European vs American Roulette: One Extra Zero Nearly Doubles the Price

European and American roulette are separated by one pocket.

The European wheel has numbers 1 to 36 plus a single zero.

The American wheel adds 00.

The standard payouts stay mostly the same. That extra outcome is enough to move the house edge from about 2.7% to about 5.26%.

It is a small visual change and a large mathematical one.

Straight-number bets

A single-number bet pays 35 to 1.

On a European wheel, the chance of winning is:

1 ÷ 37 = 2.70%

Fair profit odds would be 36 to 1 because there are 36 losing pockets for every winning pocket. The casino pays 35 to 1, creating the edge.

On an American wheel:

1 ÷ 38 = 2.63%

The payout remains 35 to 1 while there are now 37 losing pockets.

Even-money bets

Red, black, odd, even, high and low appear to be 50-50 choices.

On a European wheel, there are 18 winning numbers and 19 losing outcomes because zero belongs to neither side.

18 ÷ 37 = 48.65%

On an American wheel, zero and 00 both lose:

18 ÷ 38 = 47.37%

The green pockets are not neutral. They are the invoice.

House-edge calculation

Bet €1 on red in European roulette.

• Win €1 profit with probability 18/37
• Lose €1 with probability 19/37

Expected result:

(18/37 × €1) - (19/37 × €1) = -€0.027

Expected loss is about 2.7 cents per €1 wagered.

On American roulette:

(18/38 × €1) - (20/38 × €1) = -€0.0526

Expected loss is about 5.26 cents per €1.

Across €1,000 of turnover, the theoretical difference is roughly €25.60.

Inside and outside bets do not change the standard edge

A straight number, split, street, corner, dozen and red-black bet use different prize sizes, but on a standard wheel they normally share the same underlying house edge.

The payout is adjusted to match the number of covered pockets while leaving the zero advantage in place.

Betting on more numbers increases the chance of receiving a prize and reduces the size of that prize. It does not make the standard European wheel cheaper.

This is another place where feeling and mathematics separate. Outside bets feel calmer because they win more often. Inside bets feel dramatic because the payout is larger. The green pocket charges both groups at the same standard rate.

The five-number bet is worse

American roulette often includes a five-number bet covering 0, 00, 1, 2 and 3.

It typically pays 6 to 1.

The house edge is about 7.89%, making it one of the most expensive standard bets on the table.

It is a useful reminder that one game can contain several different prices.

French rules can improve even-money bets

Some European or French roulette tables use rules such as la partage or en prison.

Under la partage, half the stake on an even-money bet is returned when zero lands. This can reduce the house edge on those bets to about 1.35%.

Check the exact table rules. The wheel layout tells most of the story, but not all of it.

Do betting systems change the edge?

Martingale, Fibonacci and other staking systems change the pattern and size of bets. They do not remove the zero pockets or change the payouts.

A Martingale can produce many small wins followed by a rare large loss. Table limits and finite bankrolls eventually stop the doubling sequence.

Rearranging the stakes does not repair the wheel.

Does watching previous spins help?

In a properly functioning game, past random outcomes do not make a colour due.

Ten reds do not increase the probability of black on the next independent spin. Regulated random outcomes should be unpredictable and statistically appropriate. [1]

A physical wheel can theoretically develop bias through defects, but licensed casinos monitor equipment and online RNG roulette follows tested software requirements.

My verdict

Choose single-zero European roulette over double-zero American roulette when both are available under comparable rules.

The second zero adds no entertainment feature, no larger standard payout and no new strategic possibility. It simply gives the house another winning pocket.

Sometimes the most expensive part of a game is one character printed in green.