Spanish numbers 1-100: the full list and how they work

0 to 15: pure memorization

Cero, uno, dos, tres, cuatro, cinco, seis, siete, ocho, nueve, diez, once, doce, trece, catorce, quince.

Sixteen words with no internal logic, exactly like English one through twelve. Notice that Spanish keeps unique words two steps further than English does: once, doce, trece, catorce and quince are all irreplaceable, and quince has a life of its own in quinceañera and quince días, which means “two weeks”, not fifteen days of anything.

If you want to drill just this first block before moving on, our Spanish numbers 1-20 page goes slower, with the pronunciation of each word written out.

16 to 19: the fusion starts

Dieciséis, diecisiete, dieciocho, diecinueve.

These were once written diez y seis, “ten and six”, and the modern spelling glued them together. The logic is visible if you read them slowly: dieci- is diez, then the unit. Only dieciséis carries an accent, on the é, because the fused word stresses the last syllable.

20 to 29: one word, three accents

Veinte, veintiuno, veintidós, veintitrés, veinticuatro, veinticinco, veintiséis, veintisiete, veintiocho, veintinueve.

Same fusion, this time from veinte y. Three of them take a written accent (veintidós, veintitrés, veintiséis) for the same reason as dieciséis: the stress lands on the final syllable. Writing veintidos without the accent is the most common spelling error Americans make in this range, and it’s the one a teacher will flag first.

The rule behind those three accents is the general one: a word ending in a vowel, -n or -s is stressed on the next-to-last syllable unless a written accent says otherwise, and veintidós is stressed on the last. That’s the whole logic of Spanish accent marks and stress, and it explains far more than numbers.

30 to 99: back to three words

From 30 onward the numbers separate again, and the pattern never changes: tens + y + unit.

The tens are treinta, cuarenta, cincuenta, sesenta, setenta, ochenta, noventa. Then treinta y uno, cuarenta y siete, ochenta y nueve. No accents, no fusion, no exceptions between 31 and 99.

Two of the tens sound almost identical and get confused constantly: sesenta (60) and setenta (70). One s, one t, twenty years of difference when you’re giving your age.

100: cien or ciento

Cien is the word for exactly 100, standing alone or in front of a noun: cien dólares, cien personas, cien por cien.

Ciento is what you use when something follows: ciento uno, ciento veinte, ciento cincuenta y tres. And it never takes y right after it: ciento uno, never ciento y uno, even though treinta y uno does take one.

Neither form takes an article: cien dólares, not un cien dólares.

The full list, 1 to 100

Cero is zero. It’s not in the list because nobody counts from it, but you need it for phone numbers and temperatures.

The uses that go wrong out loud

Reciting the list is the easy part. These five situations are where the numbers actually get used, and where the mistakes happen.

Uno drops its -o before a masculine noun. Un dólar, veintiún años, treinta y un días. Before a feminine noun it becomes una: una hora, veintiuna personas. Standing alone, counting, it stays uno: ¿Cuántos quieres? Uno. Note that veintiún takes an accent when it sheds the -o.

Prices are read as full numbers, with the currency last. $89 is ochenta y nueve dólares. $99.50 is noventa y nueve dólares con cincuenta, or in speech often noventa y nueve cincuenta. Spanish does not chop prices into digits the way English sometimes does.

Phone numbers go in pairs, not digit by digit. A Spanish speaker reads 55 40 78 as cincuenta y cinco, cuarenta, setenta y ocho. American ten-digit numbers usually get read three-three-four, but the pairs habit is what you’ll hear from a native speaker giving you theirs, and it’s why phone numbers sound impossibly fast at first.

Years are one whole number, never split in halves. 1987 is mil novecientos ochenta y siete. 2025 is dos mil veinticinco. English says “nineteen eighty-seven”; Spanish never does that, so the habit of splitting the year in two is a giveaway.

Age uses tener, not ser. Tengo treinta y ocho años, literally “I have thirty-eight years”. Soy treinta y ocho means nothing. And años is not optional — Tengo treinta y ocho on its own sounds unfinished.

Age is one of a whole family of things you “have” in Spanish, alongside hunger, thirst and cold, so it’s worth knowing the tener conjugation cold. Tengo, tienes, tiene will do most of the work in a first conversation.