Calculate your new average stock price after buying additional shares. See total cost, shares, break-even price, and averaging-down scenarios instantly.
You might also find these calculators useful
When you buy additional shares of a stock you already own, your average cost per share changes. The stock average calculator computes your new cost basis instantly: multiply each lot's share count by its price, sum the totals, then divide by total shares. Use this tool to plan averaging-down strategies, set stop-loss levels, and decide how many shares to buy to reach a target average price.
Your average stock price (also called average cost basis or cost per share) is the weighted average of all the prices you paid for a stock across multiple purchases. It determines your break-even point and the profit or loss you realize when you sell. Averaging down means buying more shares at a lower price to reduce your average cost; averaging up means buying at a higher price, which raises your cost basis.
Formula
Know exactly what you paid per share across all purchases so you can make informed sell decisions and accurately report capital gains.
See exactly how many shares to buy and at what price to bring your average cost to a target level before entering a position.
Instantly see the minimum price at which you can sell all shares and break even, accounting for any transaction fees.
Enter today's market price to get a real-time estimate of your unrealized profit or loss across the entire position.
The scenario table shows how your average price changes if you buy 25%, 50%, 100%, 150%, or 200% of the planned quantity.
You bought 100 shares at $150 and the price fell to $100. Use the calculator to find how many shares to buy at $100 to bring your average below $120.
You own shares at $80 and the stock is rising. Calculate your new average cost if you buy more at $120 to understand your new break-even level.
Track the weighted average cost of multiple purchases to prepare accurate tax reporting for capital gains and losses.
Evaluate how regular, fixed-dollar purchases at different prices affect your overall average cost over time.
The average price of a stock (also called cost basis per share) is the weighted average of all prices paid across multiple purchases. It equals total amount invested divided by total shares owned.
To average down, buy additional shares at a price below your current average cost. This reduces your break-even point. Use the calculator's reverse solver to find the exact shares needed to reach a specific target average.
No. Averaging down lowers your break-even price and reduces the recovery needed to profit, but if the stock continues to fall you will lose more money. Always evaluate the fundamental reasons behind the price decline.
Flat fees or percentage-based commissions add to your total cost basis. This calculator includes fees in the average price calculation so your break-even reflects the true amount you need to recoup.
Yes. Averaging up — buying more shares at a higher price — raises your average cost but is common in momentum strategies where strong stocks are expected to continue rising.
The break-even price equals your total invested amount (including fees) divided by total shares. At this price, selling all shares recovers exactly what you spent.