Stock Average Price
Calculate average purchase price and shares for averaging down
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About this tool
Enter each purchase as a quantity and a price to get the weighted average cost across all your buys. This is not a simple average โ purchases with a larger quantity pull the average price toward them more. Add a current price to see your position value, profit or loss, and return rate. Add a target average price to work out how many more shares to buy at the current price to bring your average down to that target.
How to use
- Enter each purchase as a quantity and a price, one row at a time (add more rows if you bought in several batches).
- Check the weighted average price and total cost at the top.
- Enter the current price to see your position value, profit or loss, and return rate.
- Enter a target average price to find out how many more shares to buy at the current price to reach it.
- If no result appears, check the FAQ below for why.
Frequently asked questions
- Why doesn't it show a result when I enter a target average price?
- If the current price is higher than your target average price, no amount of buying gets you there โ the more you buy, the average price stays above the target instead of falling to it.
- What if my average price is already below the target?
- Then there's nothing to calculate. You don't need to buy more, since your average price is already lower than the target you entered.
- Are fees and taxes included?
- No. This calculator only uses the quantities and prices you enter. Your actual results will depend on brokerage fees, taxes, and the exact fill price.
- How is this different from a simple average?
- A simple average treats every price equally. This weighted average lets purchases with a larger quantity pull the average price toward them more strongly.
- Can I enter sales, not just purchases?
- No, this calculator only handles buys. If you sold and bought back in, treat the buys after your last sale as a fresh set of purchases.
This is a simple arithmetic tool, not investment advice. Fees, taxes, and slippage are not included, and all investment decisions and their outcomes are your own responsibility.