La estimación es más alta.

La is the feminine singular definite article, meaning the.

It is used because estimación is a feminine singular noun, so the article has to match it:

• la estimación = the estimate
• una estimación = an estimate

Spanish usually uses articles more consistently than English, so la estimación sounds natural where English might simply say the estimate.

In Spanish, every noun has a grammatical gender. Estimación is feminine because nouns ending in -ción are almost always feminine.

So you get:

• la estimación
• una estimación
• estimación alta

Other common feminine -ción nouns include:

• la información
• la situación
• la comparación

This is grammatical gender, not biological gender.

Adjectives in Spanish usually agree with the noun they describe in gender and number.

Since estimación is feminine singular, the adjective must also be feminine singular:

• estimación alta = high estimate
• estimaciones altas = high estimates

If the noun were masculine, you would use alto instead:

• el precio es más alto = the price is higher

Más alta literally means more high, but in natural English we usually say higher.

Spanish often forms comparatives with:

• más
  • adjective

So:

• más alta = higher
• más baja = lower
• más grande = bigger / larger

In this sentence, La estimación es más alta means the estimate is at a higher level than some other estimate or than before.

Because the comparison can be left implied.

Spanish often omits the second part of the comparison when it is already understood from context.

So:

• La estimación es más alta. = The estimate is higher.
• La estimación es más alta que la anterior. = The estimate is higher than the previous one.

If you want to say what it is higher than, then you add que.

Es comes from ser, which is generally used for identifying or describing something in a more essential or general way.

Here, the sentence is describing the estimate’s level or value as a characteristic:

• La estimación es más alta.

Using estar here would sound unnatural in most contexts, because an estimate is not usually treated like a physical or temporary state in the same way a person or object might be.

A learner shortcut is:

• use ser for descriptions like this
• use estar more for conditions, locations, and temporary states

It can be, but the best word depends on context.

Estimación often works for:

• an estimate
• an estimation
• an approximation

But in real Spanish, especially in business, numbers, or project contexts, you may also hear:

• cálculo = calculation / estimate
• estimado = estimate (in some contexts)
• pronóstico = forecast
• presupuesto = quote / budget estimate

So estimación is correct, but the most natural choice can vary by situation.

It is pronounced with the stress on the last syllable: es-ti-ma-CIÓN.

The written accent mark on ó shows that the stress falls there.

Without getting too technical, the accent mark is needed because the word ends in n, and Spanish spelling rules would otherwise suggest a different stress pattern.

A rough pronunciation is:

• eh-stee-ma-see-ON

The ción ending is very common and is usually stressed like this:

• información
• situación
• comparación

Sometimes, yes, but it depends on what you want to emphasize.

• más alta usually talks about a higher level or number
• mayor often means greater, larger, older, or more important depending on context

For numerical values, más alta is very natural.
For example:

• La temperatura es más alta.
• La cifra es más alta.
• La estimación es más alta.

Mayor can also work in some contexts, but más alta is often the clearer and more idiomatic choice when talking about a number or measured amount.

No, not in a normal sentence like this.

Spanish usually needs an article before a singular countable noun when you are referring to a specific thing:

• La estimación es más alta.

Without la, the sentence sounds incomplete or ungrammatical.

You might omit the article only in special contexts, like titles, labels, notes, or very telegraphic writing.

The structure is:

• La estimación = subject
• es = verb
• más alta = predicate adjective phrase

So the pattern is:

• [noun] + ser + más + adjective

Examples:

• El precio es más alto. = The price is higher.
• La tasa es más baja. = The rate is lower.
• La estimación es más alta. = The estimate is higher.

This is a very common Spanish pattern for comparisons.