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SPR (Stack-to-Pot Ratio) is one of the most important concepts in modern poker strategy. Defined by authors like Ed Miller, it determines how “committed” you are to a pot before the flop is even dealt.
This calculator computes your SPR and categorizes it into strategic zones (Low, Medium, High), helping you decide whether to play for stacks or exercise caution.
SPR Calc
How to Interpret SPR
SPR tells you how much game is left to play relative to the pot size.
- Low SPR (0 – 3): The Commitment Zone. If you hit Top Pair, you should generally be willing to get all-in. Bluffing is ineffective here because there isn’t enough money left to fold out opponents.
- Medium SPR (3 – 6): The Danger Zone. The pot is big enough to be tempting, but the remaining stacks are deep enough to punish you. Avoid getting all-in with one-pair hands here.
- High SPR (6+): Deep Stack Poker. You need strong hands (Sets, Straights, Flushes) to play for stacks. Top Pair loses value significantly.
Frequently Asked Questions (FAQ)
How do I calculate SPR?
The formula is simple: Effective Stack / Pot Size. For example, if the pot is $10 and you have $40 left, your SPR is 4. Always use the Effective Stack (the smallest stack involved in the hand).