Full Idea
Moore takes it that to call an action right is simply to say that of the available alternative actions it is the one which does or did as a matter of fact produce the most good. Moore is thus a utilitarian.
Gist of Idea
Since Moore thinks the right action produces the most good, he is a utilitarian
Source
Alasdair MacIntyre (After Virtue: a Study in Moral Theory [1981], Ch. 2)
Book Reference
MacIntyre,Alasdair: 'After Virtue: a Study in Moral Theory' [Duckworth 1982], p.14
A Reaction
Far be it from me to disagree with MacIntyre on this, but I would have thought that this made him a consequentialist, rather than a utilitarian. Moore doesn't remotely think that pure pleasure or happiness is the good. He's closer to Rashdall (Idea 6673).
Related Idea
Idea 6673 Ideal Utilitarianism is teleological but non-hedonistic; the aim is an ideal end, which includes pleasure [Rashdall]