Formula
The formula is displayed so the result can be checked independently. PreBreakout does not use a hidden scoring model on this page.
Worked hypothetical example
With a hypothetical account value of 10,000, a chosen 1% risk budget, entry 50 and stop 48, the risk budget is 100 and the raw size is 50 units.
Important: the numbers are fictional and are not associated with a security, issuer or current market price.
What this calculator does not tell you
- The calculator does not suggest a risk percentage; you choose the percentage to model.
- It ignores slippage, taxes, financing, partial fills and broker-specific constraints.
- Unit count is rounded down to a whole unit.
Market execution can differ from arithmetic inputs because of spreads, gaps, slippage, order types, broker constraints and other factors. This tool does not attempt to model those effects unless an input explicitly asks for a value.
How to use it for learning
Change one input at a time and observe how the result changes. This is especially useful for understanding sensitivity: wider stop distance changes position-size arithmetic, a taller pattern changes a measured-move result, and a larger reward-to-risk ratio changes the theoretical break-even win rate. The exercise is about the formula, not about identifying a trade.