SPR
Stack-to-Pot Ratio — the ratio of the effective stack to the pot
Definition
SPR (Stack-to-Pot Ratio) is the ratio between the effective stack (the smaller of the two remaining stacks) and the pot size on the flop. It indicates how many times the pot would fit into the remaining stack, which guides postflop decisions. A low SPR (below 4) means the stacks are short relative to the pot. In this setup, it's correct to commit the stacks with medium hands like top pair. A high SPR (above 10) means there are a lot of chips left to play — you need a very strong hand to go all-in because the potential losses are large. SPR should influence your preflop decisions: by adjusting the sizing of your opens and 3-bets, you control the postflop SPR. A 3-bet pot creates a low SPR that simplifies decisions with premium hands. Understanding SPR is essential to avoid ending up in uncomfortable postflop situations.
Pot = €10, effective stacks = €50. SPR = 50/10 = 5. With this SPR, top pair top kicker is generally strong enough to play for stacks. SPR = 15: you need at least two pair or better to consider going all-in.