Spanish Phrase
Son 10 libras.
Meaning
The sentence means ‘It’s 10 pounds.’ It is used to state the weight of an object, not its price. The number can be written as a digit or spelled out (diez).
When to use
Use this phrase when you need to tell someone the weight of something – e.g., at a market, when checking luggage, or describing a package for shipping.
✦Grammar Breakdown
Son10libras
Ser (son)
‘Son’ is the third‑person plural present of the verb *ser*, used for identification, classification or stating quantities.
Libras (unit)
‘Libras’ is a feminine plural noun meaning ‘pounds’ (unit of weight). It follows the number without an article.
Number agreement
When a noun is plural, the verb must also be plural (hence *son* not *es*).
🗨In Conversation
¿Cuánto pesa la maleta?
How much does the suitcase weigh?
Son 10 libras.
It’s 10 pounds.
✕Common Mistakes
Es 10 libras.
‘Es’ is singular; you need the plural form ‘son’ because ‘libras’ is plural.
Son una 10 libras.
The indefinite article is not used before a plural noun when stating a quantity.
Son 10 dólares.
‘Libras’ here refers to weight, not currency. Use ‘dólares’ only when talking about money.
↔Alternatives
Pesan 10 libras.
They weigh 10 pounds.
Tiene un peso de 10 libras.
It has a weight of 10 pounds.
Son diez libras.
It’s ten pounds.
Cultural Tip
In most Spanish‑speaking countries the metric system is standard, so kilograms are more common. However, in the United States and some Caribbean regions ‘libras’ (pounds) are still used, especially for body weight, luggage, or when dealing with American products. Adjust your unit according to your audience.