Stock Average Calculator
Enter each of your purchases to see your average cost per share — and what averaging down would do to your cost basis.
Total shares
0
Total invested
$0.00
Average price per share
$0.00
Averaging down? Check the stock first.
A lower price only helps if the business is still healthy. Run a free 10-point fundamental analysis before you buy more.
Analyze the stock for freeHow the stock average calculator works
Your average price per share (also called cost basis per share) is a weighted average of everything you paid: total invested ÷ total shares. Say you bought 10 shares at $100 and later 10 more at $60 — you invested $1,600 for 20 shares, so your average is $80, not the simple midpoint of the two prices. The calculator does this math for any number of purchases, which makes it easy to answer the real question: what happens to my average if I buy more at today's price?
Add a row with the planned purchase to preview your new average before placing the order. The lower your average, the smaller the recovery the stock needs for you to break even — but remember that averaging down also increases the amount of money at risk in a single position.
Frequently asked questions
How is the average stock price calculated?+
The average price per share is the total amount invested divided by the total number of shares: multiply the shares of each purchase by its price, add everything up, and divide by the sum of all shares. This weighted average is your cost basis per share.
What does averaging down mean?+
Averaging down means buying more shares of a stock you already own after the price has fallen. The new purchases lower your average cost per share, so the stock needs to recover less for your position to break even. It only pays off if the company is still fundamentally sound.
When is averaging down a bad idea?+
Averaging down into a company with deteriorating fundamentals — falling revenue, shrinking margins, rising debt — just concentrates money in a losing position. Before buying more, check the fundamentals: a quick 10-point analysis shows whether the business behind the falling price is still healthy.
For educational purposes only. Not financial advice. All investments carry risk of loss.