Gutshot straight draw odds
Outs
With 4 outs, a gutshot straight draw hits on the turn 8.5% of the time and by the river 16.5% of the time when you see both cards.
- 8.7%hit on the river, from the turn
- 5.1 to 1odds against, both cards to come
- 10.8 to 1odds against, next card only
- 16%the rule of 4 estimate
- 25%equity needed to call a half-pot bet
Understanding Gutshot Probabilities
A gutshot straight draw requires exactly one specific card to complete your hand. This limited number of outs creates distinct probabilities depending on how many cards remain to be dealt. The table below breaks down these chances clearly. It shows that seeing both the turn and river offers a better chance of hitting than seeing only the next card. When only one card remains, the odds against hitting are steep. When two cards remain, the cumulative chance improves significantly. These figures assume no other players fold or change the deck composition. The difference between seeing one card versus two is substantial. You must weigh the immediate cost against the potential reward based on these specific conditions.
| Cards to come | Chance to hit | Odds against |
|---|---|---|
| Turn, one card | 8.5% | 10.8 to 1 |
| River, one card | 8.7% | 10.5 to 1 |
| Turn or river, both cards | 16.5% | 5.1 to 1 |
The Rule of Two and Four
Quick estimation methods simplify mental math during play. The rule of two applies when only one card remains to be dealt. Multiply your outs by two for a rough percentage chance. The rule of four applies when two cards remain, such as in an all-in situation before the flop. Multiply your outs by four for the estimated chance. For a gutshot, this yields a quick estimate close to the exact figure for both cards. However, the exact calculation is slightly higher. The rule provides a fast baseline, but precise odds matter when comparing against specific bet sizes. Use the rule for speed and exact figures for precision when the stakes are high.
Comparing Odds Against Bet Sizes
Equity requirements depend solely on the bet size relative to the pot. A half-pot bet requires your hand to have sufficient equity to justify the call. The table above shows the exact chances for hitting. Compare these chances to the equity needed for common bets. If the required equity exceeds your chance to hit, the call is mathematically unfavorable without implied odds. The chance to hit increases when two cards remain compared to one card. This increase may shift the decision from unfavorable to favorable. Always match the specific probability of your situation against the specific price you must pay. Do not assume a draw is profitable just because it is common. If gambling stops being fun, free help is available via support resources.
Questions
Why does the chance increase with two cards?
Seeing two cards provides two independent opportunities to hit your out. The cumulative probability of hitting at least once is higher than hitting on a single specific card. This applies when betting stops after the flop.
Is the rule of four accurate?
The rule of four provides a close approximation for two-card scenarios. It is slightly lower than the exact mathematical probability. Use it for quick decisions, but rely on exact figures for precise equity calculations.
How do outs affect gutshot odds?
A gutshot has four outs. This fixed number determines the probability. More outs increase the chance to hit. Fewer outs decrease it. The calculation depends only on the number of outs and cards remaining.
Where can I find help for gambling issues?
If gambling stops being fun, free help is available. Visit the help section for support resources. These resources assist with managing time and money effectively.
Every figure on this page is computed by code from a standard 52-card deck, counting every possible card and checking the count a second way. See the methodology.