Poker Term Spr
What does SPR mean in poker? Stack-to-pot ratio, or SPR, is a mathematical solution to figuring out a poker player’s commitment level on any given flop in cash games. The SPR is represented numerically and is calculated by dividing the amount of the flop into the effective stack size of the players involved in the hand. Stack To Pot Ratio. In Professional No Limit Holdem, the authors describe how our decisions vary based on the size of the pot in relation to our stack. For instance, if we had pocket kings on an Ace hi flop with a pot of $1, we might play the hand differently if we had 1 cent behind, than if we had $100 behind.
- Note – SPR stands for Stack to Pot Ratio. I think a lot of SPR importance is based solely on the texture of the games you are playing in. To say a general statement like 'SPR of 13 is bad for top pair' would be wrong, since with aggressive history 13 is an amazing, optimal even, spr for top pair.
- The Stack-to-Pot Ratio, or SPR for short, is defined as the ratio of the effective stack-size divided by the size of the pot. It is important to know for betting and commitment purposes. For example, if the effective stack size (smaller of the two stacks) is $200 and the pot is $50 the SPR is 4.
There are all sorts of mathematical equations that can be utilised in poker to assist players to help with their decision making in game.
In order to become successful long term players, we must have a good understanding of poker math theory so it can be applied in real time during live or online play.
Although not the most sexiest subject in the game, a lack of understanding in basic math can lead to costly errors down the track and force our win rate or return on investment to take a substantial hit.
In this article I will introduce the stack to pot ratio equation and how you can use it in game to boost your win rate and results.
What is the stack to pot ratio?
The stack to pot ratio (SPR) is a simple basic calculation that tells us how much we are willing to risk to win a hand.
The equation is calculated post flop and applies on the flop only and before any betting is done. The formula is:
For example, we head to the flop as the pre flop raiser and only the big blind calls. The pot size is 6.5BB. I have 97BB in my stack, the big blind has 40BB in theirs.
The effective stack is 40BB, as I can only win what the big blind has remaining. The stack to pot ratio is: 6.2
6.2 = 40 / 6.5
Depending on what blog you read or what poker book you have, you will find that there is conflicting information on what a low, medium and high SPR is. Some books will say that a low SPR is 2.5, others will say 3-4, and then others will say 6.
As per usual in life the answer lies somewhere in the middle.
Through experience of playing hundreds of thousands of hands I have come up with my own conclusions on optimal stack to pot ratio numbers:
- Low SPR: < 4
- Middle SPR: 4-10
- High SPR: > 10
How to interpret the stack to pot ratio
By calculating the SPR we can make a logical decision if we want to play for all the money on the flop.
Below is a hand strength guide which we can use to determine how willing we are to play for all the money on the flop based on the stack to pot ratio:
The basic premise is the higher our SPR is, the higher our hand strength must be to auto stack off on the flop. Overpairs also do well in SPR’s of 6 and below.
Bare also in mind that these numbers are fluid. If you have a specific read on villain and know they like to stack off light, then getting it in with top pair when the SPR is 6 is viable.
Another point to keep in mind is 3bet pots usually create an SPR of roughly 4. This allows you to stack off comfortably with top pair and overpair type holdings.
Draws can be tricky to play with middling SPRs because you can be forced to call it off on the flop if you are presented with the right pot odds.
This can happen if you check raise the flop from the big blind with the nut flush draw and then face a jam. If presented with correct pot odds I advise to make the call, even if the SPR suggests otherwise.
Examples of using the stack to pot ratio
Alright, let's look at a few different examples of using stack to pot ratio in poker. Hopefully this will give you a better understanding of how to use SPR at the tables yourself.
Low SPR example
Button (Hero) 100BB vs BB (villain) 26BB
We hold A♠ K♣
Flop
4♠ 8♦ A♥
Pot is 6.5BB, SPR is 4. Villain donks for 3BB.
Hero should raise to 9BB and look to call a jam from the BB.
This is an easy stack off opportunity on the flop. We flop top pair top kicker in a low SPR of 4.
Middle SPR example
Button (Hero) 100BB vs BB (villain) 50BB
We hold 4♥ 4♣
Flop
4♠ 6♦ 7♦
Pot is 6.5BB, SPR is 7.7. Hero cbets 4BB. Villain check raises to 12BB.
Hero should jam.
Here the SPR is a little higher at 7.7. We flop bottom set and face a check raise on a wet board.
On this flop we should look to get it in immediately as there are many cards on the turn and river that will kill the action.
Any diamond, 3, 5, 8, 9 and T (almost half the deck!) are bad cards for us and we would rather get our money in on the flop when we are ahead the majority of the time.
High SPR example
Button (Hero) 100BB vs BB (villain) 100BB
We hold A♠ A♥
Flop
8♠ 8♥ 5♥
Pot is 6.5BB, SPR is 15.4. Hero cbets 2.5BB. Villain check raises to 10BB.
Hero should call.
In this example the SPR is high at 15.3. Our threshold for stacking off on the flop at this level should not be overpairs. Hero should call and reassess the action on the turn.
My Free Poker Cheat Sheet Teaches You How to Make $500-$1000 Per Month Playing Poker
Are you having trouble beating low stakes poker games online or live in the casino? Are you interested in making a consistent part time income playing these games?
That is why I wrote this free little 50 page poker cheat sheet to give you the exact strategies to start consistently making solid money in low stakes poker games right now.
These are the exact poker strategies by the way that I have used as a 10+ year poker pro. And I lay them all out for you step by step in this free guide.
Enter your details below and I will send my free poker cheat sheet to your inbox right now.
How the stack to pot ratio can help your poker win rate
Here are a few concepts we can use both pre flop and post flop to assist us in how we plan a hand. First we need to take note of our opponents' stack sizes.
One of the most important and underrated skills we can undertake is to be more aware of our opponents stack size when heading to the flop.
Once we have a rough idea of the SPR, we can plan accordingly and decide whether we want to play for all the money before we perform our action.
You should have a rough idea of the SPR in every hand you play.
We can also exploitatively fold and not cold call marginal holdings such as low pocket pairs and suited connectors pre flop when facing an open raise from a short stacked player (60BB or less).
These holdings perform best with SPRs of 10 and higher.
The logic here is that you need to have the opportunity to win a large pot to balance out all the times when you call a raise and are forced to fold when you miss.
This is something that Phil Ivey talks about in a lot more detail in his recent MasterClass poker training.
Tailor your preflop bet sizing to your preferred stack to pot ratio
This situation will occur usually when we face opponents who open limp with a short stack. The general advice is to isolate the limper by raising to 4BB if you have a hand worth playing.
I would add to this advice that you can and should exploitatively raise larger to at least 6BB (or sometimes higher) when you hold a high pocket pair.
The limper will still call the majority of the time and by raising larger you create a larger pot heading to the flop which creates a smaller stack to pot ratio.
Poker Term Spring
Smaller SPRs benefit big overpairs as you can easily get it in on the flop if facing aggression. By the way, I have already written the complete guide on when to fold your overpair.
We can also use this advice when 3 betting. Instead of 3 betting to a conventional 9 or 10BB we can opt for a larger sizing, such as 11 or 12BB.
If our 3bet is called we often head to the flop with an SPR of under 4 (assuming we are playing for 100BB), which can make our decisions easier if we decide to play for all the money.
I would advise against opening the pot (meaning we raise first in before any limpers) pre flop to a sizing higher than 3BB.
Even though this creates a smaller SPR, it forces your opponents to play perfectly against you by calling tighter and 3betting hands that have you crushed.
Unless there are major whales at your table, your raise first in size should be between 2.5-3BB. Remember we make money in poker from our opponents mistakes, not by forcing them to play well.
Proceed with caution when playing deep stacked
There is no worse feeling in poker than accumulating a 200BB stack, only to lose it all after overvaluing an overpair or the low end straight. Or having to think about folding bottom set on the flop when the SPR is 30.
Personally I hate playing deep stacked and to this day I avoid it like the plague. I make a conscious effort to reload the table once my stack is 150BB or higher.
I prefer to keep my decisions as simple as possible at the table and I achieve this by sticking to a stack size of around 100-150BB.
I'm not saying that you should do this as well but mastering how to play one stack size is superior than being average at short, regular or deep stacked.
If you stick to one stack size then you get used to what the SPR’s will be and your post flop decisions will become much easier.
If you find yourself playing deep stacked for 200BB often then be aware that the SPR will be between 25 and 30 routinely.
That means your threshold for stacking off on the flop should in theory be much higher and will be narrowed down to middle and top set, and nutted flushes and straights.
For much more on playing optimal deep stacked poker (and how to use SPR when super deep), check out the The Upswing Poker Lab.
Final thoughts
The stack to pot ratio is a simple math calculation we can utilise on the flop to decide how willing we are to risk our stack to win the hand. The higher the SPR is on the flop, the higher our threshold and hand strength will be for getting all the money in.
Try and make a habit to know what the SPR is every hand you play so you know how to proceed on the flop if you face aggression.
In doing so it will allow more clarity in our post flop decision making process.
Lastly, if you want to know the complete strategy that I have used to crush small stakes poker games as a 10+ year pro, make sure you grab a copy of my free poker cheat sheet.
This article was written by Ryan Lewis. Ryan specializes in 6max cash small stakes online poker. He focuses on playing a fundamentally strong tight and aggressive strategy. He particularly enjoys the statistics and game theory side of the game. You can follow him on Twitter right here.
Let me know your thoughts in the comments below on stack to pot ratio. Do you use stack to pot ratio at the poker tables to improve your decision making?
Note: What follows is an edited excerpt from Advanced Pot-Limit Omaha Volume I: Small Ball and Short-Handed Play.
In Professional No-Limit Hold’em, authors Matt Flynn, Sunny Mehta, and Ed Miller introduced the stack-to-pot ratio (SPR), which is simply the ratio of the effective stacks to the current size of the pot. For example, if you have a $1,000 remaining stack and there is $100 in the pot, then your SPR is $1,000/$100 or simply 10. Alternatively, let’s say there’s $100 in the pot, you have a $1,000 stack (for an SPR of 10) and are heads up with an opponent who only has a $300 stack (for an SPR of $300/$100 or 3); in this case, the effective SPR is the SPR of the smaller stack — which is 3 — because the size of the smaller stack is all that you are playing for.
As it happens, the SPR is a quite useful tool for thinking about pot-limit Omaha (PLO). In fact, the SPR is perhaps an even more useful concept for pot-limit Omaha than no limit hold’em due to the bet-size restrictions of pot-limit play, as well as the relatively standard (pot-sized) bet sizing used in PLO; both of these aspects serve to make the application of the SPR more rigid.
What Does SPR Actually Mean?
Poker Term Splash The Pot
So what does SPR actually mean to us, and how do we use it?
The first thing you need to know is that an SPR of 1 means that there is one pot-sized bet left; an SPR of 4 means there is enough left for two pot-sized bets heads-up or a pot-sized bet and a pot-sized raise; an SPR of 13 is the equivalent of three pot-sized bets heads-up.
In other words, if there is $100 in the pot on the flop and we have $100 effective stacks, then there is enough money left to make exactly one pot-sized bet. If instead we have $400 stacks, then there is enough to make $100 pot-sized bet and a pot-sized raise to $400; alternatively, if we make a pot-sized bet on the flop and get one caller, then we have enough to make second pot-sized bet ($300) on the turn all-in. Meanwhile, if we have $1,300 stacks, there is enough money left to make a $100 pot-sized bet, a pot-sized raise to $400, and a pot-sized reraise all-in for $1,300 total; this is also enough to bet the pot on the flop and get a single caller, bet the pot on the turn and get called again, and then make one last pot-sized bet on the river all-in.
Note that if the effective SPR is over 13 and only two players contest the pot after the flop, the only way for all the money to go in is if somebody puts in a raise at some point in the hand.
Poker Term Spr
With that in mind, we’ll categorize an SPR < 1 to be an ultra-low SPR situation, and an SPR < 4 to be a low-SPR situation. We will also categorize an SPR between 4 and 13 as a mid-SPR situation, and an SPR > 13 as a high-SPR situation. The distinction is important, because as we will see, SPR has a dramatic effect on post-flop playing decisions.
PLO Tip: When the effective SPR is over 13 and only two players put money in the pot after the flop, the only way for all the money to go in is if somebody puts in a raise at some point in the hand.
High SPR Situations (SPR > 13): Big Pot Hands vs. Small Pot Hands
When the SPR is greater than 13, there are more than 3 pot-sized bets left to play, and you are in a high SPR situation and are in Big Play (Implied Odds) Territory. And when the stacks are this deep, it is most crucial to distinguish between big-pot and small-pot hands.
In my first book Pot-Limit Omaha Poker: The Big Play Strategy, the main focus was on the hands that are capable of winning the big pots, namely the nut straight with re-draws, the overfull (such as A-A-x-x on a A-K-K flop, or A-K-x-x on a A-A-K flop), top set (especially with re-draws), the nut flush, and dominating draws (such as the 16-card nut wrap on a rainbow flop, top pair and a 13-card nut wrap on a rainbow flop, or any of the above combined with a flush draw). These hands are universally strong in that they tend to do well no matter how deep you are.
In other words, you will be about as comfortable putting four bets in on the flop with these hands as you will one. And so generally speaking, you will ram and jam with these hands in an effort to get the money all-in on the flop against any amount of action.
Big Pot Hands: High SPR/Universal Hands
| The nut straight with re-draws |
| The overfull (A-A-x-x on A-x-x board, or A-K-x-x on A-A-K board) |
| Top set for the nuts (especially with re-draws) |
| The nut flush |
| Dominating draws |
But what do you do in a high-SPR situation when you aren’t that strong?
Let’s say it’s a $5-$5 game. There are five players and $25 in the pot on the flop, and everybody has $1,000 stacks for an SPR of 40, which equates to four pot-sized bets. You are last to act. The first player leads out with a $25 bet, and everybody folds to you.
As you know from our previous study it would be a disaster to commit your stack on the flop here with hands like the bare nut straight with no re-draws, the underfull (as in A-7-x-x on a A-7-7 flop or 7-7-x-x on a A-A-7 flop), middle set or bottom set, bare top two pair, undertrips (as in 8-7-6-5 on a Q-7-7 board), the second-nut flush, or a sucker wrap or draw. Because with an SPR of 40, it would take four pot-sized bets in order to get all-in heads up on the flop (your opponent bets $25, you make a pot-sized raise to $100, your opponent re-raises the max to $325, and you re-raise the max to $1,000 total).
Now this might seem obvious, but there are only three betting rounds after the flop in Omaha (the flop, the turn, and the river). And so, as noted earlier, the only way a fourth bet can physically go in is if somebody at some point in the hand puts in a raise. In this case, with your opponent leading the betting, it is probably going to have to be you. But sitting this deep, you are going to have trouble finding opponents who are willing to stick four bets in on the flop with a hand worse than yours. And so as a general rule, you should basically never (if ever) raise with any of these small-favorite/big-dog holdings when the SPR > 13; in fact, unless you are on a stone bluff (and can justify it), you should tend to refrain from raising on the flop in this spot at all unless you have a hand with which you actually want to put a fourth bet in of any kind.
Small Pot/Low SPR Hands
| The bare nut straight |
| The underfull |
| Middle or bottom set |
| Undertrips (i.e. 8-7-6-5 on A-7-7 flop) |
| The second-nut flush |
| Big non-nut wraps |
PLO Tip: When the SPR > 13 (there are more than three pot-sized bets left to play), you should tend to refrain from raising on the flop unless you have a hand strong enough to justify putting in a fourth bet; this generally means smooth-calling on the flop with small-pot hands when facing a bet.
Jeff Hwang is a gaming industry consultant and author of Pot-Limit Omaha Poker: The Big Play Strategy and the three-volume Advanced Pot-Limit Omaha series.