Stack-to-Pot Ratio (SPR) in Poker

27 May 2026

Advanced

This material is for experienced players

The concept of stack-to-pot ratio, or SPR, was first introduced by Ed Miller in the book Professional No-Limit Hold’em: Volume 1.

In this article, I will explain the basics of SPR in poker and show you how it can help simplify postflop decisions in cash games.

Let’s say you open from MP to $6 in a $1/$2 NL cash game. BTN calls, and both blinds fold.

If both you and your opponent started the hand with $100 stacks, the stack-to-pot ratio will be:

SPR = 94/15 = 6.3

In other words, the remaining effective stack is 6.3 times bigger than the pot.

SPR can also be viewed as a risk-to-reward ratio.

In every hand of No-Limit Hold’em, the pot is the reward, while the effective stack is the potential risk. So, the higher the SPR, the bigger the risk relative to the reward.

• SPR must always be calculated using the effective stack
• If you have $150 and your opponent has only $100, the effective stack is still $100 because neither of you can win or lose more than that amount
• SPR is only used on the flop. It is not used on the turn or river

Low SPR

Low-SPR spots are usually simple to play because there are fewer possible actions available. The pot is already large compared to the remaining stacks, so there is not much room to maneuver.

For example, if the pot is $10 and you have only $20 left, you cannot realistically float the flop and then check-raise all-in on the turn.

High SPR

High-SPR spots are much more difficult to play because there is still a lot of money left behind for future streets. Decisions become more complex, especially with medium-strength hands.

Different hand strengths perform better at different SPRs. Once you understand this, you can start manipulating the pot size preflop to create more profitable situations for your specific hand.

Let’s look at several situations where you hold  on a board of . You have top pair top kicker, but the board is highly coordinated.

1. High SPR Example

If the pot is $10 and the effective stack is $200:

SPR = 20

If you bet the flop and face a check-raise, you are suddenly in a very difficult spot. Your hand may still be best, but stacking off with only one pair feels uncomfortable when stacks are deep.

If all the money goes in on the flop, turn, or river, your hand will often not be good enough.

This is why top-pair hands become difficult to play in medium and high-SPR spots.

2. Low SPR Example

Now imagine the pot is still $10, but the effective stack is only $30:

SPR = 3

In this situation, if you bet the flop and get raised, life becomes much easier. Calling or jamming is now completely reasonable because the remaining stack is small relative to the pot.

Your opponent can still have a better hand, of course, but now the risk is much lower compared to the reward. You are essentially pot-committed already.

Notice that your hand strength did not change in either example. The only thing that changed was the SPR.

• Low SPR = 0-6
• Medium SPR = 7-16
• High SPR = 17+

These categories are only rough guidelines. The correct interpretation also depends heavily on your opponents and the types of hands involved.

1. Hands for Low SPR

• Overpairs
• Top pairs
• Bottom two pair

These are hands that usually do not want to play massive pots when stacks are deep. A low SPR simplifies decisions and allows these hands to perform better.

With medium-strength hands, you generally want to avoid playing huge pots when stacks are deep.

2. Hands for Medium SPR

• Top two pair
• Sets
• Strong draws
• Flushes and straights

These hands are much stronger and can comfortably play for stacks in medium-SPR situations.

When they hit hard, there is much more money available to win on later streets.

3. Hands for High SPR

• Sets
• Strong combo draws
• Nut flushes
• Nut straights

These are the types of hands that are usually strong enough to comfortably stack off deep.

When SPR is high, you generally want either a near-nuts hand or a very powerful draw before committing a large amount of money.

There are two main ways to influence SPR:

• Adjust your preflop raise sizing
• Avoid entering certain pots altogether

You will not always be able to create the perfect SPR, but sometimes you can influence it.

Example 1 — Raising to 3bb

You hold  in a $1/$2 NL 6-max game with $100 effective stacks.

You raise to 3bb from MP and get called by the CO.

PR becomes:

SPR = 6.3

This SPR is somewhat awkward for stacking off comfortably with only top pair top kicker, especially against tighter opponents.

Example 2 — Raising to 6bb

Same situation, but now you raise to 6bb preflop instead of 3bb.

Your opponent calls again.

Now the flop SPR becomes:

SPR = 3.3

This is a much more comfortable SPR for stacking off with TPTK. The money usually goes in earlier, often by the turn, which also helps avoid difficult river decisions.

Suppose you hold a small pocket pair like , but the effective stacks are shallow.

In this case, calling or raising may not be profitable because the SPR will be too low.

You will not have enough implied odds to hit a set, and you also will not have enough fold equity to turn your hand into a bluff later in the hand.

That is why small pairs and suited connectors become much weaker in low-SPR situations.

The most important lesson from this concept is that planning ahead matters.

Strong poker players do not wait until the flop to start thinking. They already understand what kind of SPR they are likely to create before entering the pot.

Another key takeaway is how dramatically pot size on the flop affects strategy. The exact same hand can become easy or difficult to play purely because the SPR changed.

You will not always be able to create your ideal SPR, but opportunities to do so appear often enough that you should pay close attention to them.

Postflop poker becomes much easier once you start thinking ahead and understanding how SPR changes the value of different hands.