Stock Average Calculator

Your average price is what determines your actual break-even point and profit/loss on a position, especially when you've bought the same stock at different prices over multiple purchases — the average is rarely the same as a simple midpoint of the two prices.

It weights each purchase price by the number of units bought at that price: (price1 × qty1 + price2 × qty2) divided by the total quantity — a larger lot at one price pulls the average closer to that price.

This calculator handles two buy lots at a time. For more purchases, you can average your existing combined position with each additional purchase in turn, treating your prior average as one of the two inputs.

Your weighted average purchase price, total units held across both lots, and the total amount invested.

No — this calculates the average of the raw purchase prices and quantities only. Use the Brokerage Calculator to separately estimate transaction costs.