Definition
Risking $100 to make $200 is a 1:2 ratio. Many traders require at least 1:2, but the right ratio depends on how often the setup wins: a lower win rate needs a larger payoff.
Formula
Risk/reward = (target - entry) / (entry - stop)
Watch out for
A good ratio on paper means little if the target is unrealistic or the stop is too tight.
Example
Hypothetical exampleEntry at $50, stop at $48 and target at $56 risks $2 to make $6, a 1:3 ratio.