Roulette Corner Bet Calculator: Four Numbers at Once

A corner bet covers four adjacent numbers with a single chip placement. Our calculator shows exact probability, payout structure, and expected value for this popular inside bet that balances coverage with payout.

What Is a Corner Bet?

A corner bet (also called square bet or quad bet) places a chip at the intersection of four numbers on the roulette layout. If any of those four numbers hits, you win 8:1 on your wager. It covers more numbers than straight-up but pays less.

Quick Answer: Corner bet covers 4 adjacent numbers, pays 8:1. Probability: 10.53% (European), 10.53% (American). House edge: 2.70% (European), 5.26% (American). Example: Chip on corner of 1-2-4-5 wins on any of those. Better coverage than straight-up, same house edge as all roulette bets.

How to Use Our Calculator

Use the Corner Bet Calculator →

Enter your corner bet to see probability and expected value.

Step-by-Step Instructions

1. Select Roulette Type: European or American

2. Choose Corner Numbers: Four adjacent numbers

3. Enter Bet Amount: Your wager

4. View Probability: Win chance

5. Calculate EV: Expected value

Input Fields Explained

Field	Description	Example
Roulette Type	European (37) or American (38)	European
Corner Numbers	Four adjacent	1-2-4-5
Bet Amount	Your wager	$10
Probability	Win chance	10.81%
Payout	If win	$80 + $10 = $90
Expected Value	Per spin	-$0.27

Corner Bet Probability

European Roulette (Single Zero)

Total pockets: 37 (1-36 + 0)
Numbers covered: 4
Win probability: 4/37 = 10.81%
Lose probability: 33/37 = 89.19%

Payout: 8:1
Fair payout: (37/4) - 1 = 8.25:1

House edge: (8.25 - 8) / 8.25 = 2.70%

American Roulette (Double Zero)

Total pockets: 38 (1-36 + 0 + 00)
Numbers covered: 4
Win probability: 4/38 = 10.53%
Lose probability: 34/38 = 89.47%

Payout: 8:1
Fair payout: (38/4) - 1 = 8.5:1

House edge: (8.5 - 8) / 8.5 = 5.26%

Available Corner Bets

Layout Positions

Standard corners include:

1-2-4-5    2-3-5-6
4-5-7-8    5-6-8-9
7-8-10-11  8-9-11-12
10-11-13-14 ... and so on

Each four-number square on the layout
Total: 22 possible corners
(Some layouts show 23 with 0-1-2-3)

Zero Corners (European)

0-1-2-3: Special corner near zero
Pays 8:1 if any of these hit

On some layouts:
Chip placement between 0 and the row
Covers these four numbers

American Special

0-00-1-2-3: "Basket" or "First Five"
This is NOT a corner bet
It's a separate 5-number bet
Pays 6:1 (worst bet on the table)
House edge: 7.89%

Don't confuse with corner bets

Expected Value Analysis

European Corner Bet

$10 bet calculation:

Win: 4/37 chance × $80 profit = $8.65
Lose: 33/37 chance × $10 loss = $8.92

Net EV: $8.65 - $8.92 = -$0.27

House edge: $0.27 / $10 = 2.70%
Same as all European roulette bets

American Corner Bet

$10 bet calculation:

Win: 4/38 chance × $80 profit = $8.42
Lose: 34/38 chance × $10 loss = $8.95

Net EV: $8.42 - $8.95 = -$0.53

House edge: $0.53 / $10 = 5.26%
Same as most American roulette bets

Corner Bet vs Other Inside Bets

Comparison Table

Bet Type      | Numbers | Payout | Probability | House Edge
--------------|---------|--------|-------------|------------
Straight Up   | 1       | 35:1   | 2.70%       | 2.70%
Split         | 2       | 17:1   | 5.41%       | 2.70%
Street        | 3       | 11:1   | 8.11%       | 2.70%
Corner        | 4       | 8:1    | 10.81%      | 2.70%
Six Line      | 6       | 5:1    | 16.22%      | 2.70%

(European roulette values)

Why Choose Corner Bets?

Pros:
- Good coverage (4 numbers)
- Reasonable payout (8:1)
- Same house edge as any bet
- Easy to place on layout

Cons:
- Lower payout than straight-up
- Less coverage than outside bets
- No advantage over other bets

Neutral: Personal preference

Real-World Examples

Example 1: Basic Corner Bet

Bet: $25 on corner 8-9-11-12

Outcome analysis:

If 8 hits: Win $200, keep $25 = $225 return
If 9 hits: Win $200, keep $25 = $225 return
If 11 hits: Win $200, keep $25 = $225 return
If 12 hits: Win $200, keep $25 = $225 return
If any other: Lose $25

Probability: 10.81%
Expected loss: $0.675 per spin

Example 2: Multiple Corner Strategy

Bet: $5 on each of 4 different corners ($20 total)

Coverage:

Corners: 1-2-4-5, 7-8-10-11, 19-20-22-23, 31-32-34-35
Numbers covered: 16 (no overlap)

Win probability: 16/37 = 43.24%
Win amount: $40 + $5 = $45, minus $15 other bets = $30 profit
Lose probability: 56.76%
Lose amount: $20

EV: (0.4324 × $30) - (0.5676 × $20) = $1.36 - $11.35 = -$0.54
House edge: Still 2.70% on total wagered

Example 3: Session Simulation

100 spins, $10 per corner bet:

Expected wins: 10.81 (call it 11)
Expected losses: 89.19 (call it 89)

Wins: 11 × $80 = $880
Losses: 89 × $10 = $890

Net: -$10 (1% loss)
Close to theoretical -2.70%

Variance makes sessions unpredictable
Long-term: house always wins

Example 4: Corner vs Straight Comparison

Same $40 budget, same area:

Option A: $10 each straight-up on 1, 2, 4, 5
Win on 1: $350 profit ($360 - $10 won - $30 lost)
Probability: 10.81% combined

Option B: $40 corner bet on 1-2-4-5
Win on any: $320 profit
Probability: 10.81% combined

Straight bets pay more per hit
Corner bet is simpler, same EV

Corner Bet Strategies

Coverage Strategy

Using corners for coverage:

6 corners = 24 numbers
$5 each = $30 total

Hit probability: 24/37 = 64.86%
Win: $40 - $25 other bets = $15 profit
Lose: $30 loss

EV: (0.6486 × $15) - (0.3514 × $30) = -$0.81
Still 2.70% edge on $30 wagered

Hot Number Approach

After 5 spins, notice pattern:
Numbers 4, 5, 7, 8 appeared often

Place corner on 4-5-7-8?

Reality: Past spins don't affect future
Each spin is independent
"Hot" corners are illusion

Sector Betting

Cover section of wheel:

Wheel sector containing 29-7-28-12:
Numbers not adjacent on layout
Requires multiple bets

Layout sector (adjacent numbers):
Single corner covers that area
Simple but arbitrary

Common Mistakes

1. Thinking Corners Are "Safer"

Mistake: More numbers = better odds Problem: House edge same for all bets Fix: Choose based on preference, not false security

2. Chasing with More Corners

Mistake: After losses, add more corners Problem: Just betting more, same edge Fix: Bet within budget regardless

3. Overlapping Corners

Mistake: Bet corners that share numbers Problem: If shared number hits, only one pays Fix: If overlapping, use straights or splits

4. Ignoring Table Type

Mistake: Play American when European available Problem: Double the house edge Fix: Always prefer European roulette

Frequently Asked Questions

Is the corner bet a good roulette bet?

It's as good as any other bet on a European wheel—all have 2.70% house edge. Choose based on coverage preference.

How many corners should I bet?

Depends on coverage desire and bankroll. More corners = more coverage but same percentage edge.

Can I beat roulette with corner bets?

No. No betting strategy overcomes the house edge. Corner bets lose 2.70% long-term like all bets.

What's the best corner to bet?

All corners have identical probability and payout. No corner is mathematically better than another.

Should I bet the same corner repeatedly?

Makes no difference. Each spin is independent. Personal preference only.

Is corner better than split or street?

Same house edge. Corner covers 4 at 8:1, split covers 2 at 17:1. Choose your coverage preference.

Pro Tips

• European only: Half the house edge of American

• Set loss limits: Same 2.70% edge eventually wins

• Single corner is fine: Multiple corners just add action

• Avoid zero corner confusion: Know what you're betting

• Entertainment mindset: No corner strategy beats the house

Related Calculators

• Roulette Odds Calculator - All bet types
• Roulette Single Number Calculator - Straight-up bets
• Roulette Expected Value Calculator - EV analysis
• Roulette Split Bet Calculator - Two-number bets
• House Edge Calculator - Compare games

Conclusion

Corner bets cover four adjacent numbers at 8:1 payout—a balanced inside bet offering decent coverage without sacrificing too much payout potential. Our calculator shows exact probability and expected value for any corner bet scenario.

Calculate Corner Bet Odds Now →

The 8:1 payout on 10.81% probability yields the same 2.70% house edge as every other European roulette bet. Our calculator confirms that corner bets are neither better nor worse than alternatives—just a different way to cover numbers on the layout.