Kapacita stačí pro třicet návštěvníků.

A very literal breakdown is:

• Kapacita = capacity
• stačí = is enough / suffices
• pro = for
• třicet návštěvníků = thirty visitors

So the structure is basically:

Capacity is enough for thirty visitors.

In natural English, you would usually say something like The capacity is enough for thirty visitors or There is room for thirty visitors.

Stačí is the 3rd person singular present form of stačit.

• stačit = to be enough, to suffice
• stačí = is enough / suffices

It agrees with kapacita, which is singular, so the verb is also singular:

• Kapacita stačí = The capacity is enough

You will often see stačit used in sentences like:

• To stačí. = That’s enough.
• Pět minut stačí. = Five minutes is enough.
• To mi stačí. = That is enough for me.

Because kapacita is the thing that is doing the being enough.

In Czech, the subject is usually in the nominative case, and here kapacita is nominative singular.

So the logic is:

• What is enough? → Kapacita

That is why the verb is stačí, not a plural form.

Also, kapacita is a feminine noun, but in the present tense the 3rd person singular form stačí does not visibly change for gender.

Pro usually means for, and it shows who or what something is intended for.

So:

• pro třicet návštěvníků = for thirty visitors

In this sentence, it tells us the capacity is sufficient for that number of people.

This is a very natural choice with nouns like kapacita and with situations involving room, space, or intended use.

Because after numbers 5 and higher, Czech normally uses the counted noun in the genitive plural.

So:

• pět návštěvníků = five visitors
• deset návštěvníků = ten visitors
• třicet návštěvníků = thirty visitors

The base noun is:

• návštěvník = visitor

Its genitive plural form is:

• návštěvníků

That is why you get:

• třicet návštěvníků

and not třicet návštěvníci.

Good question. The whole phrase pro třicet návštěvníků is functioning as an accusative phrase after pro, but inside that phrase the noun still follows the special numeral pattern.

Here is the key idea:

• pro requires the accusative
• třicet is in the accusative here, but its form happens to look the same as the nominative
• after třicet, the noun stays in the genitive plural: návštěvníků

So the phrase is not breaking the accusative rule. Rather, it is an accusative numeral phrase whose noun is in the form required by the numeral.

This is very normal in Czech.

Yes. With 2, 3, and 4, Czech uses a different pattern.

Compare:

• pro dva návštěvníky = for two visitors
• pro tři návštěvníky = for three visitors
• pro čtyři návštěvníky = for four visitors
• pro pět návštěvníků = for five visitors
• pro třicet návštěvníků = for thirty visitors

So:

• with 2–4, you usually get návštěvníky
• with 5 and up, you usually get návštěvníků

This is one of the most important number patterns in Czech.

Yes, Czech can also use stačit with the dative.

For example:

• Kapacita stačí třiceti návštěvníkům.

This also means The capacity is enough for thirty visitors.

The difference is mostly in structure:

• stačit někomu = to be enough for someone → dative
• stačit pro někoho = to be enough for / sufficient for someone → with pro

The version with pro sounds very natural when talking about capacity, room, or suitability for a certain number of people.

No, Czech word order is fairly flexible.

The neutral order here is:

• Kapacita stačí pro třicet návštěvníků.

But you could change the order for emphasis, for example:

• Pro třicet návštěvníků kapacita stačí.

That might emphasize for thirty visitors.

Even so, the original sentence is the most neutral and most likely order in ordinary explanation or reporting.

Because kapacita itself is a singular noun meaning capacity.

It refers to one abstract quantity: the amount of space available.

So even if it is enough for many people, the noun itself is still singular:

• Kapacita stačí = The capacity is enough

Compare English:

• The capacity is enough for thirty visitors
• not The capacity are enough

Same basic idea.

A few helpful points:

• Czech stress is usually on the first syllable
• so you stress KA in kapacita
• STA in stačí
• TŘI in třicet
• NÁV in návštěvníků

The hardest part for many English speakers is ř in třicet. It is a special Czech sound, something like a rolled r mixed with a zh-like sound. Most learners need time to master it, so that is normal.

Also note:

• č in stačí sounds like ch in church
• í is a long vowel
• ů is also a long vowel

So:

• stačí has a long final vowel
• návštěvníků ends with a long -ků

If your ř is not perfect yet, native speakers will usually still understand you from context.

Yes. It is a very useful pattern:

[noun in nominative] + stačí + pro + [number] + [counted noun]

For example:

• Kapacita stačí pro deset lidí. = The capacity is enough for ten people.
• Sál stačí pro padesát hostů. = The hall is enough for fifty guests.
• Místnost stačí pro dvacet studentů. = The room is enough for twenty students.

Just remember the number rule:

• after 5+, the counted noun is usually genitive plural
• after 2–4, the form is different

So this sentence is a very good pattern to learn.