El precio es doble.

• el = the
• precio = price
• es = is (from ser)
• doble = double

So the sentence literally means The price is double.

El is the masculine singular definite article, meaning the.

It is used because precio is a masculine singular noun:

• el precio = the price

You cannot say la precio because precio is not feminine.

It is masculine.

That is why it takes:

• el precio
• not la precio

A lot of Spanish nouns ending in -o are masculine, and precio follows that common pattern.

Spanish uses two verbs for to be: ser and estar.

Here, es is used because doble describes a characteristic or condition of the price, not a temporary location or state in the usual estar sense.

So:

• El precio es doble = The price is double

Using está here would sound unnatural in standard Spanish.

Here doble is functioning like an adjective or descriptive word meaning double.

It describes el precio:

• El precio es doble = The price is double

You can think of it as similar to:

• El precio es alto = The price is high
• El precio es bajo = The price is low

Usually doble stays the same for masculine and feminine singular:

• El precio es doble
• La cantidad es doble

In the plural, it becomes dobles:

• Los precios son dobles
• Las cantidades son dobles

So it does change for number, but normally not for gender in the singular.

Yes, but there is a slight difference in feel.

• El precio es doble = The price is double
• El precio es el doble = The price is twice as much / the double

The version with el doble often feels a bit more complete or emphatic, especially when there is an implied comparison.

For example:

• Ahora el precio es el doble = Now the price is twice what it was

Not always.

El precio es doble is fine if the comparison is already clear from the context.

If you want to say what it is double of, Spanish often uses el doble de:

• El precio es el doble del anterior = The price is double the previous one
• Cuesta el doble que antes = It costs twice as much as before

So the short sentence works on its own, but context usually tells you double compared to what.

This is the normal Spanish order:

subject + verb + description

• El precio = subject
• es = verb
• doble = description

This is very natural and neutral Spanish word order.

You might sometimes hear other orders for emphasis, but El precio es doble is the standard way to say it.

In standard Peninsular Spanish, precio is pronounced approximately:

PREH-thyo

More carefully:

• pre as in preh
• ci before o is pronounced with the th sound of think in most of Spain
• o as a short, clear o

So:

• precio ≈ PREH-thyo

And the whole sentence is roughly:

• el PREH-thyo es DOH-bleh

In parts of Latin America, the ci would sound more like syo, but in Spain thyo is the usual reference pronunciation.

Yes, if the context makes it obvious what you are talking about.

For example:

• ¿Cuánto cuesta ahora?
• Es doble.

That works in conversation when both speakers already know the subject.

But if you are saying it by itself with no context, El precio es doble is clearer and more complete.

Yes. Some common alternatives are:

• Cuesta el doble. = It costs double / It costs twice as much.
• El precio se ha duplicado. = The price has doubled.
• Vale el doble. = It is worth double / It costs twice as much.

These are often more natural if you are talking about a change in price or comparing one price to another.

To make it a question:

• ¿El precio es doble? = Is the price double?

To make it negative:

• El precio no es doble. = The price is not double.

In Spanish, no usually goes directly before the verb:

• no es = is not