What is utilitarianism?
Utilitarianism is a way of deciding what is right. It looks only at the results of an action. The word comes from utility, which means usefulness.
The idea is short. Choose the action that brings the most happiness (and the least suffering) to everyone it touches. Everyone counts the same: a king and a farmer, you and a stranger.
Philosophers call this a consequentialist view: an act is right or wrong because of its consequences (results), not because of a rule or the person's intention.
Jeremy Bentham: counting pleasure
Jeremy Bentham (England, about 1800) said that people are ruled by two masters: pleasure and pain. So a good law is one that makes the most pleasure and the least pain.
He wanted to measure it. He asked how strong a pleasure is, how long it lasts, how likely it is, and how many people feel it. Then you add up. This is the "add the blocks" idea in our 3D.
Critics said: a pleasure is a pleasure for Bentham, even a silly one. That felt too low to many people.
John Stuart Mill: quality as well as amount
John Stuart Mill (England, 1806-1873) was a follower of Bentham, but he changed the idea. He said some pleasures are higher (learning, friendship, art, helping others) and some are lower (only eating, only sleeping). A little higher pleasure can be worth more than a lot of the lower kind.
His famous line, in simple words: it is better to be an unhappy thinking person than a happy fool. He said people who have tried both kinds usually prefer the higher kind.
Mill's greatest happiness principle: actions are right when they tend to increase happiness, and wrong when they tend to produce the opposite.
Act and rule utilitarianism
Act utilitarianism checks each single act: "Which act now gives the best total?"
Rule utilitarianism asks: "Which rule, if everybody followed it, gives the best total?" For example, a rule like "keep promises" gives more happiness in the long run than "break a promise when it helps", because trust is useful.
Rule utilitarianism answers a common doubt: it stops us from doing something cruel just because the numbers look good once.
Mill's freedom: the harm principle
In the book On Liberty (1859) Mill asks how far a government or society may control a person. His answer is the harm principle: the only good reason to limit a person's freedom against their will is to stop harm to other people.
So you are free to believe, speak, choose your work, and join groups, as long as you do not harm others. Society may not stop you only because it thinks you are wrong, or for your own good. Mill defended three freedoms: freedom of thought and speech, freedom to act on your own plans, and freedom to join with others.
Why does a utilitarian care about freedom? Mill thought that when people are free to try different ways of living, society learns what really makes people happy. Freedom is useful.
Strong points and weak points
Strong: it is simple, it treats everyone equally, and it works for big choices like laws and hospitals.
Weak: (1) It is hard to measure happiness. (2) It might allow hurting a few people if many gain. (3) We cannot know all the results in advance. Rules, rights and Mill's harm principle try to answer these doubts.
Key formulas and definitions
- Utilitarian test: total = (all the good) โ (all the harm), for everyone affected
- Greatest happiness principle: right = tends to increase happiness; wrong = tends to cause the opposite
- Harm principle: limit a person's freedom only to prevent harm to others
- Key terms: consequentialism, utility, higher and lower pleasures, act and rule utilitarianism, On Liberty
Worked examples
1. Action A gives +3, +2, +2, -1, -2 to five people. Action B gives +1 to each. Which action does utilitarianism choose?
A: 3+2+2-1-2 = +4. B: 1+1+1+1+1 = +5. B has the bigger total, so utilitarianism chooses B.
2. A class can watch film X (4 students enjoy it a lot: +3 each; 6 are bored: -1 each) or film Y (everyone gets +1). Which is better by total?
X: 4 ร 3 โ 6 ร 1 = 12 โ 6 = +6. Y: 10 ร 1 = +10. Y has the higher total, so Y is the utilitarian choice.
3. A person wants to wear a very loud shirt that some people dislike but it harms nobody. Can society stop them, by Mill's harm principle?
No. Dislike is not harm. The shirt does not injure anyone's body, property or rights, so society should not limit the person's freedom.
4. A factory pours waste into a river and makes the village downstream ill. Does the harm principle allow the law to stop the factory?
Yes. The factory harms other people (their health), so limiting the factory's freedom is justified.
Common mistakes
- Thinking utilitarianism means "whatever makes me happy". It counts everyone's happiness equally, not only yours.
- Saying Mill and Bentham are the same. Bentham counted amount of pleasure; Mill added quality (higher and lower pleasures).
- Confusing "harm" with "offence". In the harm principle, harm means real damage to others, not just that they dislike something.
- Forgetting that utilitarianism judges by results, not by good intentions.