Double 10: one number, doubling after 10 misses.
Double 10 is a roulette system for one particular number. You start with a small bet and double it only after every ten unsuccessful spins. That makes it feel slower and calmer than Martingale — but it still runs into the same problem: a single number may come quickly, or stay away for hundreds of spins.
Test Double 10 on both a short and a long sample
Set the bankroll, the base unit and your chosen number. The close-up mode over 1,000 spins shows the waves of the system clearly; a long test over 25,000 spins reveals what a truly long wait for the number does to the curve.
Bankroll and spins
Number and wheel
The choice of number has no effect on the result — every number has the same 1/37 chance (or 1/38). Only chance and the progression matter.
The bet is held for a whole ten-spin block; after a hit the system returns to the base unit. Every run uses a fresh random sequence of spins.
Bankroll over time
Double 10 creates waves: the bankroll drifts down between hits and jumps when the number lands. Watch the depth of the valleys between hits.
What happened in the simulation: Click "Run the simulation" and you will get a short, plain-language explanation of the result here.
Why Double 10 grows slowly and yet just as steeply in the end
Doubling after 10 misses looks tame. But the blocks add up — and the tenth costs 512 times what the first did. The steps are longer than Martingale’s, but they lead in the same direction.
How the bet grows across blocks without a hit
With a $100 base unit you are already playing the fifth block (spins 41–50) at $1,600 a spin. If the number stays away for 90 spins, the tenth block costs $51,200 on a single spin.
A table for a $100 unit
How many spins without a hit can your bankroll fund?
This calculator is not about whether the number lands. It is about how many whole ten-spin blocks you can pay for — and how likely it is you lose them all.
Enter a bankroll and a base unit. The result shows how many whole ten-spin blocks you can still afford and roughly how likely it is that your number never lands in that time.
Is Double 10 a good roulette system?
Excellent for understanding the variance of single-number bets, poor as a long-term plan for profit. Here is the whole picture, maths and practice, in one place.
Double 10 is a strategy built on betting one particular number. The name comes from doubling the bet only after ten unsuccessful spins. So it is not a classic Martingale, which raises after every loss — Double 10 is slower and at first glance less aggressive, but it still uses the same principle of chasing losses with a larger bet.
What is the Double 10 system in roulette?
In practice you choose a number — 17, say — and start betting one unit. If it fails to land ten times in a row, you play the next block of ten spins at two units. After another ten misses you move to four units, then eight, and so on. Once the number lands, the run ends, you take the 35:1 payout and start again from the base bet.
Put simply: Double 10 is a slow Martingale on one number. You do not raise your stake after every loss but only after ten failed attempts. That is exactly why the system feels calm — and exactly why its risk is less visible.
The rules of the Double 10 system
The basic rules are very simple. You choose one number and bet the base unit on it. If it does not land within the first ten spins, you double the bet. If it does not land in the next ten either, you double again. Once your number hits, the system resets to the base unit.
The original test had to impose a limit on run length — 100 spins, for instance — because with an unlimited progression the figures began to scatter extremely. That matters for real play too: without a limit the system can demand very large bets; with one, you must occasionally accept closing a run at a loss.
What did the long-run tests of Double 10 show?
Over the medium term the system moved in waves and could hover around zero for a while. Over shorter stretches, rising sections of the curve even appeared — exactly the kind that convince a player the system “works”. But extending the test to around 100,000 spins let the losing runs prevail, and the system gradually went below zero.
A progression of runs was tested as well, raising the base unit by 1 after every unsuccessful hundred-spin run. The result began to resemble Martingale: the curve could climb, but large local drawdowns appeared and the bets moved beyond reasonable control. The conclusion is the same as with other progressions — chasing losses more aggressively does not change the mathematics, it only widens the swings.
The biggest risks of the Double 10 system
The main risk is the variance in the intervals between hits on one number. A player may feel the number “has to come”, but roulette does not remember previous spins. Every spin is a fresh attempt with the same 1/37 probability.
The second risk is the false sense of slow growth. Because the bet only rises after ten spins, the system does not feel dangerous at first. But during a long run without a hit the bets grow steadily, and one unfavourable stretch can erase a great deal of earlier work.
The third risk is limits. Impose a maximum run length and you will occasionally accept a large loss. Impose none and you theoretically need a very large bankroll and a very high table limit. There is no safe combination — only different ways of distributing the risk.
How to read the Double 10 bankroll chart
The Double 10 curve looks different from that of a colour system. Between hits the bankroll declines steadily — you pay spin after spin and wait. When the number lands, the curve leaps upward thanks to the 35:1 payout. The result is a sharp saw-toothed wave: long slow valleys and short steep peaks.
That is why the simulator above has a toggle between the bankroll chart and the bet-size chart. The second view shows the stepped growth of the bets across blocks — the bankroll can look stable for a while, but the steps have meanwhile grown into amounts no ordinary player would accept. To compare it with other systems on identical spins, use the Roulette system tester.
The verdict: is the Double 10 system worth it?
Double 10 is an interesting system to learn from, because it shows the difference between a fast and a slow progression. It can be clear and intuitive for a player, but over time it does not solve roulette’s fundamental problem: the probability and the payout are not set in the player’s favour.
As a standalone long-term strategy Double 10 cannot be recommended. It can be useful for understanding the variance of single-number bets and for demonstrating why an average hit once in 37 spins does not amount to a safe plan.
The biggest misconceptions about Double 10
Single-number systems attract errors of their own — mostly around “overdue” numbers and the sense of safety a slow progression brings.
Even after 100 misses the chance on the next spin is still 1/37. Previous results say nothing about what lands next.
Doubling after 10 spins slows the growth of the bets but does not remove it. The tenth block costs 512 units a spin.
A number can land twice in five spins and then stay away for 150. The variance on a single number is extreme.
There are 37 numbers on the wheel, but the payout corresponds to 36. Every spin has an expected value of −2.70% of the bet, and no progression changes that.
Double 10 vs. other roulette systems
Double 10 belongs to the systems with a slow progression after a loss and high variance. Here it is alongside the systems it is most often compared with.
| System | Risk | Principle | Best for |
|---|---|---|---|
| Martingale | Very high | Doubling the bet after a loss | Understanding the risk of a progression |
| Fibonacci | High | A progression following the Fibonacci sequence | A slower progression after a loss |
| Labouchere | High | A cancellation line; the bet is first + last | More advanced players and experiments |
| Reverse Labouchere | High | The line grows on a win and is crossed off on a loss | Hunting streaks with a capped loss |
| Parlay | Medium | The win stays in play (let it ride) | Short runs after a win |
| Bally | Very high | 24 numbers with a 12–36–108–324 progression | Blanket bets with a harsh progression |
| Charlotte | High | A single-number progression over 88 spins | Hunting the 35:1 payout to a plan |
| Dominance | High | A double street following the dominant side of the table | Players who follow trends |
| Double 10 | High | One number, stepping up after 10 misses | Patient single-number hunters |
| FAST | High | 33 numbers, low and high units | Maximum table coverage |
| Havana | High | One dozen, two levels of units | Dozen players |
| Holy Grail | High | 18 distinct numbers with a progression | Covering half the wheel |
| John Wayne | High | A spread of 18 numbers for 10 units | Combined bets on numbers |
| Numeric Scanner | High | Repeating numbers with a progression | Players who love stats and tables |
| Seven Corners | Medium | Seven corner bets, 27–28 numbers flat | Blanket bets with no progression |
| System 300 | Very high | 34 of 37 numbers, a rare 300-unit loss | Understanding asymmetric risk |
| Five-number system | High | Five numbers, progression blocks of 1-6-11-16 | Hunting the 35:1 payout on a budget |
The name of a system takes you to its page with an interactive test — the current system is highlighted. Want to compare several systems on the exact same sequence of spins? Use the Roulette system tester.
Common questions about the Double 10 system
Is the Double 10 system profitable?
Not in the long run. It can have short positive periods, but the progression does not change the house edge. In long tests of around 100,000 spins the system gradually went below zero.
Why is the system called Double 10?
Because the player doubles the bet after every 10 unsuccessful spins on their number — not after every loss, as with Martingale.
Is Double 10 safer than Martingale?
The bets grow more slowly, so the system feels calmer. But the risk does not disappear; it merely moves into the long intervals without a hit. The tenth block already costs 512 units on a single spin.
What is Double 10 used on?
A bet on one particular number, paying 35:1. The hit chance is 1/37 on European roulette (≈ 2.70%) and 1/38 on American (≈ 2.63%).
What is the chance the number lands within one block of 10 spins?
On European roulette roughly 24%. So about three in four ten-spin blocks end without a hit — which is why moving up to higher blocks is entirely routine, not exceptional.
What bankroll do I need for Double 10?
It depends on the unit and how many blocks you want to fund. At a $100 base unit the first 6 full blocks (60 spins) cost $63,000 between them. Use the block calculator above.
Is Double 10 better on European or American roulette?
European is better: a hit chance of 1/37 rather than 1/38 at the same 35:1 payout. The house edge is 2.70% against 5.26% on American roulette.
Can I pick a “better” number?
No. On a fair wheel every number has exactly the same probability. “Hot” and “cold” numbers are merely statistical noise from past spins, and they say nothing about the future.
Does a run-length limit — 100 spins, say — help?
A limit prevents extreme bets but changes the mathematics of the system: occasionally you accept closing a run at a large loss that the next win may not cover. Without a limit you theoretically need an unlimited bankroll.
What did the run-progression variant show?
Raising the base unit by 1 after every unsuccessful hundred-spin run made the result resemble Martingale: the curve could climb, but large local drawdowns appeared and the bets moved beyond reasonable control.
Related tools and systems
First understand the principle, then work out the risk — and test longer scenarios over thousands of spins.