Average Down Calculator
Calculate how many additional shares are required to reach a target average stock cost.
Enter your values
Understand this calculation
This calculator solves for the number of additional shares needed to move an existing position toward a user-selected target average cost.
Formula
Worked example
If you own 10 shares at $100, a new purchase price of $70 would require 5 additional shares to reach a $90 target average.
How to interpret the result
The result is a mathematical quantity required to reach the target cost. It is not a recommendation to buy more shares.
Assumptions & limitations
The formula only works when the new purchase price is below the target average and the target average is below the current average. Fees and taxes are excluded.
Practical context
When this calculator is useful
Use this calculator when you want to quantify how many additional shares would be required to move an existing average cost toward a specific lower target. It turns an averaging-down idea into an explicit capital requirement.
How investors commonly use it
Investors may use the result as a scenario check before committing more capital, particularly to see how quickly the required share count grows as the target average approaches the new purchase price.
What this metric does not tell you
The calculator does not evaluate whether averaging down is justified. A lower average cost can increase exposure to a deteriorating business, and the target itself is chosen by the user rather than derived from fundamental value.