Нужны ещё мерки.

Because мерки is plural, and нужны agrees with it.

The pattern is:

• нужен — masculine singular
• нужна — feminine singular
• нужно — neuter singular
• нужны — plural

Since мерки means measurements and is plural, Russian uses нужны.

So the sentence is structured like Measurements are needed, not like an impersonal It is necessary.

In the present tense, Russian usually does not use a separate verb for to be.

So where English says:

• More measurements are needed

Russian simply says:

• Нужны ещё мерки

This is very normal. Russian often has a zero copula in the present tense, meaning is/are is just understood.

Мерки is in the nominative plural.

That may feel surprising to an English speaker, because in English we often think in terms of we need something. But in Russian, this sentence is built more like:

• Measurements are needed

So мерки is the thing being described as needed, which makes it the grammatical subject.

If you want to say we need more measurements, you can add who needs them:

• Нам нужны ещё мерки — We need more measurements

Here:

• нам = to us / we in this kind of structure
• мерки still stays nominative plural

Here ещё means something like more, additional, or still.

So depending on context, Нужны ещё мерки can mean:

• More measurements are needed
• We still need measurements
• Additional measurements are needed

The exact English wording depends on the situation, but the core idea is that the existing measurements are not enough yet.

Мерки is the plural of мерка.

In real life, мерки usually means measurements, especially physical measurements taken from a person or object, for example:

• clothing/tailoring measurements
• body measurements
• dimensions needed for making or fitting something

So this word is more specific than a very abstract measurement. It often refers to practical measurements someone takes.

Yes. Russian word order is flexible, and changing it usually changes the emphasis, not the basic meaning.

For example:

• Нужны ещё мерки — neutral; more measurements are needed
• Ещё нужны мерки — puts a bit more focus on ещё
• Мерки ещё нужны — emphasizes мерки

All of these can be correct in the right context.

You add that person in the dative case.

Examples:

• Мне нужны ещё мерки — I need more measurements
• Нам нужны ещё мерки — We need more measurements
• Ему нужны ещё мерки — He needs more measurements

This is a very common Russian pattern:

• Мне нужен...
• Мне нужна...
• Мне нужно...
• Мне нужны...

So literally, it is often closer to To me, ... is needed than to the English pattern I need ....

Not in this exact structure.

With a noun like мерки as the thing that is needed, нужны is the natural choice:

• Нужны ещё мерки

If you use надо or нужно impersonally, Russian usually wants an infinitive or a whole action:

• Надо ещё снять мерки — We still need to take measurements
• Нужно ещё снять мерки — It is necessary to take more measurements

So:

• Нужны ещё мерки = More measurements are needed
• Нужно/надо ещё снять мерки = It is necessary to take more measurements

Those are related, but not the same structure.

The stress is:

• нужны́
• ещё́
• ме́рки

So the sentence is pronounced approximately:

нужны́ ещё́ ме́рки

The stress matters, especially in нужны́ and ещё́.