Calculate average stock cost after multiple buys — see average price, total shares, total cost and break-even price.
Calculate average stock cost after multiple buys — see average price, total shares, total cost and break-even price.
Enter values above and click Calculate — results will appear here with the formula explained.
Averaging down lowers the average cost per share when you buy more shares at a price below your original purchase, but it also increases total exposure to that single position. Total cost is the sum of each lot's shares times price plus commissions, and the new average is total cost divided by total shares — the break-even price before commission. For example, 100 shares at $50 ($5,000) plus 100 at $30 ($3,000) totals $8,000 across 200 shares for a $40 average.
Lowering the average feels like improvement but concentrates risk; accounting health requires position sizing and conviction, not merely arithmetic. The calculator shows both total outlay and new average so you can judge break-even distance and opportunity cost against alternative uses of the add-on capital.
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Averaging down lowers the average cost per share when you buy more shares at a price below your original purchase, but it also increases total exposure to that single position. Total cost is the sum of each lot's shares times price plus commissions, and the new average is total cost divided by total shares — the break-even price before commission. For example, 100 shares at $50 ($5,000) plus 100 at $30 ($3,000) totals $8,000 across 200 shares for a $40 average. Formula: Average = totalCost / totalShares where totalCost = sum(shares*price)
Stock Average Calculator computes calculate average stock cost after multiple buys — see average price, total shares, total cost and break-even price. Formula: Average = totalCost / totalShares where totalCost = sum(shares*price). Example: Buy 100 at $50 ($5k) + 50 at $40.
Calculate average stock cost after multiple buys — see average price, total shares, total cost and break-even price. Formula: Average = totalCost / totalShares where totalCost = sum(shares*price)
| Field | What to enter |
|---|---|
| Buy 1: shares | e.g. 100 |
| Buy 1: price ($) | e.g. 50 |
| Buy 2: shares | e.g. 50 |
| Buy 2: price ($) | e.g. 40 |
| Buy 3: shares (optional) | e.g. 0 |
| Buy 3: price (optional) ($) | e.g. 45 |
All fields use the exact formulas shown below — results include step-by-step breakdowns you can verify by hand.
Averaging down lowers the average cost per share when you buy more shares at a price below your original purchase, but it also increases total exposure to that single position. Total cost is the sum of each lot's shares times price plus commissions, and the new average is total cost divided by total shares — the break-even price before commission. For example, 100 shares at $50 ($5,000) plus 100 at $30 ($3,000) totals $8,000 across 200 shares for a $40 average.
Lowering the average feels like improvement but concentrates risk; accounting health requires position sizing and conviction, not merely arithmetic. The calculator shows both total outlay and new average so you can judge break-even distance and opportunity cost against alternative uses of the add-on capital.
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Buy 100 at $50 ($5k) + 50 at $40 ($2k) = 150 shares, $7k total, average $46.67. Third buy 50 at $45 adds $2,250, new average $46.25 for 200 shares.
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