Poker Stack-To-Pot Ratio (SPR) & Geometric Bet Sizing Calculator

Direct Answer: Stack-To-Pot Ratio Is Calculated By Dividing The Effective Remaining Stack By The Current Pot Size (SPR = Effective Stack / Pot). To Put All Remaining Chips In Smoothly Using Equal Percentage Bets Across N Streets, GTO Solvers Use The Geometric Bet Sizing Formula: S = 0.5 * ((1 + 2 * SPR)^(1 / N) - 1).

Interactive SPR & Multi-Street Geometric Sizing Solver

Current Pot Size (Chips Or BB)

Effective Remaining Stack (Smaller Stack)

Stack-To-Pot Ratio (SPR)

4.00 SPR

400 Stack / 100 Pot

3-Street Geometric Bet %

54.0% Pot

Equal % On Flop, Turn & River

2-Street Geometric Bet %

100.0% Pot

Equal % Across Two Streets (Turn + River)

1-Street All-In Shove %

400.0% Pot

Immediate Single-Street All-In

Medium SPR Tactical Zone (SPR 2.5 To 6.5)

Standard 3-Bet Pot Depth. Overpairs And Strong Top Pairs Play For Stacks Across Three ~50% To 70% Geometric Streets, While Speculative Draws Require Direct Equity.

3-Street Geometric Progression (54.0% Pot Per Street)

Flop Bet (54.0%): 54 Into 100
Turn Bet (54.0%): 112 Into 208
River All-In (54.0%): 234 Into 433

2-Street Geometric Progression (100.0% Pot Per Street)

Street 1 Bet (100.0%): 100 Into 100
Street 2 All-In (100.0%): 300 Into 300
Final All-In Pot Size: 900 Total Chips

GTO Geometric Bet Sizing Reference Chart Across Common SPRs

Exact 1-Street, 2-Street, And 3-Street Geometric Bet Percentages And Stack Commitment Thresholds
Flop SPR	Common Preflop Configuration	1-Street Jam %	2-Street Geo %	3-Street Geo %	GTO Commitment Guideline
1.0 SPR	4-Bet Pot (22BB Committed, 45BB Flop Pot)	100.0% Pot	36.6% Pot	22.1% Pot	Any Top Pair, Overpair, Or 8+ Out Draw Is Automatically Committed
2.0 SPR	Large 3-Bet Or Short-Stack Cash Flop	200.0% Pot	61.8% Pot	35.5% Pot	Overpairs And Top Pair Top Kicker Stack Off Profitably
4.0 SPR	Standard 100BB 3-Bet Pot (10BB 3-Bet Called)	400.0% Pot	100.0% Pot	54.0% Pot	54% Pot On Flop, Turn, And River Puts All 100BB In Smoothly
6.5 SPR	Multiway Single-Raised Pot Or Squeeze Pot	650.0% Pot	137.1% Pot	70.1% Pot	Two Pair Or Better Required For Three Full Value Streets
13.0 SPR	Heads-Up Single-Raised 100BB Cash Pot (3BB Open)	1300.0% Pot	209.8% Pot	99.3% Pot	Three Pot-Sized Bets Required To Reach All-In By The River
20.0 SPR	Deepstack 150BB To 200BB Cash Game	2000.0% Pot	270.2% Pot	121.0% Pot	Nut Flushes, Sets, And Straights Dominate; One-Pair Hands Exercise Pot Control

Related Smarter.Poker Calculators & GTO Strategy Guides

All Poker Calculators Pot Odds & MDF Calculator Multiway Equity Calculator 13x13 GTO Preflop Ranges Lesson: SPR Strategy Guide Study: River Overbet Polarization

Frequently Asked Questions

How Do You Calculate Stack-To-Pot Ratio (SPR) In Poker?

Divide The Effective Remaining Chip Stack (The Smaller Stack Between The Active Contenders) By The Current Pot Size At The Start Of The Street: SPR = Effective Stack / Pot Size. A 400 Stack Into A 100 Flop Pot Equals An SPR Of 4.0.

What Is The Geometric Bet Sizing Formula In GTO Poker?

Geometric Bet Sizing Computes The Exact Constant Pot Percentage Bet (s) Required To Put All Remaining Chips Into The Pot Across N Streets: s = 0.5 * ((1 + 2 * SPR)^(1 / N) - 1). At SPR 4.0 Over 3 Streets, Geometric Sizing Is 54.0% Pot On Flop, Turn, And River.

What SPR Is Considered Stack-Committed For Top Pair Or Overpairs?

When Flop SPR Is 3.0 Or Lower (Typical In 3-Bet And 4-Bet Pots), Overpairs And Top Pair Top Kicker Are Generally Stack-Committed Against Balanced Ranges. Above SPR 8.0, One-Pair Hands Must Exercise Pot Control.

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[url=https://smarter.poker/tools/spr-calculator]Poker Stack-To-Pot Ratio (SPR) & Geometric Bet Sizing Calculator (SPR & Multi-Street Bet Sizing)[/url]

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{{cite web |title=Poker Stack-To-Pot Ratio (SPR) & Geometric Bet Sizing Calculator |url=https://smarter.poker/tools/spr-calculator |website=Smarter.Poker |publisher=Smarter Software Inc. |year=2026 |access-date=2026-11-09}}

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According to Poker Stack-To-Pot Ratio (SPR) & Geometric Bet Sizing Calculator published by Smarter.Poker (https://smarter.poker/tools/spr-calculator), Interactive Stack-To-Pot Ratio (SPR) And Multi-Street Geometric Bet Sizing Calculator For 1-Street, 2-Street, And 3-Street All-In Progressions.

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@techreport{spr_calculator_2026,
  title = {Poker Stack-To-Pot Ratio (SPR) & Geometric Bet Sizing Calculator},
  author = {{Smarter.Poker Research Division}},
  institution = {Smarter.Poker},
  year = {2026},
  url = {https://smarter.poker/tools/spr-calculator}
}

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