The biggest pot I ever won started with a call that "should" have been a fold. I had 6♠ 5♠ on the button, flopped an open-ended draw, and the pot odds on the flop said the price wasn't there. I called anyway — because the guy across the table had 200 big blinds and couldn't fold top pair to save his life. The straight got there on the river, his whole stack came with it, and I finally understood the number nobody explains well: implied odds.
Implied odds are why you can call a draw that "should" be a fold — and why deep stacks make speculative hands so profitable in the right spots and so dangerous in the wrong ones. The trouble is that most players treat them as a magic word that justifies any call. It isn't. It's a number you can estimate, and this guide shows you how.
The raw odds behind every draw come from the 
poker odds and probability chart; this guide is how you decide when those odds — plus the money still to come — actually make a call profitable. It picks up exactly where 
pot odds leave off.
Implied odds at a glance
What Are Implied Odds in Poker?
Implied odds are the extra chips you expect to win on later streets when your draw completes — added on top of the pot that's sitting there right now. Pot odds only ask "is the current price worth it?" Implied odds ask the fuller question: "is the current price plus everything I'll win later worth it?"
That difference is why you can call a flop bet with a flush draw that isn't getting the immediate price. The pot in front of you doesn't pay enough — but if a heart lands and your opponent pays off a big river bet, the total you win covers the call many times over.
Here's the catch that makes or breaks the whole concept: that future money is an estimate, not a fact. It depends entirely on how deep the stacks are and how likely your opponent is to pay you when you hit. Assume too much, and "implied odds" becomes a story you tell yourself while lighting chips on fire.
Implied Odds vs Pot Odds: The Key Difference
Pot odds count only the money in the pot right now; implied odds add the money you expect to win later if you hit. They're not rivals — implied odds are pot odds extended into the future.
The practical rule: start with pot odds. If your equity already beats the price, call — no story needed. If your draw just misses the price, that's when implied odds become the tie-breaker. And if your draw misses the price by a mile, implied odds usually can't save it either.
How to Calculate Implied Odds
To calculate implied odds, figure out how much extra you need to win when you hit, using: extra needed = (your call ÷ your hit chance) − the current pot. If you can realistically win that much more on later streets, the call is profitable.
Written cleanly, with x as the extra money you must win when you complete:
Find your hit chance
Count outs, convert to a percentage (the Rule of 4 and 2 gets you close)
Divide your call by that hit chance
This is the total you need to win to break even
Subtract the pot that's already there
What's left is the extra you must win later — that's your x
Judge if it's realistic
Deep stacks + a payoff-happy opponent = yes. Short stacks or a scary board = no
The formula in one line: x = (call ÷ hit%) − current pot. If the extra money you'd realistically extract on later streets is bigger than x, calling is profitable even when the immediate pot odds say fold.
A Worked Example: Flush Draw on the Turn
Let's run the numbers so the formula stops being abstract.
You hold A♥ K♥ on a Q♥ 7♥ 2♣ 3♠ board — the nut flush draw, 9 outs, with one card to come. The pot is $100 and your opponent bets $50 on the turn, so there's $150 in the middle and it's $50 to you.
- •Pot odds first: you're getting 150-to-50, or 3-to-1, so you need 25% equity. Your flush hits on the river just 19.6% of the time (9 outs ÷ 46 unseen cards). 19.6% is less than 25%, so the immediate price says fold.
- •Now the implied odds: x = (call ÷ hit%) − pot = (50 ÷ 0.196) − 150 = 255 − 150 = about $105. That's the extra you must win on the river when your flush lands.
:::note Same $50 call, opposite decisions — and the cards never changed. What changed is how much money is left to win. That's implied odds in one sentence. :::
How Much Do You Need? Implied Odds by Draw Type
As a rule of thumb, the harder your draw is to hit — and the more obvious it is when it lands — the deeper the stacks need to be before a call is profitable. Below is a practical field guide. Treat the stack multiples as heuristics, not laws — they bake in the reality that you won't always get paid and won't always win when you hit.
| Draw | Outs | Hit % (1 card) | Stacks behind needed |
|---|---|---|---|
| Flush draw | 9 | 19.6% | ~8–10× the call |
| Open-ended straight | 8 | 17.4% | ~8–10× the call |
| Set (pocket pair) | 2→set | ~11.8% flop | ~15–20× the call |
| Gutshot straight | 4 | 8.7% | ~20×+ (rarely worth it) |
Two forces set the number. Frequency: a gutshot hits half as often as a flush draw, so it needs the payoff to be roughly twice as big to break even. Disguise: a hidden set gets paid far more than an obvious four-flush, because your opponent can't put you on it — which is why sets tolerate their low hit rate. The 
nut flush draw is worth far more than a baby one for the same reason: it gets paid and it doesn't lose when it hits.
Set Mining: Small Pocket Pairs and Implied Odds
You flop a set (or better) with a pocket pair just 11.8% of the time — about 7.5-to-1 against, or 1 in 8.5 — so set mining only profits when the stacks behind cover all the times you miss. This is the purest implied-odds play in poker: you call a raise with a small pair for one reason only — to flop three of a kind and stack someone.
Because you miss seven times out of eight, the math is brutal unless the payoff is huge. The common guideline is the "5% rule": only call to set-mine if the effective stacks are at least 20× your call (your call is ≤5% of the stack).
Here's the honest breakdown most articles skip:
- •The pure break-even is 7.5-to-1. In a fantasy where you win your opponent's entire stack every time you flop a set, you'd only need about 7.5× behind.
- •Real life demands 15–20×. You won't always get the whole stack, you'll sometimes flop a set and still lose (set-over-set, or they fill a bigger hand), and position matters. The extra cushion covers those leaks.
- •So 7.5-to-1 is the theoretical floor; 15–20× is the practical rule. Don't confuse the two — using the 7.5 number as your real-table guide is a slow leak.
drawing odds; the takeaway here is that small pairs are gold when stacks are deep and trash when they're short — the pair didn't change, the implied odds did.Reverse Implied Odds: When Hitting Your Draw Still Loses
Reverse implied odds are the chips you lose when you complete your hand but it's still second best. Implied odds are the money you win when you hit; reverse implied odds are the money you bleed when you hit and lose anyway. Ignore them and you'll fall in love with draws that are quietly traps.
Three classic reverse-implied spots:
- •The baby flush. You hold 7♦ 6♦ and the board brings a third diamond. You make your flush — and pay off a stack to the guy holding A♦ for the nut flush. Your "winning" card cost you money.
- •The dummy end of a straight. You hold 6♦ 5♦ on 9♥ 8♣ 2♠, and a 7 on the turn makes your 5-6-7-8-9. But it's the low end — anyone holding J-T now has 7-8-9-10-J, a higher straight, and the very card you needed pays them off.
- •The dominated top pair. You pair your king with a weak kicker and keep calling — straight into someone's A-K.
When NOT to Rely on Implied Odds (Common Mistakes)
The moment your opponent is all-in, your implied odds are exactly zero — there is no more money to win, so you're back to pure pot odds. This is the single most abused concept in poker: "I had implied odds" is the excuse players reach for after a call that was never justified.
Watch for these leaks:
Villain is all-in
No future streets means no future money. Implied odds = 0. Use pot odds only
Short stacks behind
If there's only half a pot left to win, "I'll get paid on the river" is a fantasy
A "no-pay" opponent
A nit who only bets the nuts won't pay off your flush. Your implied odds live and die on their willingness to call
A scary board
If the card that completes your draw also freezes the action (four to a flush, paired board), nobody pays you
Assuming stacks off
"It might get there and they might stack off" is two guesses stacked on a fold. Estimate conservatively
I lost more chips to imaginary implied odds than to any bad beat. The fix is a single honest question before you call a draw that misses the price: "When I hit, who is actually paying me, and how much?" If you can't name the money, it isn't there.
FAQ
The 3 Things to Remember
1. The formula: extra needed = (call ÷ hit%) − current pot. If you can realistically win more than that later, the call is good even when pot odds say fold. 2. The reality check: implied odds are an estimate that lives on deep stacks and a paying opponent. Against an all-in or a short stack, they're zero — fall back on pot odds. 3. The dark mirror: reverse implied odds punish non-nut draws. A draw to the nuts is worth far more than the same draw to second best.
Get this right and you stop torching chips on hopeful calls while still making the profitable ones nobody else dares to. From here, lock in the raw numbers with the poker odds and probability chart, or see exactly how often each draw lands in drawing odds.