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Stock Average Calculator

Average price + reverse average-down (shares needed for a target)

For information only — not investment advice. Fees and taxes are not included.
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FAQ
How is the average price calculated?
Total cost of all purchases divided by total shares. Example: 10 shares at $50 and 10 at $40 gives (500+400)/20 = $45.
How does the average-down formula work?
Shares to buy = holdings × (current average − target) ÷ (target − buy price). The target must sit between the buy price and your current average; results are rounded up to whole shares.
Are fees and taxes included?
No — the math uses raw prices. Broker fees are usually small, but add them for a conservative break-even.
Is averaging down always a good idea?
It lowers your break-even but increases exposure to a falling stock. This tool does the math; the investment decision should rest on the stock itself.
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Average price and averaging down

Your average price is total cost divided by total shares. Enter each purchase and the calculator does the rest.

The average-down formula

Shares to buy = holdings × (current avg − target) ÷ (target − buy price). Holding 100 shares at $50 with the stock at $40, reaching a $45 average requires 100 more shares — the tool also shows the cash required.

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