I'm Fine
A very common, slightly more casual way to say 'All good' or 'Everything's fine'.
Use this when you're feeling 'Very well' or 'Great', a step above just being 'fine'.
Means 'More or less' or 'So-so'. Use this when you're not feeling great, but not bad either.
A polite and complete response, adding 'thanks' to the basic phrase. Recommended in most situations.
-How are you? -I'm fine, and you?
-Hi, Carlos, what's up? -All good!
Don't worry about me, I'm fine.
-How are you feeling today? -So-so, a little tired.
'Estoy bien' and 'Todo bien' are universally understood and used everywhere.
You might hear 'Ahí vamos' (ah-EE VAH-mohs), which means 'We're getting by' or 'Hanging in there'.
'Todo tranquilo' (TOE-doh tran-KEE-loh), meaning 'Everything's calm/cool', is a very common response.
It's common to hear 'Bien, por dicha' or 'Bien, afortunadamente', which adds the meaning of 'Fine, thankfully'.
While 'Estoy bien' is standard, a very common colloquial phrase for 'so-so' is 'Voy tirando', which literally means 'I go on pulling' but is used to mean 'I'm getting by'.
WRONG: 'Soy bien'. The verb 'ser' (soy) is for permanent characteristics (I am tall, I am a doctor). Use 'estar' (estoy) for temporary states and conditions, like how you are feeling right now. CORRECT: 'Estoy bien'.
WRONG: 'Yo soy fino'. This is a literal translation that doesn't work. 'Fino' or 'fina' means 'fine' in the sense of delicate, elegant, or high-quality, not 'well'. It will sound very strange to a native speaker.
PRONUNCIATION: Pronouncing 'bien' like the English word 'bean'. The Spanish 'ie' is a diphthong, a quick two-vowel sound. Say 'bee-EN', gliding from the 'ee' sound to the 'en' sound.