Is this coin flip game played for real money?

No. The table uses play chips that have no value, cannot be bought, and cannot be cashed out or exchanged for anything. If you run out, you are handed another stack for free. There is no account and nothing to download.

After several heads in a row, is tails more likely?

No. The coin has no memory, so the next flip is 50% heads and 50% tails whatever came before. Runs are also more ordinary than they feel: the chance that any 5 flips in a row all match is 6.25%, so they turn up regularly in any long session. Believing a face is due after a run is called the gambler's fallacy.

Is there a best time to cash out a streak?

No. Every cash-out point returns 99% of the bet on average, because the multiplier doubles exactly as fast as the chance of reaching it halves. Stopping after one correct call pays 1.98× 50% of the time. Stopping after 5 pays 31.68× 3.13% of the time. The average cost is the same, so only the swings change.

Does doubling the bet after a loss beat a coin flip?

No. Doubling after each loss wins a small amount often and loses a very large amount occasionally, and the two balance out to the same 1% of everything bet. Each flip costs 1% of its own stake on average whatever the flips before it did, so a staking plan changes the shape of the results and not their average.

Free Coin Flip

Heads or tails on a fair coin, with an optional streak that doubles on every correct call, played with chips that are worth nothing, with the odds of every streak printed beside the coin.

Play chips

1,000

No real money, no prizes, nothing to buy.

The coin

No round yet

Your call

Correct calls this round: 0; Single flip
Chance of the next call: 50%; Whatever came before
Multiplier: None yet; Exact, nothing rounded
Cash-out value: 0; On a bet of 10

Pick a bet, call heads or tails, then flip.

Streak mode

Session coach

Coach me as I play

Last round

Nothing played yet. After each of your rounds the coach says what the round cost and what decided it.

Decide the cost before you start

Gambling is entertainment with a price, like a concert ticket. The useful question is not how much you might win but how much the evening is allowed to cost. Pick that number first, and treat reaching it as the end of the session. You can set one below and the coach will hold you to it.

Next bet

10 chips at a 1% house edge: an expected cost of 0.1 chips.

This table is for practice and entertainment only. How to keep gambling safe

What a flip costs

Chance a call is right: 50%; Heads or tails, every flip
A correct call pays: 1.98×; Fair would be 2×
Expected cost of the round: 0.10 chips; 1% of a 10-chip bet
Average return, wherever you stop: 99%; The house keeps 1%

After any run of heads the next flip is still 50% heads and 50% tails. The coin has no memory, so no face is ever due and no call is better than the other. In streak mode the house takes its 1% once, on the bet, and every flip after the first is an even trade: the multiplier doubles and the chance of getting there halves.

The streak ladder: every cash-out point
Right in a row	Chance	Multiplier
1	50%	1.98×
2	25%	3.96×
3	12.5%	7.92×
4	6.25%	15.84×
5	3.13%	31.68×
6	1.56%	63.36×
7	1 in 128	126.72×
8	1 in 256	253.44×
9	1 in 512	506.88×
10	1 in 1,024	1,013.76×

Multiply any row's chance by its multiplier and you get exactly 99%. A single flip is the first row. See what doubling the bet after a miss does over a session

This session

Rounds played: 0
Chips bet: 0
Net chips: 0
Expected at a 1% edge: 0
Flips so far: 0; 0 heads, 0 tails
Longest run of one face: None yet

The longest run is a record of what the coin did, not a forecast of what it will do: the next flip is 50% either way. The expected figure is 1% of the chips you have bet on finished rounds, single flips and streaks alike. A short session can land far from it in either direction, and further the longer you let a streak run.

Built by Alexander Korsager · last updated October 3, 2026 · corrections

Chance a call is right, on every flip: 50%
What a correct call pays, where a fair bet would pay 2×: 1.98×
House edge, the gap between the two: 1%
Paid for 5 in a row, which happens 3.13% of the time: 31.68×

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A coin that shows the edge and the streak

A coin flip is the simplest bet there is, which makes it the clearest place to see two things.

The first is what a house edge looks like with nothing else in the way: a fair coin comes up your way 50% of the time, a fair bet on it would pay 2 for 1, and this table pays 1.98 for 1. That gap is the whole edge. On average 99% of each bet comes back and 1% stays with the house.

A fair coin, and what a correct call pays

Heads 50%
Tails 50%

A fair bet would pay2 for 1
This table pays1.98 for 1

The gap is the whole edge: 99% of each bet comes back on average and 1% stays with the house.

The second is what a streak is.

In streak mode each correct call doubles the cash-out value and a miss loses the bet, so 5 in a row pays 31.68×. It happens 3.13% of the time, and the two multiply to 99%, the same as a single flip. After any run of heads the next flip is still 50% heads. The table shows the longest run your session has really produced, as a record of what happened and nothing more.

Streak mode, every cash-out point

Correct in a row	Pays	Happens
1	1.98×	50%
2	3.96×	25%
3	7.92×	12.5%
4	15.84×	6.25%
5	31.68×	3.13%
6	63.36×	1.56%
7	126.72×	1 in 128
8	253.44×	1 in 256
9	506.88×	1 in 512
10	1,013.76×	1 in 1,024

Each step doubles the multiplier and halves the chance. Multiply any row's two figures and you get 99%.

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Rules at this table

Streak mode off
A round is
One flip
A correct call pays
1.98 for 1
A wrong call
Loses the bet
Returns on average
99%
Streak mode on
A round is
Up to 10 correct calls
Each further correct call
Doubles the multiplier
A wrong call
Loses the whole bet
Returns on average
99%
The same at every cash-out point, up to 1,013.76× at 10

Call heads or tails. The coin is fair: each face comes up 50% of the time on every flip.
Bets are 5, 10, 25, 100 chips. A correct call pays 1.98 for 1, the bet included. A wrong call loses the bet.
With streak mode off, every flip is a round of its own.
With streak mode on, a correct call keeps the round going. You may cash out for the bet times the current multiplier, or call the next flip. Each further correct call doubles the multiplier, and one miss loses the whole bet.
The multiplier runs 1.98×, 3.96×, 7.92× and on up to 1,013.76× at 10 correct calls, where the round cashes itself out.
You may change your call before any flip. It makes no difference to the odds.
Tab
Reach the call, the bet and the flip button
Space
Press the one in focus
Enter
Press the one in focus, flip the coin or cash out a streak

FAQ

Is this coin flip game played for real money?: No. The table uses play chips that have no value, cannot be bought, and cannot be cashed out or exchanged for anything. If you run out, you are handed another stack for free. There is no account and nothing to download.
After several heads in a row, is tails more likely?: No. The coin has no memory, so the next flip is 50% heads and 50% tails whatever came before. Runs are also more ordinary than they feel: the chance that any 5 flips in a row all match is 6.25%, so they turn up regularly in any long session. Believing a face is due after a run is called the gambler's fallacy.
Is there a best time to cash out a streak?: No. Every cash-out point returns 99% of the bet on average, because the multiplier doubles exactly as fast as the chance of reaching it halves. Stopping after one correct call pays 1.98× 50% of the time. Stopping after 5 pays 31.68× 3.13% of the time. The average cost is the same, so only the swings change.
Does doubling the bet after a loss beat a coin flip?: No. Doubling after each loss wins a small amount often and loses a very large amount occasionally, and the two balance out to the same 1% of everything bet. Each flip costs 1% of its own stake on average whatever the flips before it did, so a staking plan changes the shape of the results and not their average.

How this game works

Each flip is decided in your browser by one random number: the lower half of its range is heads and the upper half is tails. Your call does not enter into it, and nothing carries over from one flip to the next.

A correct call on a fair coin would fairly pay 2 for 1. This table pays 99% of that, 1.98 for 1, which is where the 1% house edge comes from. In streak mode the edge is taken once per round and not once per flip: n correct calls in a row pay 99% of 2 multiplied by itself n times, and happen once in that many rounds, so every streak length returns exactly 99%.

The test suite proves this by enumeration instead of by formula. For every streak length up to 10 it plays every possible sequence of flips through the same engine this page uses, with several patterns of calls, and adds up what was paid in whole hundredths of a chip. The total is exactly 99% of the chips bet every time. The martingale simulator shows why changing the bet from flip to flip does not change that.

There is no rounding at this table. Bets are whole chips and every multiplier is a whole number of hundredths, so each payout is exact and each multiplier prints in full. The expected cost of a round is 1% of its bet, which on a 100-chip bet is 1, whether the round is one flip or a streak.

The flips, heads and tails counts and longest run in the session panel are counted from the flips this session has actually made. They describe the past and predict nothing. The expected figure there is the edge multiplied by the chips you have bet on finished rounds.

Limits

This is one invented table with a 1% edge. It is not a copy of any real game. Real versions set their own edge, and some take it on every flip of a streak, so that longer streaks cost more.
A streak stops at 10 correct calls, a chance of 1 in 1,024, where it pays 1,013.76×. On a 100-chip bet that is 101,376 chips.
The coin is flipped with your browser's ordinary random number generator. This table does not publish seeds, so a flip cannot be verified after the fact the way a provably fair game can.
Rounds are fast. A real stake at this pace runs through far more bets per hour than a table game does, and the 1% is charged on each one.
Play chips do not feel like money. Cashing out a streak and stopping after a loss are both harder with a real stake.

This is a practice game for adults. It has no real-money play and links to none. A coin flip played with money keeps its edge on every bet, and no call, streak length or staking plan changes that: on this table each of them returns 99% on average and never more.

Gambling can cause serious harm. The National Problem Gambling Helpline is free, confidential and open 24/7, call or text 1-800-MY-RESET (1-800-697-3738), or chat at ncpgambling.org/chat.

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