Mikä on varaosan hinta?

A word-by-word breakdown is:

• Mikä = what
• on = is
• varaosan = of the spare part / spare part's
• hinta = price

So the sentence literally means What is the spare part's price?, which in natural English is What is the price of the spare part?

Because varaosan is the genitive singular form of varaosa.

• basic form: varaosa = spare part
• genitive form: varaosan = of the spare part

In Finnish, when one noun describes another in a relationship like the price of X, the first noun often goes into the genitive:

• auton ovi = the car's door / the door of the car
• tuotteen nimi = the product's name
• varaosan hinta = the price of the spare part

So varaosan hinta is a noun phrase meaning the spare part's price or the price of the spare part.

This is a standard genitive formation.

The basic noun is:

• varaosa

Its stem changes slightly before the genitive ending:

• varaosa → varaosa-
• add -n → varaosan

So the genitive singular is varaosan.

This is very common in Finnish: many singular genitives end in -n.

Varaosa is a compound noun.

It is made of:

• vara = reserve, spare, backup
• osa = part

So varaosa literally means spare part.

Compound nouns are extremely common in Finnish. Usually, English phrases that use two words often become one word in Finnish:

• spare part → varaosa
• car door → auton ovi or in some cases a compound
• telephone number → puhelinnumero

So it is normal that spare part is written as one word in Finnish.

Because mikä is the correct question word here.

In this sentence, mikä asks for the identity or value of something:

• Mikä on hinta? = What is the price?
• Mikä on nimesi? = What is your name?

A very useful pattern is:

• Mikä on ... ? = What is ... ?

By contrast, mitä is usually the partitive form of mikä and is used in different structures, for example:

• Mitä teet? = What are you doing?
• Mitä tämä tarkoittaa? = What does this mean?

So in Mikä on varaosan hinta?, mikä is the natural choice.

On is the 3rd person singular form of olla, which means to be.

So:

• on = is

The whole structure is like English:

• Mikä on varaosan hinta?
• What is the price of the spare part?

Finnish often uses this same pattern when asking for a price, name, address, or other identifying information.

Yes. A very common alternative is:

• Paljonko varaosa maksaa? = How much does the spare part cost?

This is more directly about cost. Your original sentence,

• Mikä on varaosan hinta?

is slightly more like:

• What is the price of the spare part?

Both are natural. The version with hinta focuses on the price as a noun, while maksaa focuses on the action to cost.

Yes. Varaosan hinta is a noun phrase.

It consists of:

• varaosan = genitive modifier
• hinta = main noun

Together they form:

• varaosan hinta = the price of the spare part

Then the whole sentence is:

• Mikä = question word
• on = verb
• varaosan hinta = noun phrase

So structurally it is:

• What
  • is
    • the price of the spare part

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

So varaosan hinta can mean:

• the price of the spare part
• sometimes, depending on context, simply spare-part price

The exact meaning comes from context.

In this sentence, English naturally uses the: What is the price of the spare part? But Finnish does not need a separate word for it.

Usually, yes, or at least to a spare part already understood from the context.

Because varaosan is singular genitive, the phrase suggests the price of the spare part. In real life, this could mean:

• a part already mentioned
• a part visible in the situation
• a part understood from the discussion

Finnish often relies on context rather than articles to show whether something is specific.

The normal order here is very natural:

• Mikä on varaosan hinta?

This is the standard question pattern:

• question word + verb + rest of sentence

You may also hear Finnish with different word orders in special contexts for emphasis, but for a learner, this version is the one to use.

So this is the safest basic model:

• Mikä on ... ?

A rough pronunciation guide is:

• Mikä ≈ MI-kah
• on ≈ on with a short o
• varaosan ≈ VA-ra-o-san
• hinta ≈ HIN-ta

A few helpful pronunciation points:

• Finnish stress is usually on the first syllable of each word.
• The ä sound is not like English a. It is more like the vowel in British English cat for many speakers.
• Every written vowel is pronounced clearly, so varaosan is said with all its vowels: va-ra-o-san.
• h is always pronounced.

So the rhythm is quite even:

MI-kä on VA-ra-o-san HIN-ta

Hinta is in the nominative singular.

That is the basic dictionary form:

• hinta = price

In the phrase varaosan hinta, the main noun stays in the nominative, while the modifying noun takes the genitive:

• varaosan = genitive
• hinta = nominative

This is a very common Finnish pattern.

It is neutral and perfectly natural.

It would fit well in situations like:

• asking at a shop
• asking a mechanic
• asking about a product in writing
• speaking politely in everyday conversation

If you wanted a more conversational alternative, Paljonko varaosa maksaa? is also very common. But Mikä on varaosan hinta? is completely correct and natural Finnish.