Geometric Sizing

Tournament math

Calculate the optimal bet size to get all-in by the river across multiple streets

Input Parameters

Enter pot size, effective stack, and number of streets to calculate the optimal geometric bet sizing.

Pot Size

chips

Current pot size in chips or BB

Effective Stack

chips

Effective stack size (smaller of the two stacks)

Number of Streets

Number of betting streets remaining (2-3)

Geometric Sizing 61.8%(61.8 chips) Bet this percentage of the pot each street to get all-in by the river

Stack to Pot Ratio (SPR) 2.00

Final Calling Range 38.2%

MDF Each Street 61.8%

Flop

61.8%

Turn

61.8%

Minimum Defense Frequency your opponent needs to defend each street

Formulas · How to Use

Geometric Sizing 61.8%

Sizing = 0.5 × ((Pot + 2×Stack) / Pot)^(1/Streets) - 1)

Stack to Pot Ratio (SPR) 2.00

SPR = Stack ÷ Pot

MDF Each Street 61.8%

MDF = 1 / (Sizing + 1)

Final Calling Range 38.2%

The percentage of hands your opponent can profitably call down with across all streets

Final Range = MDF^Streets

How to Use

Geometric sizing helps you plan your betting across multiple streets to get all your chips in by the river. Enter the current pot size and effective stack, then select how many streets remain. The calculator will show you what percentage of the pot to bet each street, the MDF your opponent must defend, and what percentage of their range can profitably call down all streets.

2-Street Geometric Sizing Cheat Sheet Quick reference for common stack sizes

Stack (% Pot) SPR Geo Sizing MDF/Street

50% 0.50 20.7% 82.8%

75% 0.75 29.1% 77.5%

100% 1.00 36.6% 73.2%

150% 1.50 50.0% 66.7%

200% 2.00 61.8% 61.8%

300% 3.00 82.3% 54.9%

400% 4.00 100.0% 50.0%

500% 5.00 115.8% 46.3%