In Spanish the stress in words depends on how the word ends. If the word ends in an -s or an -n or a vowel, then the word stress is on the last but one syllable, otherwise on the last syllable. Syllables with an accent always have the stress. Read more for a more comprehensive explanation...
Which syllable has the stress?
Does the word end in an -s or an -n or a vowel? Then the word stress is on the last syllable but one:
If the word only exists of one syllable, then the stress is on that syllable, for example:
Does the word end in a consonant (not -s or -n)? Then the word stress is on the last syllable, for example:
If a vowel has an acute accent (acento agudo), then that syllable always has the word stress, for example:
There are strong vowels (a, e, o) and weak vowels (i, y, u). A weak and strong vowel standing together are considered one vowel which is called a diphtong (diptongo). For example:
If the weak vowel is separated from the strong vowel with an accent the vowel with the accent receives the stress: