Calculators › Trading
Target Break-Even Calculator
The target break-even calculator answers a blunt question: how many more shares it takes to drag your break-even down to a price you choose, and how much bigger your position gets to reach it. Browser-only, nothing stored.
To move your break-even to a chosen price by averaging down, the extra shares needed equal current shares x (current average - target) / (target - new buy price); it shows how much more you must buy, and how much larger the position becomes, to reach that break-even level.
Where you are now
To move break-even to your target
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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.
Frequently asked questions
How many shares do I need to buy to lower my break-even to a target?
held × (avg − target) / (target − price). The closer your target is to the current price, the fewer shares it takes; the closer it is to your old average, the more it takes.