Stock Average Calculator
Bought the same stock at different prices? Our free Stock Average Calculator combines all your purchases into one average cost per share, showing your total investment, total shares, and current profit or loss.
Stock average price
Average your share cost across multiple purchases - total cost divided by total shares.
FAQs
How do I calculate my average share price?
Add up the total cost of every purchase (shares x price for each buy), add up the total number of shares, then divide total cost by total shares. If you paid brokerage fees, include them in the cost for a true average.
Is averaging down always a good idea?
No. Averaging down lowers your breakeven price, but it also concentrates more money in a stock that is falling - which can be throwing good money after bad if the company's fundamentals have deteriorated. Only average down when your original investment thesis still holds.
How it works
When you buy shares of the same stock at different times and prices, your broker shows each purchase separately - but what matters for decisions is your average cost per share: total money invested divided by total shares owned. This calculator does that math instantly across any number of purchases.
For example, say you buy 100 shares at $50 ($5,000), then 100 more at $40 ($4,000) when the price dips, then 50 at $60 ($3,000). Your total cost is $12,000 for 250 shares, so your average cost is $48 per share. If the stock now trades at $55, you're up $7 per share, or $1,750 overall.
Investors use this most often when "averaging down" - buying more after a price drop to lower their average cost. The calculator shows exactly how many shares at what price you'd need to bring your average down to a target level.
Note that averaging down increases your exposure to the stock, so it should be a deliberate decision based on the company's prospects, not just a reflex to a falling price. The math tells you the new average; only your research tells you whether buying more is wise.
Averaging Down: How the Math Works
Averaging down means buying more shares at a lower price than your earlier purchases, which pulls your average cost per share down. If you own 100 shares at $50 and buy 100 more at $30, your average drops from $50 to $40 - so the stock only needs to recover to $40 for you to break even instead of $50.
The catch is position size: you've now doubled your money in a declining stock. The calculator shows you the new average instantly, but pair that number with an honest question - would you buy this stock fresh today at the current price? If not, averaging down may be hope disguised as strategy.
Averaging Up Is Underrated
Less discussed but often smarter: averaging up, or buying more of a stock that has risen. If your research was right and the price climbed from $50 to $70, adding shares raises your average cost - but it also increases your stake in a proven winner.
Many successful investors build positions gradually as a thesis plays out rather than going all-in on day one. The average cost calculator works the same way here: it tells you your new blended cost so you can judge the position's overall performance accurately.
Tracking Average Cost for Tax and Planning
Beyond strategy, average cost matters for record-keeping. When you eventually sell, your profit or loss is measured against what you paid - and with multiple purchases at different prices, the blended average is the baseline most investors track for planning.
Keep a simple log of every buy: date, shares, price, and fees. A calculator gives you the average in seconds, but the log is what lets you reconstruct your history months later when it's time to review performance or prepare records.