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Average Down Calculator
Bought a stock more than once at different prices? Enter each purchase leg to calculate your new weighted average cost per share, total capital invested, break-even price, and how far underwater you are at the current price.
Enter to see your break-even % and how far you are underwater.
Enter your buy legs above
Fill in shares and price per share for at least two purchase legs to see your new weighted average cost per share.
How averaging down works — and when to be careful
The math: weighted average cost
When you buy a stock in multiple lots at different prices, your average cost per share is the weighted average — not the simple average. Weighted average = total dollars invested ÷ total shares held. If you buy 100 shares at $50 and 100 at $30, your average is $40, not $40 (same in this case). But if you bought 100 at $50 and 200 at $30, your average drops to $36.67.
The more shares you buy at the lower price, the more aggressively your average comes down — that's the mechanics this calculator shows instantly.
Break-even price and % to recover
Your break-even price after averaging down is exactly your new weighted average cost. To see how much the stock needs to rise from today's price to break even, enter the current market price in the optional field above.
Formula: break-even gain % = (new average cost − current price) ÷ current price × 100. A stock at $32 with a $40 average cost needs a 25% rally to break even — not 20%. Losses require bigger gains to recover than they look.
When averaging down makes sense
Averaging down works best when: (1) the business fundamentals are unchanged — the drop is sentiment-driven, not earnings-driven; (2) you have done fresh due diligence since your original purchase; and (3) you have the financial capacity to hold through further declines without being forced to sell.
Value investors like Warren Buffett have long used averaging down as a strategy — but only in businesses they understand deeply and where the long-term thesis remains intact.
The risk: catching a falling knife
“Catching a falling knife” describes averaging down into a stock that is falling because the business itself is deteriorating — not because the market is temporarily irrational. Revenue misses, guidance cuts, debt problems, or industry disruption are warning signs that averaging down may compound your losses rather than accelerate your recovery.
Always ask: has my original thesis changed? If the answer is “I don't know,” do the research before adding capital.
Frequently asked questions
What does averaging down mean in investing?
Averaging down means buying additional shares of a stock after its price has fallen below your original purchase price. By adding more shares at a lower price, your weighted average cost per share decreases — which is why it's called averaging down. The goal is to lower your break-even point so you need a smaller price recovery to get back to profitability. The risk is that you invest more capital in a stock that may continue to fall.
How do you calculate a new average cost after averaging down?
To calculate your new average cost per share after averaging down: multiply each lot's shares by its price per share, add all those amounts together to get total cost, then divide total cost by total shares. For example: you own 100 shares at $50 ($5,000) and buy 200 more at $35 ($7,000). Total cost = $12,000, total shares = 300, new average = $12,000 / 300 = $40/share. This is the weighted average cost basis.
What is a break-even price after averaging down?
Your break-even price after averaging down is simply your new weighted average cost per share. If the stock rises back to that level, you neither gain nor lose money. To calculate the percentage gain needed from today's price: (new average cost − current price) / current price × 100. If your new average is $40 and the stock trades at $32, you need a 25% gain to break even.
Is averaging down a good strategy?
Averaging down can work well if the underlying business is sound and you are buying additional shares for fundamental reasons — not just to lower your break-even. It becomes dangerous when investors 'catch a falling knife': continuing to average down in a stock that is falling due to deteriorating fundamentals rather than temporary market weakness. Before averaging down, ask: has anything changed about the business? Is this a temporary drawdown or a structural problem? Do I have enough cash to continue averaging down if it falls further?
What is the difference between averaging down and dollar cost averaging (DCA)?
Averaging down is a reactive strategy — you buy more after a price drop to lower your cost basis on a specific position you already hold. Dollar cost averaging (DCA) is a proactive, systematic strategy — you invest a fixed dollar amount at regular intervals regardless of price. Both lower your average cost in a falling market, but DCA removes the emotional decision of when to buy and applies across your full portfolio or index fund, not just one stock.