Poker Outs Calculator
Convert outs to equity using the Rule of 2 and 4, or exact combinatorics
Formula:Equity ≈ Outs × 2 (one street) or Outs × 4 (two streets)
Poker Outs Calculator
Convert outs to win probability
Cards that complete your draw (0-20)
Common Draws (click to use):
%
Enter to see if your draw is profitable
Equity Results
Your draw strength
Your Equity
35.0%
Need 1.9:1 pot odds or better
Rule of 4 estimate: 35.0%
Equity35.0%
Exact Equity
35.0%
Rule of 4
35.0%
Outs
9
Pot Odds Needed
1.9:1
Calculation difference: The Rule of 4 gives 35.0%, while exact combinatorics gives 35.0%. Difference: 0.0%. Approximation is accurate enough for most decisions.
Common Draw Reference
Quick reference for typical draws
| Draw Type | Outs | Turn Only | Turn+River |
|---|---|---|---|
| Flush Draw | 9 | 18% | 35% |
| Open-Ended Straight Draw | 8 | 16% | 32% |
| Gutshot Straight Draw | 4 | 8% | 16% |
| Two Overcards | 6 | 12% | 24% |
| Flush + Gutshot | 12 | 24% | 44% |
| Flush + Open-Ender | 15 | 30% | 53% |
| Set to Full House/Quads | 7 | 14% | 28% |
| One Pair to Two Pair/Trips | 5 | 10% | 20% |
| Pocket Pair to Set | 2 | 4% | 8% |
Try These Examples
Common poker draw scenarios
How to Count Outs
Step by step guide
Example: Flush Draw on the Flop
- 1. Your hand: A♠ 7♠
- 2. Board: K♠ 9♠ 3♥
- 3. Count spades: You have 4 spades (2 in hand + 2 on board)
- 4. Remaining spades: 13 - 4 = 9 outs
- 5. Turn + River equity: 9 × 4 = ~36%
- 6. Exact: 1 - (38/47 × 37/46) = 35%
Rule of 2
Multiply outs × 2 for equity to next card only (e.g., flop to turn). Quick estimate for single-street decisions.
Rule of 4
Multiply outs × 4 for equity over two cards (turn + river). Use on the flop when you expect to see both cards.
Quick Answer
TL;DR summary
Poker outs are cards remaining in the deck that complete your drawing hand. Count your outs, then use the Rule of 2 and 4: multiply outs by 2 for turn-only equity, or by 4 for turn+river equity. Example: A flush draw has 9 outs × 4 = ~36% equity to hit by the river. Adjust for blockers and reverse implied odds when opponents may hold your outs.
Key Facts About Poker Outs
Important things to know
- Outs = cards that complete your drawing hand
- Rule of 2: outs × 2 = equity for one street (~2% per out)
- Rule of 4: outs × 4 = equity for two streets (~4% per out)
- Flush draw: 9 outs (13 of suit - 4 you see)
- Open-ended straight draw (OESD): 8 outs
- Gutshot straight draw: 4 outs
- Two overcards: 6 outs
- Combo draws add up: Flush + OESD = ~15 outs
Frequently Asked Questions
Common questions about poker outs
How do I count my outs in poker?
Count the cards that will complete your hand. For a flush draw with 4 cards of a suit showing, there are 9 remaining (13 - 4). For a straight draw, count cards that complete it. An open-ended straight draw has 8 outs; a gutshot has 4 outs.
What is the Rule of 2 and 4?
A quick way to estimate equity: multiply your outs by 2 to get your approximate equity for one card (turn only), or by 4 for two cards (turn and river). This is slightly optimistic for high out counts but accurate enough for most decisions.
Why is exact equity different from the rule of 2/4?
The rule of 2/4 is an approximation. Exact equity uses combinatorics. With 9 outs and 47 cards remaining, turn equity is exactly 9/47 = 19.1%, not 18%. The difference grows with more outs. Use exact calculations for close decisions.
What are discounted outs?
Discounted outs account for the possibility that some of your outs give you the second-best hand. If you have a flush draw but suspect an opponent has a higher flush draw, you should discount some outs. Also discount outs that pair the board when you might lose to a full house.
How do I combine outs from multiple draws?
Add your outs but subtract overlapping cards. A flush draw (9 outs) + open-ended straight draw (8 outs) doesn't give you 17 outs because 2 cards complete both draws. So it's 9 + 8 - 2 = 15 outs.
How this works
Calculations follow the published mathematics of the game — combinatorics for cards, probability theory for dice, and expected-value accounting for wagers. Results are verified against independent references (primarily Wizard of Odds). No calculation here is an opinion or recommendation; it is arithmetic applied to the rules of the game.
What this tool can’t do
When to consult a professional
This tool computes probability and expected value. It is not a betting system and cannot predict the outcome of any individual wager. If gambling is causing problems for you or someone you know, call the National Problem Gambling Helpline at 1-800-GAMBLER.
Sources
- [1]Wizard of Odds — Michael Shackleford, ASAIndustrywizardofodds.comAccessed Apr 21, 2026
Actuary; widely cited casino-game probability reference. Used for house-edge and EV verification.
- [2]National Council on Problem GamblingOfficial sourcencpgambling.orgAccessed Apr 21, 2026
Responsible-gambling guidance and 1-800-GAMBLER helpline.
Joseph OrdunaFounder & Software Engineer
Full-stack software engineer specializing in embedded systems, web architecture, and AI/ML. Founder of Practical Web Tools. Built the gesture-controlled drone IP acquired by KD Interactive (Aura Drone, sold on Amazon).