Geometric Sizing Calculator
Calculate the optimal geometric bet size across streets to get all-in by the river. Input pot, stack, and streets remaining for precise sizing.
Input
Results
Geometric Bet Size (% of pot)
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Stack-to-Pot Ratio (SPR)
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Street-by-Street Breakdown
Pot
Bet
Pot After
What Is Geometric Bet Sizing?
Geometric bet sizing is a strategy where you bet the same percentage of the pot on each remaining street, designed so that your final bet puts you exactly all-in on the river. This creates a smooth escalation of commitment that is mathematically optimal in many situations.
The Formula
To find the geometric bet fraction f across n streets:
f = ((Stack + Pot) / Pot)1/n - 1) / 2
Where Stack is the effective remaining stack and Pot is the current pot size.
Why Use Geometric Sizing?
- Maximizes value: By getting all-in exactly on the river, you don't leave money behind.
- Simplifies decisions: Bet the same percentage each street — no need to plan different sizes.
- Polarized ranges: Geometric sizing works best with polarized ranges (strong value hands and bluffs).
Stack-to-Pot Ratio (SPR)
The SPR (effective stack divided by pot) determines which geometric size to use. A high SPR means you need to bet larger fractions each street; a low SPR allows for smaller, more controlled bets. Generally, SPR below 4 means you can comfortably get all-in with standard sizing over the remaining streets.
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