Your average cost across multiple stock purchases — with total invested, current value and gain or loss per lot and overall.
Average cost is your break-even price: above it the position is in profit, below it at a loss.
Average cost per share
—How to use this tool
Enter the shares and price paid for every lot you bought. Add or remove rows as needed.
The live price per share, used to value the whole position.
Total invested ÷ total shares — the price the stock must beat for you to break even.
The per-lot table shows which purchases are in profit and which are under water.
Formula & worked example
Buy 10 shares at $100 and 10 at $150: invested $2,500, average cost $125. At a current price of $140 the position is worth $2,800 — a $300 gain (12%).
Limitations — read this before you rely on it
This is an average-cost view for planning only: it ignores brokerage fees, taxes, dividends, splits and currency effects unless you fold them into your purchase prices.
Frequently asked questions
Your total invested divided by your total shares — the single price that summarises every purchase you made.
It is your break-even price: above it the position is in profit, below it the position is at a loss.
No — buying more at a lower price lowers your average, but it also increases your exposure to a falling stock.
Not automatically. If you paid commission, add it to the price of the relevant lot for a truer average.
No — it is arithmetic on your own figures. Investment decisions should consider your full financial situation.