पार्सल का वज़न एक किलो है।

A very literal breakdown is:

• पार्सल = parcel
• का = of
• वज़न = weight
• एक किलो = one kilo
• है = is

So the structure is basically:

parcel + of + weight + one kilo + is

Natural English would be The parcel weighs one kilo or The parcel's weight is one kilo.

का shows a relationship like of or 's in English.

So:

• पार्सल का वज़न = the parcel's weight / the weight of the parcel

In Hindi, this kind of relationship is very common:

• राम का घर = Ram's house
• किताब का रंग = the book's color
• पार्सल का वज़न = the parcel's weight

So in this sentence, का links पार्सल and वज़न.

Because का / की / ke agrees with the noun that comes after it, not the possessor.

Here, the noun after it is वज़न, and वज़न is masculine singular, so we use का.

Compare:

• पार्सल का वज़न = the parcel's weight

  • वज़न is masculine singular, so का

• पार्सल की कीमत = the parcel's price

  • कीमत is feminine singular, so की

• पार्सल के कागज़ = the parcel's papers

  • कागज़ is plural, so के

This is a very important Hindi pattern.

Yes, वज़न is treated as masculine singular.

That matters because it controls the form of the possessive marker:

• का वज़न
  not
• की वज़न

So if you learn वज़न as a masculine noun, the sentence becomes easier to understand.

Because Hindi normally puts the verb at the end of the sentence.

So instead of English word order:

• The parcel's weight is one kilo

Hindi gives:

• पार्सल का वज़न एक किलो है

This is very normal Hindi sentence order:

subject/topic + complement + verb

Here:

• पार्सल का वज़न = topic / subject-like part
• एक किलो = complement
• है = is

Hindi usually does not say this with a direct equivalent of English weigh in everyday speech.

Instead, Hindi commonly uses a pattern like:

• X का वज़न Y है = X's weight is Y
  or
• X Y किलो का है = X is of Y kilos

So:

• पार्सल का वज़न एक किलो है = The parcel weighs one kilo

Hindi does have तौलना, but that usually means to weigh something on a scale, not simply to have a weight of.

For example:

• मैंने पार्सल तौला। = I weighed the parcel.

So for stating weight, the sentence you have is the natural pattern.

Yes, absolutely. That is also natural Hindi.

• पार्सल का वज़न एक किलो है = The parcel's weight is one kilo.
• पार्सल एक किलो का है = The parcel is of one kilo / The parcel weighs one kilo.

The second version is a little more compact and conversational.

A useful comparison:

• इस बैग का वज़न पाँच किलो है।
• यह बैग पाँच किलो का है।

Both are fine.

In this sentence, एक is normally needed, because you are giving a specific quantity: one kilo.

So:

• एक किलो है = it is one kilo

If you said only किलो है, it would sound incomplete in most situations.

However, in very casual speech, people sometimes shorten things when the number is obvious from context, but for learners, you should use:

• एक किलो
• दो किलो
• आधा किलो
• सवा किलो, etc.

वज़न is pronounced roughly like vazan or wazan, with the stress not as strong as in English.

A few notes:

• ज़ represents a z sound.
• Many people also write वजन without the dot, especially in casual writing.
• Both spellings are common, and both are understood.

So:

• वज़न = more precise spelling for the z sound
• वजन = very common simplified spelling

As a learner, you should recognize both.

It is a borrowed word, ultimately from English parcel, but it is completely normal in modern Hindi.

Hindi uses many everyday loanwords, especially for practical objects and modern life. So पार्सल sounds natural.

You may also hear other borrowed or semi-borrowed words in similar contexts, such as:

• टिकट
• बस
• फोन
• किलो

So there is nothing unusual about पार्सल here.

Yes.

• एक किलो = very common, everyday
• एक किलोग्राम = more formal or technical

In normal conversation, किलो is much more common.

So these are both correct:

• पार्सल का वज़न एक किलो है।
• पार्सल का वज़न एक किलोग्राम है।

The first one sounds more natural in ordinary speech.

You could say:

• पार्सलों का वज़न एक किलो है। = The parcels' weight is one kilo.

A few things change:

• पार्सल becomes पार्सलों before the postposition
• का becomes का or sometimes you might see other agreement based on the possessed noun, but here वज़न is still masculine singular, so का stays

If you mean each parcel weighs one kilo, context usually makes that clear.

If you want to say The parcels weigh one kilo each, you might need a fuller sentence, for example:

• हर पार्सल का वज़न एक किलो है। = Each parcel weighs one kilo.

That is often clearer.

A natural question would be:

• पार्सल का वज़न कितना है? = How much does the parcel weigh? / What is the parcel's weight?

Here:

• कितना = how much

Because वज़न is masculine singular, we use कितना.

Compare:

• कीमत कितनी है? = What is the price?
  because कीमत is feminine

So the answer would be:

• पार्सल का वज़न एक किलो है।

It is neutral and perfectly standard.

It is suitable for:

• conversation
• delivery/shipping contexts
• customer service
• written standard Hindi

It is neither unusually formal nor slangy.

If you want something a little more conversational, you could also say:

• पार्सल एक किलो का है।

But your original sentence is completely natural and standard.