Abstract: Disclosed is a modular stochastic machine capable of carrying out probability calculations and including: at least one stochastic distribution module corresponding to a plurality of random variables and capable of receiving an input of values of specified variables in order to return, as output, a representation of the distribution of at least one non-specified variable determined by the values of the specified variables; and at least two stochastic variable modules each corresponding to a single random variable and including: both a stochastic multiplier capable of receiving, as input, representations of distributions in order to return, as output, a representation of the product distribution, as well as a stochastic proportional normalizer capable of receiving, as input, a representation of a distribution in order to return, as output, a proportionally normalized representation.