Plurals
Plural endings
Swedish plurals are formed in several different ways. Unlike English, Swedish does not have one main plural ending like -s.
Traditionally, they are organized into several declensions or plural groups. The classic system includes endings like -or, -ar, -er, -r, zero plural, and -n. Modern loanwords can also have -s plurals.
en flicka → flickor
en bil → bilar
en röst → röster
en sko → skor
ett äpple → äpplen
ett hus → hus
Some nouns also change their vowel in the plural.
en man → män
en bok → böcker
Because Swedish has several plural patterns, it is best to learn the plural form together with the noun just like the gender of the noun.
A useful "hack" is that the -or, -ar, and -r groups are used with en words. The -n group is mostly ett words ending in a vowel, and zero plural is very common with ett words as well, ending in a consonant.
The -er group is mixed, so it is harder to predict from gender alone.
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The full grammar article explains the main Swedish plural patterns, including endings, stem changes, irregular forms, and the most common learner mistakes.