How to Say "dozen" in Spanish
The most common Spanish word for “dozen” is “docena” — use 'docena' when you mean a precise quantity of twelve items.
docena
doh-SEH-nahdoˈse.na

Examples
Compré una docena de rosas para mi madre.
I bought a dozen roses for my mother.
Necesito una docena de huevos para hacer el pastel.
I need a dozen eggs to make the cake.
Solo queremos media docena de panecillos, por favor.
We only want half a dozen rolls, please.
Vimos docenas de pájaros volando hacia el sur.
We saw dozens of birds flying south.
Feminine Noun Rule
Even though it refers to the number twelve (doce), 'docena' is a feminine noun, so you must use feminine articles and adjectives with it (e.g., 'una docena,' 'la docena').
Using 'doce' instead of 'docena'
Mistake: “Compré doce de huevos. (I bought twelve of eggs.)”
Correction: Compré una docena de huevos. ('Docena' is the collective noun for a group of twelve, like how we use 'dozen' in English.)
decena
deh-SEH-nahdeˈsena

Examples
Había una decena de personas esperando en la fila.
There were dozens of people waiting in line.
Compré una decena de huevos para el pastel.
I bought ten eggs for the cake.
Había decenas de personas esperando en la puerta.
There were dozens of people waiting at the door.
El collar tiene una decena de perlas blancas.
The necklace has a set of ten white pearls.
A Label for a Group
Think of 'decena' as a group name rather than a number. Just like we use 'dozen' for twelve, Spanish uses 'decena' for ten.
Connecting with 'de'
When you want to say what you have ten of, you must put the word 'de' (of) after 'decena'. For example: 'una decena de libros'.
Decena vs. Década
Mistake: “Using 'decena' to mean 10 years.”
Correction: Use 'década' for ten years. 'Decena' is only for counting items, not time.
Missing the word 'de'
Mistake: “Saying 'una decena manzanas'.”
Correction: Say 'una decena de manzanas'. It needs that little 'of' to connect to the item.
Docena vs. Decena
Related Translations
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