Target Break-Even Calculator

How it works

What this calculator does

You hold a losing position and want your break-even to sit at a specific target price. This tool solves for how many additional shares you must buy at the current price to pull the blended average down to that target — and shows how much larger your position becomes.

The formula

To move a holding of held shares at average cost avg down to a target by buying at the current price:

shares to add = held × (avg − target) / (target − price)

The target must sit between the current price and your current average for a solution to exist.

Worked example

You own 100 shares at an average of $50. The price is now $30 and you want break-even at $40. Then 100 × (50 − 40) / (40 − 30) = 100 × 10 / 10 = 100 extra shares. After buying, you hold 200 shares averaging $40 — but your dollar exposure has doubled, which the tool flags as an exposure multiplier.

What it deliberately does not do

This is the honest math of buying down to break-even. It shows the cost, not a recommendation. A larger position means a larger loss if the price keeps falling, and the tool offers only the arithmetic — no live prices, no investment advice.