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Roulette win calculator: what a bet pays, in pounds
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Working out a roulette win is one multiplication: stake times the payout ratio. The complications come when several bets are on the table at once, because the winning bet pays while the others lose, and what lands in the balance is not what the payout table suggests. Here is the arithmetic for single bets and for a full layout.
Single bets
Winnings = stake × payout. Total return = winnings + stake.
| Bet | Stake | Payout | Winnings | Returned |
|---|---|---|---|---|
| Red | £10 | 1:1 | £10 | £20 |
| First dozen | £10 | 2:1 | £20 | £30 |
| Corner | £10 | 8:1 | £80 | £90 |
| Split | £10 | 17:1 | £170 | £180 |
| Number 17 | £10 | 35:1 | £350 | £360 |
The "returned" figure is what you see arrive in the balance. The "winnings" figure is how much better off you are.
Stacked chips
Five 20p chips on one number is a £1 bet and pays £35 if it hits, plus the £1 back. Chips stack; the payout ratio does not change with the number of chips, only the stake does.
Put it into practice
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Several bets at once
Suppose the layout has £5 on red, £5 on the second dozen and £1 on number 17, total £11 staked. The ball lands on 17, which is black and in the second dozen.
- Red: loses, £5 gone.
- Second dozen: wins, £10 winnings + £5 back = £15 returned.
- Number 17: wins, £35 winnings + £1 back = £36 returned.
Returned to balance: £51. Staked: £11. Net gain on the spin: £40. The same layout on a spin that lands on 3 (red, first dozen) returns £10 (red wins, the dozen and the number lose) and is £1 down net. On a zero, everything is lost: £11 down.
A full-layout example
A common live-table habit: £1 on each of 20 numbers. Staked £20. On a hit, one number pays £35 and returns £36; the other 19 chips are lost. Net on a winning spin: £36 − £20 = £16. Net on a losing spin: −£20. You win roughly 54% of spins and lose 46%, and the average per spin is −£0.54, which is 2.70% of £20. Covering more numbers raises the hit rate and lowers the net on each hit by exactly enough to keep the edge where it was.
Multiplier tables
On a lightning-style table the £1 on 17 would return £30 (29:1 plus stake) if 17 was not struck, and £51 to £501 if it was, depending on the multiplier. Every other line in the examples above is unchanged. If you bet numbers on those tables, redo the arithmetic with 29 in place of 35 for the ordinary spins.
Working backwards: stake for a target
To win £100 from one bet: £100 on red, £50 on a dozen, £12.50 on a corner, £5.89 on a split, £2.86 on a number. The required stake shrinks as the payout grows, and the chance of needing to place it more than once grows faster. There is no combination that gets to £100 more cheaply on average than any other; the edge sees to that.
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Short answers
How much does £10 on red win?
£10 in winnings, plus your £10 stake back, so £20 returns to the balance. You are £10 better off than before the spin.
How much does £2 on a single number win?
£70 in winnings at 35 to 1, plus the £2 stake back, so £72 returns. Net gain on the spin is £70.
If I bet on several things and one wins, do I lose the others?
Yes. Each bet settles separately. Winning bets pay at their odds and return their stake; losing bets are gone. Your net result is the winnings minus the losing stakes.