How to use the SPR calculator
- Enter your stack and your opponent's stack after the preflop betting.
- Enter the size of the pot when the flop is dealt.
- Read your SPR, the commitment zone, and the hands that are usually strong enough to play for stacks.
What is SPR?
SPR (stack-to-pot ratio) is the effective stack divided by the pot on the flop. It tells you how many pot-sized bets are left behind, and so how much of your stack you are risking relative to what you can win.
SPR = effective stack ÷ pot on the flop
Example: at $1/$2 you raise to $10, one player calls, the blinds fold. The pot is $23 and you both have $190 left. SPR = 190 ÷ 23 ≈ 8.3.
SPR zones
| SPR | Zone | Hands happy to get all-in |
|---|---|---|
| Under 1 | Committed | Almost any pair or good draw |
| 1 to 4 | Low | Top pair good kicker, overpairs |
| 4 to 10 | Medium | Two pair, sets, strong overpairs |
| Over 10 | High | Sets, straights, flushes |
How to use SPR in your game
Plan the hand before the flop. Big pairs like AA and KK prefer a low SPR, so 3-betting them shrinks the pot-to-stack ratio and makes it easy to get all-in with an overpair. Small pairs and suited connectors prefer a high SPR, because they rely on implied odds to win big pots when they hit.
Read the full guide: What is SPR in poker?
FAQ
Is SPR measured before or after the flop?
SPR is measured on the flop, using the pot and stacks after all preflop betting is finished.
What is effective stack?
The smaller of the two stacks. You can never win or lose more than that in a hand. See effective stack.
Does SPR matter in tournaments?
Yes. Short stacks in tournaments often have very low SPRs after a raise and call, which is why so many tournament hands become all-ins.