Affect vs Effect: Which One Do You Need?
Affect is almost always a verb. Effect is almost always a noun.
The rain affected the match. The rain had an effect on the match.
The test that settles it
Put the in front of the word. If the sentence still works, you want effect — because only a noun takes the.
“The new rule had an ___ on attendance.” → the effect works, so it is effect.
“The new rule ___ attendance.” → the affect is nonsense, so it is affects.
If you prefer a word to hang it on, RAVEN: Remember, Affect is the Verb, Effect is the Noun.
Affect: the verb
To affect something is to change it, act on it, or make a difference to it. It takes an object — something has to be affected.
The strike affected deliveries across the region.
Rising costs are affecting small businesses first.
Nothing he said affected her decision.
Swap in influenced or changed. If the sentence still means what you meant, affect is right.
Effect: the noun
An effect is the change that results. Because it is a noun, it sits behind an, the, this, or an adjective.
The strike had a serious effect on deliveries.
The medicine took effect within an hour.
We are still measuring the effects of the change.
Swap in result or outcome. If it still reads, effect is right.
Side by side
| Affect | Effect |
|---|---|
| Verb — something does it | Noun — something has it |
| Follows a subject: it affects… | Follows an article: an effect… |
| Swaps with influence | Swaps with result |
| The delay affected the schedule. | The delay had an effect on the schedule. |
The two exceptions
Both words cross over, but rarely, and in ways you can recognise.
To effect something is to bring it about. It appears mostly in formal writing, and almost always beside change, reform or a settlement.
The committee hoped to effect real change.
Note the difference: affect change means to influence a change already happening; effect change means to cause it.
In psychology, affect (stressed on the first syllable, AF-fect) means visible emotion.
The patient presented with flat affect.
Outside clinical writing you will not need it.
Where people get it wrong
| Incorrect | Correct | Why |
|---|---|---|
| The weather effected our plans. | The weather affected our plans. | The weather did something, so it needs the verb. |
| It had a positive affect on morale. | It had a positive effect on morale. | A positive ___ — an article and an adjective mean a noun follows. |
| The changes will effect everyone. | The changes will affect everyone. | The changes will influence people, not bring them into being. |
| Side affects | Side effects | They are results, so the noun. |
Practice — choose affect or effect, then check yourself.
- The new timetable will ___ every department.
- Cutting sugar had an immediate ___ on his energy.
- She wanted to ___ change from within the organisation.
- Loud noise ___ concentration more than most people realise.
- The drug’s side ___ are listed on the packet.
- His mood was not ___ by the news.
Show the answers
1. affect 2. effect 3. effect (the rare verb — to bring change about) 4. affects 5. effects 6. affected
Frequently asked
Is it “affect change” or “effect change”?
Effect change, if you mean to bring it about. Affect change is possible but says something different — that you influenced a change already under way. Most writers mean the first.
Which one is “affective”?
Affective means relating to emotion, and belongs with the psychology sense. The everyday word is effective, meaning it works.
Do they sound the same?
Close, but not identical. In careful speech affect starts with a weak “uh” and effect with a short “ih”. In ordinary speech the two collapse together, which is why the mistake is so common in writing.
More words people confuse
