Work out everyday probabilities
Probability is unintuitive, which is why gambling and games fool people. This calculator works out the odds for common cases — dice rolls, coin tosses, and drawing cards — so you can see the real chance of an outcome rather than relying on a gut feeling that's often wrong.
How to use it
- Choose the scenario: dice, coins, or cards.
- Set the specifics of the event.
- Read the probability of the outcome.
Where it helps
- Understanding the odds in a dice or card game.
- Checking the chance of a run of coin tosses.
- Building intuition for how probability actually behaves.
Questions people ask
Are past results "due" to change? No — independent events like coin tosses have no memory; each flip is 50/50 regardless of what came before. That belief is the gambler's fallacy.
Is my input stored? No — the calculation runs in your browser.