Stock Average Calculator
When you buy a stock at different prices, your cost basis is the weighted average of those purchases. Enter the shares and price for each lot.
Enter your figures below. Results update as you type.
Average cost per share$39.56
- Total shares
- 80
- Total cost
- $3,165.00
How the Stock Average calculation works
Average cost = total amount paid / total shares bought
Buying more shares below your current average lowers it, a practice known as averaging down. It reduces the break-even price but increases exposure to that stock.
Frequently asked questions
How do I calculate my average stock price?
Divide the total amount you paid by the total number of shares. Buying 100 shares at $50 and 50 more at $40 costs $7,000 for 150 shares, an average of $46.67.
What is averaging down?
Buying more of a stock after its price has fallen, which lowers your average cost per share and so the price at which you break even. It also increases the amount you have at risk in one company.
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