Stock Average Down Calculator
When a stock you own drops in price, buying additional shares lowers your average cost per share. This calculator shows your new blended cost basis, total shares owned, and total amount invested after averaging down.
How it works
Averaging down means buying more shares of a stock you already own at a lower price, which reduces your overall average cost per share.
The formula is a weighted average: New Average = (Existing Shares × Existing Price + New Shares × New Price) ÷ (Existing Shares + New Shares). The result is your blended cost basis and the price the stock must reach for you to break even.
Tips
Only average down on stocks you believe in for the long term — buying more of a declining company can amplify losses if it keeps falling.
Your break-even price equals your new average cost. Lowering it makes it easier to recover, but never invest more than you can afford to lose.
FAQ
What does averaging down mean?
Averaging down is buying additional shares of a stock you own at a lower price than your original purchase, which lowers your average cost per share and break-even point.
Does averaging down guarantee profit?
No. It only lowers your average cost. If the stock continues to fall, you lose money on a larger position. It works only if the price eventually recovers above your new average.
How is the new average price calculated?
It is a weighted average of all shares: total dollars invested divided by total shares owned. Each purchase is weighted by the number of shares bought at that price.