Stock Average Calculator
Roll several purchases of the same stock into one number — your total shares, total cost, and the average price you paid per share.
How it works
When you buy the same stock more than once at different prices, your real cost isn't any single purchase — it's the blend. This tool adds up every buy: multiply shares by price for each one to get its cost, sum all the costs, then divide by the total shares to land on your average price.
Say you grab 10 shares at $50 and later 5 more at $60. That's $500 plus $300, or $800 for 15 shares — an average of about $53.33 each. Buy more when the price is low and your average drops; buy more when it's high and it creeps up.
That average is your break-even line. Once the stock trades above it you're in the green across the whole position, even if some individual buys are still underwater. Add a row for every purchase to keep the number honest as your holding grows.
Frequently asked questions
What does 'averaging down' mean?
It's buying more shares after the price has dropped, which pulls your average cost per share lower. If your first buy was at $60 and you add more at $40, your average lands somewhere between — closer to break-even if the stock recovers.
How is the average price calculated?
Not by averaging the prices themselves — by weighting them by how many shares you bought. The tool totals the cost of every purchase, then divides by your total share count, so bigger buys pull the average toward their price.
Does this account for fees or taxes?
No. It gives you the average purchase price based purely on shares and price. If you want your true cost basis, add any trading commissions to the amounts you enter — and remember taxes only come into play when you sell.