Kantian deontology versus Utilitarianism
Both count every person equally. Utilitarianism judges an act by its results. Kant holds that some duties bind whatever the results, and that an act has moral worth only when done from duty.
What they share
Both treat every person as counting. Utilitarianism counts everyone's happiness the same, so that one person's good counts for no more than anyone else's. Kant tells us to treat humanity, in ourselves and in anyone else, always as an end and never merely as a means.
Where they differ
- What makes an act right. For utilitarianism the moral quality of an act is a function of its consequences: one ought to maximise the overall good. For Kant an action has moral worth only if it expresses a good will, one moved by duty. The worth of a good will does not lie in what it achieves.
- Duties without exceptions. Kant's categorical imperatives apply unconditionally, whatever ends a person has, and he gives a test: act only on a rule you could will to be a universal law. Utilitarianism has no such fixed duties, so an act that normally looks wrong can be approved if it produces more good than not. Critics press this point for punishing the innocent and for ignoring rights and justice.
- How to decide. A utilitarian calculates the effects of an act, law or policy from an impartial standpoint. A Kantian asks whether the rule behind the act could be a law for everyone, and whether it treats people as ends.
A question that separates them
- Results or rules? “What matters is the result: do whatever does the most good overall” against “Some things are wrong whatever the result, and some duties bind no matter what”.
- A promise. “It is right to break a promise if breaking it does more good for more people” against “A promise binds even when breaking it would do more good”.
The promise is an imagined example. It shows the split, not a case that either side has settled in print.
Written by epchē in our own words, and checked against independent sources on 8 October 2026. The sources are listed below.
Read each on its own
Sources we used
- Kant's Moral Philosophy · Stanford Encyclopedia of Philosophy, read on 8 October 2026
- Immanuel Kant: Moral Philosophy · Internet Encyclopedia of Philosophy, read on 8 October 2026
- The History of Utilitarianism · Stanford Encyclopedia of Philosophy, read on 8 October 2026
- Act and Rule Utilitarianism · Internet Encyclopedia of Philosophy, read on 8 October 2026