Stock Average Price (DCA) Calculator
Calculate your weighted average cost per share when buying multiple lots of stock at different share prices (averaging down or averaging up).
What this calculator does
The Stock Average Price (DCA) Calculator estimates your result instantly from the values you enter, using standard investing & wealth formulas. Calculate your weighted average cost per share when buying multiple lots of stock at different share prices (averaging down or averaging up). Calculations run in your browser, so nothing you type is sent to a server, and the output is an estimate for planning rather than financial advice.
About Stock Average Price (DCA) Calculator
The Stock Average Price Calculator calculates your weighted average cost basis per share across multiple stock purchase transactions at varying price levels.
Formula & Mathematical Calculation
Weighted Average Price per Share = Total Capital Spent / Total Number of Shares Purchased
Average Price = Sum ( Shares_i × Price_i ) / Sum ( Shares_i )
Calculation Example
Lot 1: 50 shares @ $100 ($5,000). Lot 2: 100 shares @ $70 ($7,000). Total Spent = $12,000 on 150 Shares → New Average Cost Basis = $80.00/share (Averaged down from $100 to $80!).
Key Benefits
- Calculates exact weighted average price per share across up to 8 buys
- Computes additional shares needed to lower average price to a target target
- Shows total capital invested and share count
- Essential for Dollar-Cost Averaging and swing trading strategies
- Instant and private calculation
How to Use this Calculator
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Enter Share Quantity and Price for Each Buy
Input shares purchased and execution price per lot. -
Add Subsequent Purchases
Add additional buy orders. -
Calculate Average Cost
Click Calculate to view weighted average cost basis.
Assumptions & Limitations
What the calculation assumes
- Every value you enter is treated as an exact, known amount.
- Rates and contributions are assumed to stay constant for the whole period unless the form asks for them separately.
- Results use standard financial formulas and ignore fees, penalties and promotional terms that are not entered above.
- Inflation, tax changes and market volatility are not modelled unless a field for them is provided.
- Amounts are unit-agnostic: results are returned in the same currency you enter.
What it does not cover
- Stock Average Price (DCA) Calculator produces estimates for education and planning, not a quote, offer or professional advice.
- Real-world outcomes differ when fees, taxes, rounding rules or provider-specific terms apply.
- Local regulations and tax rules vary by country and change over time; verify current rules for your jurisdiction.
- Figures are only as accurate as the inputs you supply — check them before acting on the result.
- For decisions with lasting financial impact, confirm the numbers with a qualified professional.
Frequently Asked Questions
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