Spanish Word Stress and Accents
Spanish is one of the most readable major languages in the world. Once you have two rules and a short list of exceptions, you can pick up any Spanish word, including ones you have never seen, and put the stress on the correct syllable almost every time.
This is the opposite of English, where a competent adult reader can encounter a brand-new written word and have no clue where the emphasis falls. In Spanish, the spelling itself tells you. The job of the acute accent (á, é, í, ó, ú) is to signal the exceptions to two stress defaults so the system stays predictable even for unusual words.
This page covers the two stress rules, when and why the accent mark appears, the homograph accents that change meaning rather than sound, the diaeresis on the ü, and the practical drills that turn the rules into instinct.
The two stress rules
Every Spanish word has exactly one stressed syllable. Where that stress falls is determined by the final letter of the word.
- Words ending in a vowel, the letter n, or the letter s are stressed on the second-to-last syllable. This is the default and the majority case.
- Words ending in any other consonant are stressed on the last syllable.
That is the whole rule for unmarked words. No accent on the spelling means the stress follows one of those two patterns.
| Final letter | Default stress | Examples |
|---|---|---|
| vowel (a, e, i, o, u) | Second-to-last syllable | ca-sa, ha-blan, li-bro, ven-ta-na |
| n | Second-to-last syllable | vi-ven, ca-mi-nan, jo-ven |
| s | Second-to-last syllable | li-bros, ca-sas, ha-bla-mos |
| any other consonant | Last syllable | ho-tel, doc-tor, mu-jer, na-riz, fe-liz |
A handful of vowel + s and vowel + n endings carry the stress on the last syllable - those are the words that need the written accent. Read on.
When the written accent appears
A Spanish word wears the acute accent (á, é, í, ó, ú) when its actual stress does not match the default. The accent is the spelling's way of telling you the rule does not apply to this word.
Take música (music). The word ends in a vowel, so the default rule predicts stress on the second-to-last syllable: mu-SI-ca. But the word is actually pronounced MU-si-ca, stressed on the first syllable. To signal that the default does not apply, the spelling carries the accent on the ú: música.
Take canción (song). The word ends in n, so the default rule predicts stress on the second-to-last syllable: CAN-cion. But the actual stress is on the last syllable: can-CION. The accent on the ó signals the override.
Take fácil (easy). The word ends in a consonant other than n or s (an l), so the default rule predicts stress on the last syllable: fa-CIL. But the actual stress is FA-cil. The accent on the á signals the override.
The four patterns of accent placement, named after the position of the stressed syllable, are:
| Term | Stress position | Default-rule fit | Written accent? |
|---|---|---|---|
| Aguda | Last syllable | Matches rule 2 (ending in consonant other than n/s) | Only if word ends in vowel, n, or s. Café, canción, autobús. |
| Llana / grave | Second-to-last syllable | Matches rule 1 (ending in vowel, n, or s) | Only if word ends in any other consonant. Fácil, lápiz, cárcel. |
| Esdrújula | Third-to-last syllable | Always breaks both rules | Always. Música, plástico, sábana. |
| Sobresdrújula | Fourth-to-last (or earlier) | Always breaks both rules | Always. Dígamelo, devuélvemelo. |
A useful reframing: any word stressed on the third-to-last syllable or earlier always wears a written accent. The two default rules cover only the first two stress positions; anything earlier needs the mark.
Worked examples
Read the column on the right out loud and check yourself against the column on the left.
| Spelling | Stress (capitals = stressed) | Why |
|---|---|---|
| casa | CA-sa | Ends in vowel, rule 1, no accent needed. |
| hablan | HA-blan | Ends in n, rule 1, no accent needed. |
| libros | LI-bros | Ends in s, rule 1, no accent needed. |
| hotel | ho-TEL | Ends in consonant (not n/s), rule 2, no accent needed. |
| doctor | doc-TOR | Ends in consonant, rule 2. |
| café | ca-FÉ | Ends in vowel; stress on last syllable breaks rule 1. Accent needed. |
| canción | can-CIÓN | Ends in n; stress on last syllable breaks rule 1. |
| autobús | au-to-BÚS | Ends in s; stress on last syllable breaks rule 1. |
| fácil | FÁ-cil | Ends in l; stress on second-to-last syllable breaks rule 2. |
| lápiz | LÁ-piz | Ends in z; stress on second-to-last syllable breaks rule 2. |
| música | MÚ-si-ca | Esdrújula. Always accented. |
| plástico | PLÁS-ti-co | Esdrújula. Always accented. |
| matemáticas | ma-te-MÁ-ti-cas | Esdrújula. Always accented. |
| dígamelo | DÍ-ga-me-lo | Sobresdrújula. Always accented. |
Read those aloud once and the rule pattern sinks in. The accent is not decoration; it is the only piece of information distinguishing MU-si-ca from mu-SI-ca, which would be a different (non-existent) word.
Diphthongs, hiatuses, and the tricky cases
A Spanish syllable can contain a single vowel or a diphthong (two vowels that fuse into one syllabic nucleus). The strong vowels are a, e, o. The weak vowels are i, u. The combinations behave as follows:
- Two strong vowels next to each other form two syllables. Te-a-tro (theatre) is three syllables.
- A strong vowel plus a weak vowel forms one syllable (a diphthong) - unless the weak vowel is the one being stressed, in which case the spelling writes an accent on the weak vowel to break the diphthong. Pais would be one syllable, but the country word is país (pa-ÍS), two syllables, with the accent forcing the hiatus.
- Two weak vowels next to each other form a diphthong. Ciu-dad (city) is two syllables; fui (I went) is one.
This explains a whole class of accented words you will see all the time:
- día (DI-a), María (Ma-RI-a), frío (FRI-o), tío (TI-o), mío (MI-o). The accent on the í breaks what would otherwise be a one-syllable diphthong.
- país (pa-IS), raíz (ra-IZ), oído (o-I-do). Same pattern, with different surrounding vowels.
Once you know the rule, you can read these correctly first time.
The homograph accents (tilde diacrítica)
A small closed set of one-syllable words carry an accent that does not change pronunciation. The accent exists only to distinguish two words that would otherwise be spelled the same. These are not stress rules; they are spelling rules.
| Unaccented | Accented | Distinction |
|---|---|---|
| el (the) | él (he) | Article vs personal pronoun. El libro vs él lo trajo. |
| tu (your) | tú (you, informal subject) | Possessive vs subject pronoun. Tu casa vs tú vienes. |
| mi (my) | mí (me, prepositional) | Possessive vs pronoun. Mi padre vs para mí. |
| si (if) | sí (yes) | Conjunction vs affirmative. Si llueve vs sí, claro. |
| te (you, object) | té (tea) | Object pronoun vs noun. Te llamo vs un té. |
| se (reflexive) | sé (I know) | Reflexive pronoun vs verb. Se levanta vs sé la respuesta. |
| mas (but, archaic) | más (more) | Old conjunction (rare today) vs adverb. Más rápido. |
| de (of, from) | dé (give, subjunctive) | Preposition vs verb form. De Madrid vs que él dé la respuesta. |
| aun (even - included) | aún (still - not yet) | Adverb senses split. Aun los niños vs aún no ha venido. |
There is a parallel set for interrogative and exclamatory words. Qué, quién, cómo, cuándo, dónde, cuánto, cuál all wear an accent in questions and exclamations, direct or indirect. They drop the accent when they are used as relative pronouns or conjunctions.
- ¿Qué quieres? What do you want? (interrogative, accented)
- El libro que quieres. The book that you want. (relative pronoun, unaccented)
- No sé qué quieres. I do not know what you want. (indirect question, accented)
- Como tú dices. As you say. (conjunction, unaccented)
- ¿Cómo lo sabes? How do you know? (interrogative, accented)
- No sabe cómo lo hizo. He does not know how he did it. (indirect question, accented)
This is the only Spanish accent rule where you have to think about meaning rather than syllable count. Treat it as a small closed list.
The diaeresis on the ü
Spanish has one more diacritic worth knowing about: the dieresis (also called crema or diéresis), the two dots above the u in güe and güi sequences.
The rule it modifies: a u between g and e or i is normally silent. The combinations gue and gui are pronounced like English "gay" and "gee" - the u exists only to keep the g hard. Guerra is "GE-rra". Guitarra is "gi-TA-rra".
When you want the u to be pronounced in those positions, you write the dieresis to signal it. Vergüenza (shame) is "ver-GWEN-za". Pingüino (penguin) is "pin-GWI-no". Antigüedad (antiquity) is "an-ti-GWE-dad".
The dieresis does not affect stress. It is purely a phonetic marker for the u itself.
Why the system works
Spanish achieves universal readability with a small toolset because the orthography was deliberately reformed several times to keep spelling and pronunciation aligned. The result is that the language pays a small ongoing cost - the accents - to remain phonetically transparent.
Compare with English, where the spelling system is the result of centuries of partial reforms, unreformed historical layers, and borrowed vocabulary that kept its original spelling. The cost is that an adult literate in English cannot reliably pronounce an unfamiliar written word. Spanish gets reading aloud right by tying the accent rule directly to the syllable count.
For an adult learner, this means the up-front cost of memorising the two stress rules and the dozen homograph accents pays for itself the first day you start reading aloud and have nothing else to memorise about pronunciation. The rest of Spanish vowel-and-consonant sound mapping is in the Spanish alphabet guide.
Practical drill
Read the following five-word groups aloud. If you can place the stress correctly without checking, the two rules have stuck.
- libro, libros, libreta, librería, libritos
- canta, cantas, cantó, cantáramos, canción
- joven, jóvenes, juventud, juventudes, juvenil
- útil, útiles, utilidad, utilizar, utilísimo
- examen, exámenes, examinar, examinador, examinadora
Three patterns to notice:
- Plurals can move the stress by adding a syllable. Joven is jó-ven (rule 1); jóvenes (jó-ve-nes) becomes esdrújula and so has to wear the accent. Same for exámenes vs examen.
- Diminutives (-ito, -ita) and augmentatives (-azo, -ón) reset the stress count to fit the new ending under the two rules. Librito is li-BRI-to (no accent); librón is li-BRÓN.
- Verb forms with attached object pronouns keep the original verb's stress and accent it when the rules would otherwise move the stress. Dame is DA-me; dámelo is DÁ-me-lo (esdrújula, accent required); dámelos is DÁ-me-los.
Once you can read those five groups aloud without checking, you have the system. The rest is exposure.
A final note
Two rules. A short list of homographs. One diaeresis. That is the entire diacritic apparatus of standard Spanish, and it is what makes Spanish the single most readable major language for an adult learner. Spend ten minutes here, then go and read.