How to Say "weight" in Spanish
The most common Spanish word for “weight” is “kilo” — use 'kilo' when referring to a person's body mass or the amount of weight someone has gained or lost, often in informal contexts..
kilo
/kee-loh//ˈkilo/

Examples
He engordado un par de kilos en vacaciones.
I've put on a couple of kilos over the holidays.
Necesito perder unos kilos antes del verano.
I need to lose a few kilos before summer.
Plural Usage
When talking about body weight in general, we usually use the plural form 'los kilos' or 'unos kilos'.
peso
PEH-soh/ˈpeso/

Examples
Necesito saber el peso exacto de mi equipaje.
I need to know the exact weight of my luggage.
Ha perdido diez kilos de peso desde enero.
She has lost ten kilograms of weight since January.
Masculine Noun Rule
Remember that 'peso' is a masculine word, so you must use the masculine article 'el' (el peso) or the plural 'los' (los pesos).
Confusing 'peso' and 'pesado'
Mistake: “Using 'peso' as an adjective (e.g., 'La caja es mucho peso').”
Correction: Use the adjective 'pesada' instead: 'La caja es muy pesada' (The box is very heavy). 'Peso' is the noun (the thing being measured).
Confusing Kilo vs. Peso
Related Translations
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