How to Say "is heavy" in Spanish
The Spanish word for “is heavy” is “pesa” — A1 level. This is a very common word in everyday Spanish.

Examples
Este paquete pesa tres kilos exactamente.
This package weighs exactly three kilos.
Usted pesa la fruta antes de pagar.
You weigh the fruit before paying. (Formal command)
A mi hermana le pesa mucho haber mentido.
It weighs heavily on my sister to have lied (She regrets having lied).
Using 'Pesar' like 'Gustar'
When 'pesar' means 'to bother' or 'to regret,' it is often used backwards, just like 'gustar' (to like). The thing that bothers someone is the subject: 'Me pesa el error' (The mistake bothers me).
Confusing 'Pesar' with 'Sentir'
Mistake: “I regret the mistake: 'Yo peso el error.'”
Correction: The verb 'pesar' is used impersonally or with the 'a + person' structure: 'Me pesa el error.' For simple regret, use 'sentir': 'Siento el error.'
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