To understand Bentham's moral philosophy we need to grasp three things: first, he thought pleasure was the only intrinsic good, and pain the only intrinsic evil, secondly, he thought pleasure could be measured by the felicific or hedonic calculus (two words for the same thing).  Finally, Bentham believed all of us were equal, so no-one was to count for any more in the calculus – your hedon and mine were the same objective measure (like  weight in kilograms).

Bentham argues in Principles of Morals and Legislation that pleasure can be quantified – given a number (say in utils or hedons of pleasure) and then added up to find the maximum pleasure 1. for a person and 2. for a community of any decision.  He is a consequentialist, but sees the key idea or intrinisic goodas pleasure alone. The seven dimesnions of pleasure can be summed up by an acronym P.P.R.I.C.E.D. (propinquity, purity, reproducability, intensity, certainty, extent, durability).

The major factors of sensations of pleasure and pain resulting from an action as outlined by Bentham are summarized by these variables.

The first four variables (intensity, duration, certainty, and propinquity) show the value of the pleasure or the pain "considered by itself." This phrase implies Bentham did not see pleasure and pain as polar concepts or contraries.

The next two variables (fecundity and purity) are properties of the event or action produced by the pleasure or pain-—not properties of the pleasure or pain, itself.

Intensity (I)–How intense is the pleasure or pain?

Duration (D)–How long does the pleasure of pain last?

Certainty (C)–What is the probability that the pleasure or pain will occur?

Propinquity (nearness or remoteness) (N)–How far off in the future is the pleasure or pain?

Fecundity (F)–What is the probability that the pleasure will lead to other pleasures?

Purity (P)–What is the probability that the pain will lead to other pains?

Extent (E)–How many persons are affected by the pleasure?