Počet je deset.

Počet means count, number, or total amount in the sense of how many there are.

So Počet je deset. means something like:

• The count is ten.
• The total is ten.
• The number is ten.

A useful distinction is:

• počet = the quantity / how many
• číslo = a number as a mathematical or identifying number

So počet is about amount, not just about the abstract idea of a number.

Je is the 3rd person singular form of the verb být (to be).

So:

• počet = the subject
• je = is
• deset = ten

Literally, the structure is:

• Počet = The count
• je = is
• deset = ten

It works just like English X is Y.

Because počet is singular.

Even though deset means ten, the subject of the sentence is not a plural noun like ten things. The subject is počet, which is a singular masculine noun.

So Czech matches the verb to počet, not to deset:

• počet → singular
• therefore je

Compare:

• Počet je deset. = The count is ten.
• Jsou tam deset lidí. would be wrong for standard Czech because the verb would not match the structure correctly.

Here deset is in the nominative.

After být (to be), Czech often uses the nominative for the predicate noun or numeral in this kind of identifying statement.

So in Počet je deset, both parts are essentially in the nominative:

• počet = nominative singular
• deset = nominative numeral

For a beginner, the simplest idea is: after je in a sentence like X is Y, Czech often leaves Y in its basic dictionary form.

Because Czech has no articles.

English says:

• the count
• a count

Czech usually just says:

• počet

Whether it means a count, the count, or just count depends on context.

So Počet je deset can naturally correspond to English with the even though Czech does not say it explicitly.

Yes, it is grammatical, but it sounds a bit formal or context-dependent.

A Czech speaker might use it in situations like:

• statistics
• reports
• inventory
• data tables
• formal descriptions

Depending on the situation, other sentences may sound more natural in everyday speech. For example:

• Je jich deset. = There are ten of them.
• Celkem je deset. = There are ten in total.
• Počet kusů je deset. = The number of pieces is ten.

So Počet je deset. is correct, but in real conversation people often use a more specific or more natural wording.

Yes, Czech word order is relatively flexible, but the normal neutral order here is:

• Počet je deset.

You could also say:

• Deset je počet.

But that sounds marked or stylistic, as if emphasizing ten in contrast with some other number.

In ordinary usage, learners should stick with:

• Počet je deset.

That is the safest and most neutral version.

A rough pronunciation guide for an English speaker is:

• Počet ≈ POH-chet
• je ≈ yeh
• deset ≈ DEH-set

A few details:

• č sounds like ch in church
• j in Czech sounds like English y in yes
• stress is usually on the first syllable of each Czech word

So the whole sentence is roughly:

POH-chet yeh DEH-set

Počet is a masculine inanimate noun.

That matters because Czech nouns have grammatical gender, and gender affects agreement and declension.

Here, the most important result is that počet is singular masculine, so the verb is:

• je = is

At the beginner stage, you do not need to memorize every form right away, but it is useful to know that počet is a masculine noun.

This is a very useful question.

• počet = count, quantity, how many
• číslo = number as a numeral, figure, phone number, room number, etc.

Examples:

• Počet studentů je deset. = The number of students is ten.
• Moje telefonní číslo je... = My phone number is...

So in your sentence, počet is the right word if the meaning is about total quantity.

If you said Číslo je deset, that would more likely mean The number is ten, as in identifying a numeral, not counting items.