La báscula pesa el paquete.

Here, báscula means scale or weighing scale.

In Latin America, báscula is widely understood, but the exact word people prefer can vary by country and by type of scale. You may also hear balanza.

A rough guide:

• la báscula: often a weighing scale, especially a practical machine for measuring weight
• la balanza: also scale, and sometimes more like a balance

In everyday speech, both can be correct depending on the region and situation.

Because Spanish nouns have grammatical gender.

• báscula is feminine, so it takes la
• paquete is masculine, so it takes el

So:

• la báscula
• el paquete

This gender does not mean the objects are literally female or male. It is just part of how Spanish grammar works, and you usually need to learn the noun together with its article.

Here, pesa comes from pesar, and it means weighs in the sense of measures the weight of.

So in this sentence, La báscula pesa el paquete, pesar is being used as a transitive verb: something weighs something.

But pesar can also mean to weigh a certain amount:

• El paquete pesa dos kilos. = The package weighs two kilos.

So the same verb can work in two ways:

• pesar + object = to weigh something
• pesar + amount = to have a certain weight

Because el paquete is the thing receiving the action of pesar.

You can ask:

• ¿Qué pesa la báscula? = What does the scale weigh?

Answer:

• El paquete

That makes el paquete the direct object.

Meanwhile, la báscula is the subject, because it is the thing doing the action in the sentence.

Because this is a normal direct object referring to a thing, not a person.

Spanish often uses the personal a before a specific person who is the direct object:

• Veo a María.

But with things, you usually do not use a:

• Pesa el paquete.
• Abro la puerta.
• Compro el libro.

So La báscula pesa el paquete is correct without a.

Yes. Grammatically, la báscula is the subject.

Spanish is treating the scale as the thing that performs the action of weighing. That is perfectly possible grammatically.

Depending on context, other versions may sound more natural in real life, for example:

• Pesan el paquete en la báscula. = They weigh the package on the scale.
• La báscula marca el peso del paquete. = The scale shows the package’s weight.

But your original sentence is still a valid way to express the idea.

Spanish usually uses the simple present for a general action or a straightforward statement:

• La báscula pesa el paquete.

The progressive:

• La báscula está pesando el paquete

would suggest the action is happening right now, in progress. Grammatically it is possible, but it sounds less natural in a basic statement like this, especially with a machine.

So the simple present is the normal choice here.

It is pronounced roughly BAHS-koo-lah.

The stress is on the first syllable:

• BÁS-cu-la

The written accent mark tells you that stress.

Also, báscula is an esdrújula word in Spanish, meaning the stress falls on the third-to-last syllable. Words of that type always carry a written accent.

Often, yes.

You may hear:

• La balanza pesa el paquete
• La báscula pesa el paquete

Both can refer to a scale, but the preferred word depends on region and context. In some places, balanza is more common; in others, báscula is more common. Sometimes people also feel a slight difference in type of device.

So for a learner, the safest idea is:

• both are valid words
• usage depends on country and situation

You would say:

• El paquete pesa dos kilos.

This is a very useful comparison, because it shows the two common patterns of pesar:

1. Something weighs something

   • La báscula pesa el paquete.

2. Something weighs an amount

   • El paquete pesa dos kilos.

So the verb stays the same, but the structure changes.