Casino probability, made visible

A better feel for chance.

Small, transparent experiments in casino mathematics. Change an assumption. See exactly what changes with it.

Independent trials1 − (1 − p)ⁿProbability of at least one occurrence

Explore the subject

At least one: the probability lab

Probability per trial (%)Independent trials

Educational model: a constant probability and independent trials. No real-money play.

2 articles

Probability notebook

The complement rule explains repeated chances without giving the next event a memory.

Reading the maths

Expected value describes a mathematical average. It does not describe the money a particular person will finish with.