Kello on puoli kuusi.

In Finnish, half-hours are expressed by referring to the next hour, not the current one.

So puoli kuusi is understood as halfway to six, which means 5:30.

A few examples:

• puoli kuusi = 5:30
• puoli seitsemän = 6:30
• puoli yksi = 12:30

This often feels backwards to English speakers at first, but it is completely normal in Finnish.

Kello literally means clock, but in time expressions it often corresponds to English it in It is 5:30.

So Kello on puoli kuusi literally looks like The clock is half six, but the real meaning is simply It is 5:30.

On is the third-person singular form of olla, which means to be.

So:

• olla = to be
• on = is

That is why Kello on puoli kuusi contains on: it is the Finnish word for is in this sentence.

Finnish does not have articles like English a, an, and the.

So Finnish does not need a separate word for the clock.
Just kello is enough, and the meaning is understood from context.

Yes. In everyday conversation, people often shorten time expressions if the context is clear.

So all of these can work:

• Kello on puoli kuusi.
• Puoli kuusi.

The full sentence is a good neutral, standard form. The shorter version is common in speech.

It is written as two words:

• puoli kuusi

Not puolikuusi.

In this expression, puoli functions as a separate word meaning half.

A simple pronunciation guide is:

• kello ≈ KEL-lo
• on ≈ on
• puoli ≈ PUO-li
• kuusi ≈ KUU-si

A few important pronunciation points:

• Stress is usually on the first syllable of each word.
• ll in kello is a long consonant.
• uu in kuusi is a long vowel.
• Finnish spelling is very regular, so words are usually pronounced much like they are written.

Roughly:

KEL-lo on PUO-li KUU-si

Yes. Puoli kuusi is the normal and natural everyday way to say 5:30.

You may also hear more digital-style expressions in some contexts, such as timetables or very precise speech, but for ordinary conversation puoli kuusi is the standard natural form.

A common question is:

• Paljonko kello on? = What time is it?

So the exchange could be:

• Paljonko kello on?
• Kello on puoli kuusi.

Use this pattern:

• Kello on puoli + next hour

Examples:

• Kello on puoli kolme. = 2:30
• Kello on puoli kahdeksan. = 7:30
• Kello on puoli yksitoista. = 10:30

So the key thing to remember is: Finnish half-hours point forward to the upcoming hour.