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What Is La Partage and Why Does It Halve the Edge?

La Partage halves the single-zero roulette edge on even-money bets by turning zero from a full loss into a half loss.

Manit Kaushal Founder · Veena Games 7 min read

La Partage is the French roulette rule that gives back half of an even-money stake when the ball lands on zero. Under single-zero French roulette rules, that cuts the house edge on those bets from 2.7% before the rule to 1.4% after it, with both figures rounded.

The reason is small and exact. A single-zero wheel has 37 pockets. An even-money bet, such as red or black, covers 18 of them. Without a special zero rule, you win on 18 pockets and lose on 19, because zero is a loser. La Partage changes only that last pocket. Zero becomes a half loss, not a full loss.

The figures worth quoting are the figures you can check. The 1.4% number assumes a single-zero wheel, standard even-money bets, and La Partage applying only when zero lands. Change any of those rules and the edge changes with it. An edge quoted without its rules is wrong more often than right.

What does La Partage actually do to your bet on zero?

La Partage applies only after one event: you have made an even-money bet, and the ball lands on zero. Instead of losing the whole stake, you lose half. The other half is returned to you.

Take a £10 red bet. If the ball lands on a red number, you win £10 profit and keep your £10 stake. If it lands on black, you lose the £10 stake. If it lands on zero under La Partage, you lose £5 and get £5 back. The same treatment applies to the even-money outside bets: red or black, odd or even, 1 to 18 or 19 to 36.

The rule does not make zero favourable. Zero still costs you money. It just costs half as much on the bets the rule covers. That distinction matters, because the edge is not removed. It is reduced.

On a single-zero wheel there are 37 possible landing spots. An even-money bet covers 18 numbers and misses 18 opposite numbers, plus zero. Standard European-style single-zero roulette treats all 19 misses as full losses. That gives the casino an edge of 2.7% on those bets. La Partage turns the zero miss into a half loss, so the average loss is cut in half, to 1.4%.

The phrase la partage is French for sharing. In practice, the zero loss is shared between player and house. The house takes half the stake; the player keeps half.

Which French roulette rules does that figure assume?

Those assumptions are the whole point. “French roulette rules” can mean layout, wheel, call bets, table language, La Partage, the en prison rule, or some mixture of them. The house edge figure only belongs to the exact rule set above.

Why does La Partage cut the house edge to 1.4% on even-money bets?

Start with the wheel. A single-zero roulette wheel has 37 pockets. An even-money bet covers 18 winning pockets. The other 18 non-zero pockets lose, and zero is the extra pocket that gives the house its edge.

Without La Partage, a £1 red bet has this expectation: 18 results win £1, and 19 results lose £1. Add them up and you get 18 minus 19, which is minus £1 across 37 equally likely outcomes. That is an average loss of 1/37 of the stake, or 2.7%.

La Partage changes only the zero result. The 18 wins still win £1. The 18 opposite-colour results still lose £1. Zero now loses 50p, not £1. So the total is 18 minus 18 minus 0.5, which is minus £0.50 across 37 outcomes.

Minus £0.50 divided by 37 is minus 1/74 of the stake. As a percentage to one decimal, the expected loss is 1.4%. That is exactly half of the single-zero even-money edge before rounding, because the only remaining mathematical advantage is half of the zero pocket.

This is also why the rule is easy to overstate. La Partage does not improve your chance of winning the spin. Red still hits on 18 out of 37 pockets. It improves the result when the one special losing pocket appears. The probability is unchanged; the payout on zero is softened.

How is En Prison different, and why do people mix them up?

PointLa PartageEn Prison
What happens on zeroHalf the even-money stake is returned at once; the other half is lost.The even-money stake is held for the next spin under the en prison rule.
How the bet is settledThe zero result is settled immediately, so the player knows the loss.If the next spin wins, the original stake is usually returned with no profit; if it loses, the stake is lost.
Common house edge1.4% on even-money bets, assuming a single-zero wheel and standard La Partage.Also commonly 1.4% on even-money bets under the usual one-spin version.
Where rules varyVariation is mostly about whether the table offers the rule at all.Variation matters more: some tables differ on repeated zeros or how long a stake remains imprisoned.
Why players confuse themBoth are French roulette rules that reduce the cost of zero on even-money bets.Both trigger only on zero and often produce the same quoted edge, so casual explanations blur them.

The practical difference is timing. La Partage gives a definite half-stake refund immediately. En Prison delays the decision. You are not choosing a better percentage in the usual version; you are choosing a different treatment of the zero result.

Because en prison details can vary by table, the safest habit is to read the displayed rule. If the rule does not say what happens after a second zero, do not assume. The evidence on historic and online usage is uneven, and many summaries flatten the differences.

Which bets benefit, and which ones do not?

La Partage benefits the even-money bets only. These are the wagers where a normal win pays 1 to 1 and the bet covers 18 of the 37 pockets on a single-zero wheel.

Dozens and columns are a common trap in explanations. They look broad because they cover 12 numbers, but they are not even-money bets. They pay 2 to 1, and La Partage is not normally applied to them. The same goes for a straight-up number: zero is already just one of the available numbers, and the payout structure carries the edge.

If your aim is to play the lowest-edge roulette bet, the answer is narrow: use even-money bets on a single-zero French Roulette table with La Partage. If the table lacks La Partage or uses American double-zero rules, you are no longer looking at the same figure.

Frequently asked questions

Final thoughts

The useful thing about La Partage is not that it makes roulette generous. It does not. The useful thing is that it makes the price of a simple roulette bet unusually clear. On the right table, the cost of choosing red, black, odd, even, low, or high is 1.4% of stake in the long run.

That is still a negative expectation. A £10 stake does not “cost” exactly 14p on the next spin, because one spin is lumpy: you win £10, lose £10, or lose £5 on zero. Expected value is the average after the wheel has had enough chances to show its full shape. It is a pricing tool, not a prediction of the next result.

If a friend asked what to do with this information, I would say this: stop treating all roulette tables as interchangeable. Single zero beats double zero. La Partage on even-money bets beats single zero without it. Inside bets may be more dramatic, but they do not receive this discount. Once you know that, the choice becomes honest. You can still play the bet you enjoy, but you are no longer mistaking a worse price for the same game.

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