1, The relationship between the probability of loss and profit. This ratio is often used as a basis for trade selection or comparison.
2, A calculation equal to the potential reward divided by the potential risk of a position. A long position entered at 100 with potential reward estimated at 120 and potential risk of 90 would have a reward-to-risk ratio of 20:10, or 2 to 1. Generally, a higher reward-to-risk ratio is a more appealing trade. For a long position, potential reward might be based on breakout projections, resistance levels or retracement estimates. Potential risk might be based on support levels, stop or loss requirements.