Roulette is one of the best-known casino games, and placing chips on red or black is as straightforward as it gets. But what actually happens if both colours are backed at the same time?
This blog post explains what betting on red and black together means, how payouts are handled, and how the odds and house edge fit in. It also shows how the zero (and double zero) changes outcomes, with clear examples and a look at how this plays out at live tables and online.
If you choose to play, set limits that suit you and only use money you can afford to lose.

Betting on red and black together means placing one wager on red and another on black for the same spin. With equal stakes, this covers every non-green number on the wheel.
If the ball lands on a red number, the red bet wins and the black bet loses. If it lands on black, the reverse happens. Neither outcome includes the green pocket or pockets, so a result of zero (and double zero on American wheels) causes both colour bets to lose.
Because of those green pockets, betting both colours does not remove risk. It simply means that most spins return you to even when a colour hits. So how are payouts handled when both colours are backed?
Each colour bet is settled on its own. Colour bets pay 1:1, so a winning £5 bet returns the £5 stake plus £5 in winnings.
With £5 on red and £5 on black:
If the stakes are not equal, the net result reflects the difference between them when a colour hits. For example, £8 on red and £5 on black would lead to a £3 net gain if red wins, and a £13 loss if green appears.
Colour bets are even-money wagers, paying 1:1.
On a European wheel, there are 18 red numbers, 18 black numbers, and a single green zero. That gives red or black a probability of 18 out of 37, or about 48.6% per spin.
On an American wheel, there are 18 red, 18 black, plus zero and double zero, so red or black is 18 out of 38, or roughly 47.4% per spin.
These green pockets create the house edge: about 2.7% on European roulette and around 5.3% on American roulette. With those numbers in mind, does backing both colours change anything?
Not really. With equal stakes on both colours, most spins where a colour lands simply bring you back to even. The issue is the green pocket or pockets. When green appears, both colour bets lose at the same time, which is where the house edge is realised over repeated spins.
No staking pattern removes that edge or changes the underlying probabilities. Spins are independent, so previous results do not influence what comes next.
Players can back both colours at a live table or online, and the layout makes it clear where each wager sits. The feel is different in each setting, but the bet itself is the same.
On the table layout, red and black have their own marked areas. Players put separate stacks of chips on each colour before the dealer calls no more bets. After the ball drops, the dealer settles the winning colour at 1:1 and removes losing chips.
The net result reflects what landed: even when a colour wins, or a full loss if green appears.
Online roulette mirrors the same layout. Players choose a chip value and place chips on both the red and black areas on screen. Once the spin completes, the software pays the winning colour bet and removes the other.
Balances update automatically, showing any even outcome on a colour hit or a loss if the result is green. Keep stakes within personal limits and take breaks so play stays manageable.
Zero, and double zero on American wheels, are green and do not belong to either colour. Any spin landing on green causes both colour bets to lose, even when they are placed together.
This is the whole reason the house has an advantage on even-money bets. Because the colours do not cover every possible number, occasional green results lead to a steady edge for the casino.
From here, it helps to see how casinos treat these two separate wagers when they arrive together.
Casinos treat each colour bet as an individual wager. Backing both is permitted on standard roulette layouts, and there is no special rule attached to the combination.
When the result is a colour, the winning side pays 1:1 and the losing side is collected. If the result is green, both colour bets are removed. Usual table limits apply.
To help illustrate how betting on both red and black works in roulette, here are some basic scenarios:
If gambling starts to affect your well-being or your finances, seek support early. Independent organisations such as GamCare and GambleAware provide free, confidential help.
**The information provided in this blog is intended for educational purposes and should not be construed as betting advice or a guarantee of success. Always gamble responsibly.