Count your outs and calculate the probability of completing your hand on the turn, river, or both.
Select Your Draw Types
Select all draws that apply. If outs overlap (e.g. flush draw + straight draw sharing a card), reduce total by shared outs using the adjustment field.
If you have a flush draw + straight draw, some cards may complete both draws. Subtract those overlapping outs here. For a typical combo draw (flush + OESD), subtract 2.
Outs & Probabilities
Total Outs-
Probability of Hitting
On the Turn (1 card)-
On the River (1 card)-
Turn + River (2 cards)-
Approximate (Rule of 2 & 4)
Rule of 2 (one card)-
Rule of 4 (two cards)-
References: Outs-based probability. P(hit on turn) = outs/47. P(hit turn+river) = 1 - C(47-outs,2)/C(47,2). Rule of 2 and 4 approximation by Phil Gordon.