In short: in the Theravāda tradition, fully ordained monks keep 227 rules, the Pātimokkha, recited together every two weeks on the Uposatha day. Novices keep 10 precepts; lay people keep 5, or 8 on observance days.
A monk's morning · 5 vs 8 precepts
Questions people ask
How many precepts do Buddhist monks keep?
In the Theravāda tradition, a fully ordained monk (bhikkhu) keeps 227 Pātimokkha rules. Novices keep 10 precepts; lay people usually keep 5, or 8 on observance days.