Velikost je správná.

Word by word:

• velikost = size
• je = is
• správná = correct / right

So the full sentence means The size is correct or The size is right.

Because Czech adjectives must agree with the noun they describe in gender, number, and case.

Here, velikost is:

• feminine
• singular
• nominative (the subject of the sentence)

So the adjective also has to be feminine singular nominative, which is:

• správná

The dictionary form is usually správný (masculine singular), but in this sentence it changes to match velikost.

A very useful pattern is that many Czech nouns ending in -ost are feminine, especially abstract nouns.

Examples:

• radost = joy
• možnost = possibility
• zkušenost = experience
• velikost = size

So when you see velikost, you should expect feminine agreement:

• ta velikost
• velikost je správná

It is in the nominative case, because it is the subject of the sentence:

• Velikost = the thing being talked about
• je správná = is correct

Since the noun is nominative singular feminine, the adjective is also nominative singular feminine:

• správná

Because Czech does not have articles like a, an, or the.

So velikost can mean:

• size
• the size
• sometimes a size

The exact meaning comes from context. In this sentence, English will usually translate it as The size is correct.

In normal Czech, yes, you usually need je here.

Je is the 3rd person singular form of být = to be.

So:

• Velikost je správná = The size is correct

Unlike in some other Slavic languages, Czech normally keeps the present-tense form of to be in sentences like this.

If you remove je, you usually no longer have a normal full sentence. For example:

• správná velikost = the correct size

That is just a noun phrase, not a complete statement.

Yes. Czech word order is more flexible than English, but different orders change the emphasis.

The neutral, most straightforward version is:

• Velikost je správná.

You could also say:

• Správná je velikost.

That sounds more marked and emphasizes správná or contrasts velikost with something else.

So for a basic, neutral sentence, Velikost je správná is the best choice.

It can be, but only in the sense of correct, proper, or appropriate.

So here:

• správná = correct / right

It does not mean right as the opposite of left. That would be a different word in Czech.

A rough pronunciation guide is:

• VE-li-kost ye SPRAAV-naa

A few helpful points:

• Czech stress is usually on the first syllable of each word.
• j in Czech sounds like English y in yes, so je sounds like ye.
• á is a long vowel, so správná has a longer a sound in both -práv- and -ná.

You could, but it would not mean exactly the same thing.

• Velikost je správná = The size is correct / the right one
• Velikost je dobrá = The size is good

Správná focuses on correctness or suitability.
Dobrá focuses more generally on being good or acceptable.

So if you mean the size is the correct one, správná is better.

The dictionary form is správný.

Czech dictionaries usually list adjectives in the masculine singular nominative form. From that base form, the adjective changes depending on the noun:

• správný = masculine
• správná = feminine
• správné = neuter

Since velikost is feminine, the sentence uses správná.