The SPR & Commitment Visualizer
Calculate your Stack-to-Pot Ratio on the flop. Instantly know if you are mathematically committed to the pot or if you need a premium hand to play for your entire stack.
Understanding SPR
The Stack-to-Pot Ratio (SPR) is one of the most important concepts for post-flop play. It answers the hardest question in poker: “Do I have to call an all-in here, or can I fold?” SPR measures the relationship between the money already in the pot and the money left in the stacks. By calculating this number, you can map out your entire strategy for the rest of the hand and avoid losing massive stacks with mediocre cards.
SPR & Commitment Visualizer
Calculate your Stack-to-Pot Ratio on the flop to instantly know if you are committed to the pot or if you need a monster hand to proceed.
Why We Only Calculate SPR on the Flop
You should only calculate your SPR once per hand. You do this at the exact moment the dealer reveals the three flop cards, before anyone makes a bet.
SPR is a planning tool. It tells you if you have enough chips to bet on the flop, turn, and river, or if the money will run out sooner. Once you reach the turn or river, the planning phase is over. At those later streets, you transition to using Pot Odds to make your decisions.
The Three Commitment Zones
Pay close attention to the colored result box at the bottom of the visualizer. It translates your SPR number into a direct strategy.
- Low SPR (0 to 3): You are pot committed. The pot is already large compared to the remaining stacks. A single strong pair like Top Pair or an Overpair is usually enough to play for all your chips. Folding a strong pair here is a mathematical mistake.
- Medium SPR (3 to 6): This is the danger zone. There is still money behind, but one big bet and a raise will put you all-in. You generally need at least Two Pair to feel comfortable committing your entire stack.
- High SPR (6+): The stacks are very deep. There is plenty of room to maneuver, bluff, and control the size of the pot. To justify putting your entire stack in the middle, you need a true monster hand like a Set, Straight, or Flush. Pushing all-in with just one pair in a High SPR situation is a common and expensive beginner mistake.
How to Use This Tool Tool
Enter the specific numbers from your current table situation. The tool handles the complex logic for you.
- Pot Size: Enter the total chips in the middle right as the flop is dealt.
- Your Stack & Opponent Stack: Enter the remaining chips for both players. The tool will automatically find the “Effective Stack”. This is the smaller of the two stacks, representing the absolute maximum amount of money that can be won or lost in the hand.
- The SPR Number: The calculator divides the effective stack by the pot size to give you your SPR.