Finns det kaffe kvar?

Because det finns is the standard Swedish way to say there is / there are when you are talking about existence or availability.

So:

• Det finns kaffe. = There is coffee.
• Finns det kaffe? = Is there coffee?

Using är det would usually mean is it... ?, not is there... ?

So in this sentence, finns det means is there.

Det finns is the normal word order in a statement:

• Det finns kaffe kvar. = There is coffee left.

In a yes/no question, Swedish usually puts the verb first. So:

• statement: Det finns kaffe kvar.
• question: Finns det kaffe kvar?

This is similar to English inversion:

• There is coffee left.
• Is there coffee left?

Not really. In det finns, det is a dummy subject. It is part of the fixed existential expression det finns = there is / there are.

So in this sentence, det does not refer to a specific thing. It is not the same as English it in I drank it.

Think of it as part of the structure:

• det finns = there is / there are

Kvar means left, remaining, or still available.

So:

• kaffe kvar = coffee left
• Finns det kaffe kvar? = Is there any coffee left?

You will often see kvar in sentences about something that remains:

• Har du pengar kvar? = Do you have money left?
• Är det mat kvar? = Is there food left?

Because kaffe is being used as an uncountable noun, like coffee in English.

In English, you usually say:

• Is there coffee left?
• not usually Is there a coffee left?

Swedish works the same way here:

• Finns det kaffe kvar?

If you are talking about a cup or a type of coffee, the wording could change, but in this sentence kaffe just means coffee in general.

Yes, absolutely. Finns det något kaffe kvar? is also correct and means the same thing: Is there any coffee left?

The version without något is very natural and common:

• Finns det kaffe kvar?

Adding något makes the idea of any more explicit:

• Finns det något kaffe kvar?

Both are good Swedish.

Finns is the present tense of the verb finnas, which means to exist, to be found, or in this pattern, there is / there are.

Some useful forms:

• infinitive: finnas
• present: finns
• past: fanns
• supine: funnits

Examples:

• Det finns mjölk. = There is milk.
• Det fanns mjölk. = There was milk.

So Finns det kaffe kvar? is literally built from the present tense finns.

It is neutral and very natural in everyday Swedish. You could use it at home, at work, in a café, or when visiting someone.

It does not sound especially formal or especially casual. It is just standard spoken and written Swedish.

Yes. This is a very useful pattern:

Finns det + noun + kvar?

Examples:

• Finns det te kvar? = Is there any tea left?
• Finns det bröd kvar? = Is there any bread left?
• Finns det kakor kvar? = Are there any cookies left?
• Finns det pengar kvar? = Is there any money left?

So once you learn this sentence, you can reuse the structure with many other words.

A careful pronunciation would be roughly:

finns deh KAF-fe kvahr

A few notes:

• finns has a short i
• det is often pronounced more like de or deh in normal speech
• kaffe has stress on the first syllable: KAF-fe
• kvar has a long vowel sound

In natural spoken Swedish, the whole sentence often flows together quite smoothly, so det may sound reduced.

In most real situations, it means coffee left that is available right now—for example in a pot, thermos, or container.

So if someone asks:

• Finns det kaffe kvar?

they usually mean:

• Is there any coffee left to drink?

The exact situation depends on context, but the idea is always that some amount of coffee may still remain.