Stock Average Price Calculator
A stock average price calculator. Add your extra purchase to your current shares and average price to instantly get your new average price. See what your cost basis becomes after averaging down, and enter the current price to check unrealized P/L and return.
A stock average price calculator for after you buy more
The stock average price calculator instantly shows how your average cost changes when you buy more of a stock you already own. Also known as an averaging-down calculator, it lets you check where your cost basis lands if you add shares at a lower price.
Enter your current shares and average price plus the shares and price you plan to add, and it returns your new average price, total shares, and total cost at once.
Add the current price for unrealized P/L
Enter the current price too, and it shows your market value, unrealized profit or loss, and return (%). You can see exactly how averaging down changes your position.
The average is (old shares × old avg + new shares × new price) ÷ total shares. The calculator handles that math for you — just type the numbers.
How to use it
Great for simulating 'if I add X shares at this price, what's my new average?' before you buy. Switch currency between won, dollars, yen, and more for domestic or overseas stocks.
Results are estimates. Trading fees, taxes, and FX are not included, so real fills may differ.