Geometric Bet Sizing: Planning Your Bets Across All Streets
Learn to calculate bet sizes that optimally grow the pot over multiple streets — the mathematical framework for getting all your chips in by the river.
What Is Geometric Sizing?
Geometric sizing means choosing a bet size on each street such that, after betting all three streets, you get your entire stack in. The bet is a consistent fraction of the pot on each street.
Why It Matters
Without geometric planning:
- You bet too small early → can't get stacks in by the river
- You bet too large early → overcommit with marginal hands
- Your sizing across streets is inconsistent → opponents can exploit it
The Geometric Formula
Bet Fraction = (Target Stack / Pot) ^ (1/Streets Remaining) - 1
In simplified terms:
| Target | Streets Left | Each Street Sizing |
|---|---|---|
| All-in by river | 3 (F/T/R) | ~75% pot each |
| All-in by river | 2 (T/R) | ~100% pot each |
| All-in by river | 1 (R) | All-in (whatever it is) |
Practical Example (100BB Pot)
Starting pot: 6BB. Your stack: 97BB. Goal: stack off by river.
Option A: Geometric
- Flop: Bet 5BB (83%) → Pot becomes 16BB. Stack: 92BB
- Turn: Bet 13BB (81%) → Pot becomes 42BB. Stack: 79BB
- River: Bet 42BB (100%) → All-in river bet
Option B: Non-Geometric (Common Mistake)
- Flop: Bet 2BB (33%) → Pot becomes 10BB. Stack: 95BB
- Turn: Bet 5BB (50%) → Pot becomes 20BB. Stack: 90BB
- River: Need to bet 90BB into 20BB pot → 450% overbet (awkward)
When to Use Geometric Sizing
- With very strong hands → You want to get stacks in
- In 3-bet pots → Already a big pot, fewer streets needed
- When you have the nut advantage → Build the pot confidently
- Deep stacks → You need bigger flop/turn bets to get it all in
When NOT to Use Geometric
- Medium-strength hands → You don't want to get all-in (pot control)
- Dry boards with small bets → 33% flop bets are fine and don't need geometric river shoves
- Short stacks → Math handles itself; you'll be all-in by turn anyway
Street-by-Street Planning
Before you bet the flop, ask:
- Do I want to get all-in this hand?
- How many streets of value can I extract?
- What sizing on each street gets me there?
If the answer to #1 is yes → use geometric sizing. If no → use pot control sizing (smaller bets, possibly check one street).
Integrating with Your Strategy
- Value hands: Geometric sizing to maximize extraction
- Bluffs: Match your value sizing so opponents can't tell the difference
- Medium hands: Non-geometric, pot control oriented
💡 Planning your bets backwards from the river is the hallmark of an advanced player.
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