1
Enter your first purchase
Add the number of shares, price per share, and any transaction fee paid for your first stock purchase.
Investment Planning Tool
Stock Average Calculator
Calculate the weighted average purchase price of your shares after buying the same stock at different prices.
Calculate Your Average Stock Price
Add each stock purchase separately for an accurate result.
Enter the number of shares and the price paid per share.
Brokerage fees are optional and should be entered separately
when you want them included in your total cost.
| # | Number of Shares | Price per Share | Fees | Purchase Cost | Remove |
|---|
Average Price per Share
$0.00
Your weighted average cost
Total Shares
0
Combined share quantity
Total Investment
$0.00
Including entered fees
Break-Even Price
$0.00
Price needed to recover cost
What Is a Stock Average Calculator?
A stock average calculator finds the weighted average price paid when you purchase the same stock more than once.
Understanding your average stock price
A stock investor may buy 10 shares at one price and purchase another 20 shares later at a different price. A simple average of the two prices would not be accurate because the number of shares purchased at each price is different.
This calculator multiplies every purchase price by its share quantity. It then divides the combined investment by the total number of shares to determine your weighted average cost.
Why the average purchase price matters
Your average price helps you estimate your break-even point, calculate unrealized profit or loss, and understand how an additional purchase may change your total position.
Stock Average Formula
The calculator uses the weighted-average cost formula:
Average Price = Total Purchase Cost ÷ Total SharesEach purchase cost is calculated as:
Purchase Cost = Shares × Price per Share + FeesIncluding fees provides a more realistic break-even price.
How to Use the Stock Average Calculator
Follow these three steps to calculate your average share price.
2
Add additional purchases
Select “Add Another Purchase” and enter each additional stock purchase on a separate row.
3
Review your results
The calculator displays your total shares, total investment, average cost, and estimated break-even price.
Stock Average Calculation Example
Suppose an investor makes the following purchases:
First purchase: 10 shares at $100 per share, creating a total cost of $1,000.
Second purchase: 20 shares at $80 per share, creating a total cost of $1,600.
The investor owns 30 shares with a combined investment of $2,600. Dividing $2,600 by 30 gives an average stock price of $86.67 per share.
The stock must therefore return to approximately $86.67 per share for the investor to break even, excluding selling fees and taxes.
Frequently Asked Questions
Common questions about average stock prices and investment costs.
Multiply the price of each purchase by the number of shares, add all purchase costs together, and divide the result by the total number of shares owned.
Buying additional shares below your current average price reduces the average cost. Buying above your current average increases it.
Yes. Including brokerage and transaction fees gives a more accurate total investment and break-even price.
The break-even price is the approximate share price at which your position equals your total purchase cost. Selling fees and taxes may increase your actual break-even point.
Yes. This calculator lets you add multiple purchases and combines them automatically into one weighted-average price.
No. It provides mathematical estimates based on the values entered and does not determine whether a stock should be bought or sold.
Important: This calculator is for informational
purposes only. It does not include taxes, currency conversion,
dividends, or future selling fees unless you account for them
manually.