Break-even win rate = 1 ÷ (1 + R). Expectancy per trade (in R) = win% × R − loss% × 1. Both ignore spreads and commissions, which lower real results.
About this calculator. The result is an educational estimate. Contract sizes, pip values, spreads, commissions and overnight financing differ by broker and by instrument, and fills can differ from the prices you model. Check your own account's specification before trading.