When you want to say two things are equal in some respect — as tall as, as much as, as many books as — Spanish gives you three closely related patterns. They all use como as the second piece, but the first piece changes depending on what you're comparing: adjective or adverb, noun, or verb. Es tan alto como su padre compares heights. Tengo tantos libros como tú compares quantities. Trabaja tanto como yo compares amounts of an action. Once you see the three slots, the system is very regular — and once you internalise the agreement on tanto, your comparisons will sound native immediately.
The three patterns at a glance
| What you're comparing | Pattern | Example |
|---|---|---|
| Adjective or adverb | tan + adj/adv + como | Es tan alto como su padre. |
| Noun (countable or uncountable) | tanto/-a/-os/-as + noun + como | Tengo tantos libros como tú. |
| Action / verb | verb + tanto como | Trabaja tanto como yo. |
These three patterns are the workhorses of equality comparison in Spanish. The trick is to notice what kind of thing you're comparing — quality, quantity of stuff, or amount of action — and pick the matching slot.
Pattern 1: tan + adjective/adverb + como
When the comparison is about a quality (adjective) or a manner (adverb), use tan before it.
Mi hermano es tan alto como mi padre, pero más delgado.
My brother is as tall as my father, but skinnier.
Madrid no es tan grande como Londres, pero da esa sensación.
Madrid isn't as big as London, but it gives that impression.
Habla francés tan rápido como un nativo.
He speaks French as fast as a native.
Llegamos tan pronto como pudimos, había mucho tráfico.
We got here as soon as we could — there was a lot of traffic.
Tan is invariable — it never agrees in gender or number with anything. The adjective after it agrees with the subject of the sentence in the usual way (tan alta como su madre, tan altos como sus padres), and the adverb obviously doesn't change.
Why tan, not tanto?
Tan is the apocopated (shortened) form of tanto, used specifically before adjectives and adverbs. It's the same kind of shortening that gives bueno → buen and grande → gran in attributive position. Tan never appears as a free word; you'll only ever see it directly before an adjective or adverb (or, in the result construction, before an adjective/adverb in tan… que).
Idiomatic tan + adjective exclamations
Stand-alone tan + adjective is also the everyday way to make admiring exclamations.
¡Tan bonita como su madre!
Just as pretty as her mother!
¡Tan listo como su hermano mayor!
Just as clever as his older brother!
These are short and very peninsular — used in admiration, often when meeting someone's relative for the first time.
Pattern 2: tanto/-a/-os/-as + noun + como
When you're comparing the quantity of stuff (countable items, mass nouns, abstract qualities), use tanto — and it agrees in gender and number with the noun.
| Form | Use | Example |
|---|---|---|
| tanto | masculine singular | tanto tiempo como tú |
| tanta | feminine singular | tanta paciencia como ella |
| tantos | masculine plural | tantos libros como tú |
| tantas | feminine plural | tantas amigas como su hermana |
Tengo tantos libros en casa como en el despacho.
I have as many books at home as at the office.
Hay tanta gente en la calle como en agosto, ¡y eso que es martes!
There are as many people on the street as in August — and on a Tuesday!
No tengo tanta paciencia como mi madre, te lo aseguro.
I don't have as much patience as my mother, I can tell you.
Mi hermana ha leído tantos libros como yo este año, y mira que yo leo.
My sister has read as many books as I have this year, and I read a lot.
The agreement is mandatory. ❌Tengo tanto libros como tú with a masculine-singular tanto before a plural noun sounds like a grammatical mistake to a Spanish ear.
Gente is singular
A trap worth flagging early: gente is grammatically singular in Spanish (it takes singular verb agreement and singular tanta), even though it refers to multiple people. Tanta gente — not ❌tantas gentes.
No había tanta gente en la fiesta como esperaba.
There weren't as many people at the party as I'd expected.
Pattern 3: verb + tanto como
When the comparison is about the amount of an action — how much someone works, studies, eats, sleeps — tanto sits after the verb, invariable.
Trabaja tanto como yo, los fines de semana incluso más.
She works as much as I do, even more on weekends.
Estudia tanto como antes, pero le cuesta más concentrarse.
He studies as much as he used to, but it's harder for him to concentrate.
No duermo tanto como me gustaría, sobre todo entre semana.
I don't sleep as much as I'd like, especially during the week.
Después del divorcio salía tanto como cuando tenía veinte años.
After the divorce he was going out as much as when he was twenty.
In this pattern tanto doesn't agree — there's no noun to agree with. The whole tanto como phrase functions like an adverbial expression modifying the verb.
Negative comparisons of equality
To say not as ... as, just negate the verb in the usual way. The tan/tanto and como stay the same.
No es tan caro como parece, te lo cobran en tres meses.
It's not as expensive as it seems — they spread it over three months.
No tengo tantas amigas en Madrid como cuando vivía en Sevilla.
I don't have as many female friends in Madrid as when I lived in Seville.
No trabajo tanto como antes, ahora me cuido más.
I don't work as much as I used to, I take better care of myself now.
Note that English has not so ... as / not as ... as, but Spanish uses only no… tan… como. There is no ❌tan así como or no tan así.
Avoiding que — the most common pitfall
The English speaker's reflex is to translate as ... as with …que, because que is the comparison particle in the inequality patterns (más alto que su padre, menos libros que tú). With equality the connector is always como — never que.
❌ Es tan alto que su padre.
Wrong — equality comparisons use 'como', not 'que'.
✅ Es tan alto como su padre.
He's as tall as his father.
❌ Tengo tantos libros que tú.
Wrong — equality uses 'como'.
✅ Tengo tantos libros como tú.
I have as many books as you do.
The mnemonic: como means "like / as," and as ... as is two of them — tan ... como. Anchor the equality pattern to como and the que mistake will stop creeping in.
Tan ... que — a different construction (result, not comparison)
Now the genuinely confusing twist: there is a construction tan… que, but it doesn't mean equality. It introduces a result: so ... that. The structure is tan + adj/adv + que + clause.
Es tan alto que no cabe por la puerta sin agacharse.
He's so tall that he can't fit through the door without ducking. (result)
Hablaba tan rápido que no entendí la mitad de lo que dijo.
She spoke so fast that I didn't catch half of what she said. (result)
Hace tanto frío que se me ha congelado el café en la terraza.
It's so cold that my coffee froze on the terrace. (result; tanto agrees with frío)
The difference between tan ... como and tan ... que:
| Construction | Meaning | Example |
|---|---|---|
| tan + adj + como | comparison of equality | Es tan alto como su padre. |
| tan + adj + que | result clause | Es tan alto que no cabe. |
You distinguish them by what follows:
- After como you have a noun phrase or pronoun being compared (como su padre, como yo).
- After que you have a full clause expressing the consequence (que no cabe por la puerta).
Tanto/-a/-os/-as ... que — the parallel result construction
The same result-clause structure works with noun comparisons: tanto + noun + que + result.
Tengo tanto trabajo que no voy a poder ir a cenar el viernes.
I have so much work that I won't be able to come to dinner on Friday.
Había tanta gente que no se podía ni andar por la calle.
There were so many people you couldn't even walk down the street.
Llovió tanto que se inundaron varios barrios.
It rained so much that several neighbourhoods flooded.
Note the agreement: tanto trabajo (masc sg), tanta gente (fem sg), and — in the verb-modifier version — llovió tanto (invariable, modifying the verb directly).
Emphatic tan / tanto without como
Spanish also uses tan and tanto on their own as emphatic modifiers, with no comparison partner. The emphasis is roughly so / so much, but with no que-clause attached — the consequence is left implicit.
¡No corras tanto, que vas a chocar!
Don't go so fast, you'll crash!
No te quejes tanto, todos estamos cansados.
Don't complain so much, we're all tired.
¡Qué pena que se haya marchado tan pronto!
Such a shame she had to leave so soon!
These don't compare anything — they intensify. They're very common in spoken peninsular Spanish.
Common Mistakes
❌ Es tan alto que su padre.
Wrong — equality is built with 'como', not 'que'. 'Tan ... que' introduces a result clause, not a comparison.
✅ Es tan alto como su padre.
He's as tall as his father.
❌ Tengo tanto libros como tú.
Agreement error — 'libros' is masculine plural, so the form is 'tantos'.
✅ Tengo tantos libros como tú.
I have as many books as you do.
❌ Hay tantas gente en la calle como en agosto.
Agreement error — 'gente' is grammatically feminine singular, so 'tanta', not 'tantas'.
✅ Hay tanta gente en la calle como en agosto.
There are as many people on the street as in August.
❌ Trabaja tan como yo.
Wrong — when modifying a verb directly (no adjective or adverb in between), use 'tanto', not 'tan'.
✅ Trabaja tanto como yo.
She works as much as I do.
❌ Es tanto alto como su padre.
Wrong — before an adjective, the apocopated form 'tan' is required, not the full form 'tanto'.
✅ Es tan alto como su padre.
He's as tall as his father.
Key takeaways
- Equality comparisons in Spanish use three patterns: tan + adj/adv + como, tanto/-a/-os/-as + noun + como, and verb + tanto como.
- Tan is the apocopated form used only before adjectives and adverbs. Tanto keeps its full form before nouns (where it agrees in gender and number) and after verbs (where it stays invariable).
- The equality connector is always como, never que. Tan ... que exists but means so ... that — a result clause, not a comparison.
- Negate with no on the verb: no es tan alto como su padre, no tengo tantos libros como tú.
- Gente is feminine singular: tanta gente, never ❌tantas gentes.
- Emphatic tan / tanto without como is a separate, intensifying use — very common in everyday peninsular speech.
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Start learning Spanish→Related Topics
- Orden de palabras básico: SVOA1 — The default word order of a Spanish sentence — subject, verb, object — plus how negation, questions, and object pronouns fit into the basic frame.
- Comparativos: más, menos, tan… que / comoA1 — How Spanish builds comparisons of inequality (más/menos … que) and equality (tan … como). The de-vs-que split before numbers, comparing nouns and verbs, and the natural everyday templates.
- Comparativos: más, menos, tan… que / comoA1 — How Spanish builds comparisons of inequality (más/menos … que) and equality (tan … como). The de-vs-que split before numbers, comparing nouns and verbs, and the natural everyday templates.
- Adverbios comparativos y superlativosA2 — Comparing and superlativising Spanish adverbs — más/menos + adv, tan + adv + como, the four irregulars (mejor, peor, más, menos), the lo + más + adv + posible superlative, and the trap that 'más bien' does NOT mean 'better'.
- Comparaciones de desigualdad: 'más/menos...que'A1 — Spanish builds comparisons of inequality with 'más' or 'menos' before an adjective, adverb, or noun and 'que' before the second term — switching to 'de' before a number.