Averaging down means buying more shares of a stock after its price drops, lowering your average cost per share. This strategy reduces the gain needed to break even, but concentrates risk in a single position. Use this calculator to see your new average cost, total investment, and break-even price before you buy.
Your Positions
Position Breakdown
| Purchase | Shares | Price | Cost | % of Total |
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How to Use the Stock Average Down Calculator
When a stock you own drops in price, buying more shares lowers your average cost per share. This calculator helps you determine exactly how much your average changes with each new purchase, so you can make informed decisions about adding to a losing position.
Step 1: Enter Your Original Purchase
In the first row, enter the number of shares from your original purchase and the price you paid per share. For example, if you bought 100 shares at $50, enter those values.
Step 2: Add Your New Purchase(s)
In the second row (or add more rows using the "+ Add Purchase" button), enter the shares and price for each subsequent purchase. You can track up to as many buys as you want — the calculator handles any number of positions.
Step 3: Calculate and Review Results
Click "Calculate Average Cost" to see your new weighted average cost per share, total shares held, total amount invested, and break-even price. The position breakdown table shows the contribution of each purchase to your overall cost basis.
Understanding the Break-Even Price
The break-even price equals your average cost per share. If you bought 100 shares at $50 and then 100 more at $30, your average cost is $40 — the stock needs to reach $40 for you to break even. By averaging down, you reduced the required gain from 0% (at $50) to needing a recovery from $30 to $40, a 33% gain rather than a 67% gain back to $50.
When Averaging Down Makes Sense
Averaging down is a sound strategy when the underlying company's fundamentals are unchanged and you believe the price drop is temporary market sentiment, not a reflection of a deteriorating business. Index funds, ETFs, and blue-chip stocks are generally safer candidates for averaging down than speculative growth stocks where the business model may be genuinely at risk.
Frequently Asked Questions
Is this stock average down calculator free?
Yes, completely free with no signup required. All calculations run in your browser — your investment data is never sent anywhere.
Is my data private?
Absolutely. Everything runs client-side in your browser. No data is transmitted or stored on any server.
What does averaging down mean in stocks?
Averaging down means buying additional shares of a stock after its price has dropped below your original purchase price. This lowers your average cost per share, meaning the stock needs to rise less to break even. For example, if you bought 100 shares at $50 and buy 100 more at $30, your new average cost is $40 per share instead of $50.
How is the new average cost calculated?
The formula is: New Average Cost = (Original Shares × Original Price + New Shares × New Price) / Total Shares. This weighted average accounts for different quantities at each price point. Our calculator shows you the total invested, total shares, and new average cost instantly.
What is the break-even price after averaging down?
The break-even price is your new average cost per share — the price the stock must reach for you to have zero gain or loss. By averaging down, you reduce this break-even price, requiring a smaller percentage gain to return to profitability compared to your original position.
Should I always average down on losing stocks?
Not necessarily. Averaging down makes sense if you believe the company's fundamentals are still strong and the price drop is temporary. It is risky if the company has fundamental problems — averaging down on a failing company (called 'catching a falling knife') can amplify losses. Always evaluate why a stock dropped before adding to the position.