Rule of 4 — Flop
On the flop (two cards to come), multiply your outs by 4 for approximate equity.
9 outs × 4 = 36%
Rule of 2 — Turn
On the turn (one card to come), multiply your outs by 2 for approximate equity.
9 outs × 2 = 18%
OutsDrawExampleFlopTurn
1Single clean out
4%
2%
2Pocket pair to set
8%
4%
4Gutshot
16%
9%
6Two overcards
24%
13%
8Open-ended straight
31%
17%
9Flush draw
35%
20%
12Flush + gutshot
45%
26%
15Flush + open-ended
54%
33%
Flop equity uses the Rule of 4 (outs × 4), turn equity uses the Rule of 2 (outs × 2). These are approximations — exact values are slightly lower for high out counts. Equity assumes you will see all remaining cards without additional betting.