Guess the Odds
Guess the Odds
About Guess the Odds
How the answer is produced
Each question is a situation the tool can actually carry out. You lock in a percentage first, and only then does it run that situation a thousand times with secure browser randomness: dealing 23 birthdays, tossing until five heads appear, picking doors, counting runs, chasing six faces. The bar you watch is the share of those thousand rounds where the thing happened. Because it is measured rather than looked up, the number lands slightly differently every time, and that is the point.
When to open it
Someone tells you 23 people are enough for a shared birthday and you do not believe it. A friend insists the coin is due for tails. An argument about whether switching doors really helps has gone on too long. Open this, both of you lock in a number, and let a thousand rounds settle it in about a minute. It also works alone, as a quick check on how well your sense of chance actually tracks.
What it does not do
It measures five fixed situations and nothing else: you cannot enter your own question, and the result says nothing about your intelligence, your luck or anything you are about to do. A thousand rounds is a sample, not a proof, so the measured share wobbles by a point or two between plays. Nothing is saved, no account is involved, and the tool never gives advice about money, betting or real-world decisions.
FAQ
Common questions and answers about this topic.
How do I play Guess the Odds?
Read the situation, drag the slider to the percentage you believe, and press Lock in my answer. The tool then runs that situation a thousand times and shows the measured share next to your bet. Five questions make one round, and a title sums up how close you were.
Is it really true that 23 people are enough for a shared birthday?
Run the first question and see for yourself. The measured share lands near half, because the question is about any two people rather than someone matching you specifically, and 23 people already make 253 possible pairs.
After five heads in a row, is tails more likely next?
No, and the second question measures exactly that. The tool tosses until five heads appear and then tosses once more, a thousand times over, and that final toss stays close to an even split. The coin has no memory of the run before it.
Why is the measured number slightly different each time?
Because it is measured, not looked up. A thousand rounds is a large sample but still a sample, so the share typically moves by a point or two between plays. That wobble is honest: it is what real sampling looks like.
Does the title say anything about me?
No. It only summarises how far your five bets landed from the five measured shares in this round. It is not a test of intelligence, numeracy or luck, and nothing is stored between rounds.
Is any of my data saved?
No. Your bets and results live only in the open page, with no account, no history and nothing sent anywhere. Reload and the round starts over from the first question.