Position size calculator.

The stop defines the trade. Size comes from it. Enter your account, your risk and your stop, and this works out the size, the targets in R, and how often each target gets hit by chance alone.

For education only, not a recommendation to trade. The chance line assumes a market with no edge and ignores costs; your own results depend on your rules, costs and execution. Contract values are the exchange's standard multipliers; check your broker's.