Current Value - Total Cost.

\text{Average Price} = \frac{S_1 P_1 + S_2 P_2}{S_1 + S_2}

Real Numerical Example: Averaging Down: 100 shares @ $150 + 150 shares @ $110

Scenario Parameters:
Lot 1: 100 @ $150 ($15,000) | Lot 2: 150 @ $110 ($16,500) | Market: $135
Total Shares: 250. Total Cost: $31,500. Weighted Average Price: $126.00/share. Current Value at $135: $33,750 (+$2,250 profit / +7.14%).

By buying 150 shares at $110, you reduced your break-even price from $150 to $126, turning a losing trade into an active profit at $135.

How to Use This Stock Average Calculator

1

Enter the number of shares and price per share from your initial purchase.

2

Input the share count and price per share from your secondary purchase.

3

Enter the current stock market price to see your current profit or loss.

4

Review your new weighted average cost basis and break-even threshold.

Key Benefits & Use Cases

  • • Eliminates dangerous manual math errors when calculating cost basis.
  • • Calculates exact break-even prices after "averaging down" during stock dips.
  • • Essential for both long-term investors dollar-cost averaging and active stock traders.

Assumptions & Limitations

  • • Calculates volume-weighted average price (VWAP) across entered purchase lots.
  • • Does not include brokerage commission fees or regulatory transfer fees.
Frequently Asked Questions

Got Questions About Stock Average Calculator?

Averaging down is purchasing additional shares of a stock after its price has declined. This lowers your average cost basis, requiring a smaller price recovery to reach break-even or profitability.

For high-quality index funds or strong profitable businesses with solid fundamentals, averaging down is great. However, averaging down on failing companies with deteriorating business models can multiply your losses.

Cost basis is the original purchase price of an asset for tax purposes, used to determine capital gains or losses when you eventually sell.

Yes! The mathematical weighted average formula is identical whether you are averaging stocks, Bitcoin, gold, or mutual funds.

Most brokers default to FIFO (First In, First Out), but you can also elect Specific Identification, LIFO (Last In, First Out), or Average Cost for mutual funds.

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Financial Calculation Disclaimer: The outputs produced by the Stock Average Calculator are mathematical estimates based on user-supplied variables and standard financial formulas. This tool does not take into account individual tax obligations, jurisdictional regulations, or personal circumstances, and does not constitute formal financial advisory or underwriting approval. Always confirm final loan terms, investments, and tax impacts with licensed professionals.