Spanish Numbers 1 to 100 and Beyond: Pronunciation and Rules

Spanish numbers 0 to 15

These fifteen are the ones you must memorise cold. Everything after them follows a pattern.

Pronunciation notes:

• The C before E and I, and the Z, are an S sound in Latin America and a "th" (as in "think") in most of Spain. Cero, cinco, once, doce, trece, catorce, quince and diez all contain one. Pick one system and stay with it.
• Seis rhymes with "says", one syllable. Not "see-is".
• Siete and nueve both have a glide: SYEH-teh, NWEH-beh. The V in nueve is a soft B.
• Diez is one syllable: "dyes". Not "DEE-ez".
• Quince has a silent U: KEEN-seh. Not "kwin-say".

Spanish numbers 16 to 29: the one-word numbers

From 16 to 29, Spanish writes each number as a single word. Learners find this the most confusing stretch, so here is the logic: 16 to 19 are "ten-and-six, ten-and-seven..." squashed together (dieciséis), and 21 to 29 are "twenty-and-one..." squashed together (veintiuno).

Spelling detail: dieciséis, veintidós, veintitrés and veintiséis carry a written accent because the stress falls on the last syllable and the word ends in s. Nobody will judge you for forgetting it, but exams will.

The old spellings "diez y seis" and "veinte y uno" as separate words are understood and were standard a century ago; today they look dated.

Spanish numbers 30 to 100: the pattern

From 31 onward, Spanish goes back to three separate words: tens + y + units. Learn the tens and you can build every number to 99.

The formula: treinta y uno (31), cuarenta y dos (42), cincuenta y tres (53), sesenta y cuatro (64), setenta y cinco (75), ochenta y seis (86), noventa y nueve (99). Three words, always with y (and) in the middle, always separate.

The full run of one decade, so you can hear the rhythm:

treinta, treinta y uno, treinta y dos, treinta y tres, treinta y cuatro, treinta y cinco, treinta y seis, treinta y siete, treinta y ocho, treinta y nueve, cuarenta

Two sounds to watch: sesenta and setenta differ by one consonant (S vs T) and are constantly misheard, by learners and natives alike. When it matters, say "sesenta, seis-cero" or "setenta, siete-cero". And cien is one syllable, "syen", not "see-en".

Spanish numbers 1 to 100: the complete list

Uno, un or una: the one rule everyone gets wrong

The number one changes shape depending on what follows it, and so does every number ending in one (21, 31, 41...).

• uno when counting or standing alone: "uno, dos, tres"; "¿Cuántos? Uno."
• un before a masculine noun: un libro (one book), veintiún libros (twenty-one books), treinta y un años (thirty-one years).
• una before a feminine noun: una casa (one house), veintiuna casas (twenty-one houses), cincuenta y una personas (fifty-one people).

Note that veintiún takes a written accent when shortened. And note that age uses años (masculine), so it is always treinta y un años, never "treinta y uno años" or "treinta y una años".

No other number changes for gender except the hundreds (see below). Dos, tres, diez, veinte, cien are fixed.

Hundreds: cien, ciento and the plural hundreds

100 is cien on its own or directly before a noun: cien euros, cien personas, cien por ciento (one hundred percent).

101 to 199 use ciento: ciento uno (101), ciento diez (110), ciento cincuenta y cinco (155), ciento noventa y nueve (199). No "y" after ciento: it is "ciento uno", not "ciento y uno".

200 to 900 are single words that agree in gender with the noun:

Three of them are irregular and must be memorised: quinientos (not "cincocientos"), setecientos (not "sietecientos"), novecientos (not "nuevecientos").

Examples: doscientos dólares (200 dollars), trescientas páginas (300 pages, feminine), quinientos cuarenta y dos (542), novecientas noventa y nueve mujeres (999 women).

Thousands, millions and years

1,000 is mil, and it does not take "un": mil euros, not "un mil euros". Thousands are built by putting a number before mil: dos mil (2,000), diez mil (10,000), cien mil (100,000), quinientos mil (500,000). Mil never becomes plural in these: "dos mil", not "dos miles".

1,000,000 is un millón, and millón is a noun, so it does take un, becomes plural (dos millones), and needs de before a noun: un millón de habitantes (a million inhabitants), tres millones de euros.

A billion in Spanish is mil millones (a thousand million). Un billón in Spanish is a million million, which is the British long-scale billion. This causes real confusion in business; when in doubt, say the number in full.

Years are said as plain numbers, never in pairs: 2026 is dos mil veintiséis; 1998 is mil novecientos noventa y ocho; 1492 is mil cuatrocientos noventa y dos.

Big-number punctuation is reversed from English in most Spanish-speaking countries: a period separates thousands and a comma marks decimals. 1.500,50 means one thousand five hundred point five zero. Mexico and some Central American countries use the English system.

Ordinal numbers: first, second, third

Ordinals agree with the noun and usually go before it: el primer piso (the first floor), la segunda calle (the second street), el tercer capítulo (the third chapter). Primero and tercero drop the final o before a masculine singular noun.

In everyday speech, Spanish rarely uses ordinals above tenth. The eleventh floor is more often el piso once than el undécimo piso, and kings and centuries switch to cardinals after ten: Alfonso XIII is "Alfonso trece", el siglo XXI is "el siglo veintiuno".

Numbers in real life

Prices

• ¿Cuánto cuesta? / ¿Cuánto es? (How much is it?)
• Son quince euros con cincuenta. (It's fifteen euros fifty.) "Con" joins euros and cents in Spain; in Latin America you will also hear "quince con cincuenta" or "quince cincuenta".
• Cuesta doscientos pesos. (It costs two hundred pesos.)
• Ochenta y nueve con noventa y nueve (89.99).

Age

• Tengo veintitrés años. (I'm 23.) Always tener, always años.
• Mi hija tiene un año. (My daughter is one.) Un, not uno, before años.
• Cumplo cuarenta en marzo. (I turn forty in March.)

Time

• Es la una. (It's one o'clock.) Singular, because one is singular.
• Son las dos. Son las diez y media. (It's two. It's ten thirty.)
• Son las cinco menos cuarto / las cuatro cuarenta y cinco. (It's a quarter to five.)
• A las siete y veinte. (At seven twenty.)

Dates

• El cinco de mayo. El veintiocho de febrero. (Cardinals, not ordinals, except el primero de enero.)
• Nací en mil novecientos noventa y cinco. (I was born in 1995.)

Phone numbers

Spanish speakers usually read phone numbers in pairs or in twos and threes, not digit by digit: 647 392 1180 becomes "seis cuarenta y siete, tres noventa y dos, once ochenta" or "seis, cuatro, siete; tres, nueve, dos; uno, uno, ocho, cero". When you give your own number, digit by digit is always safe, and say cero clearly for zero.

Percentages, fractions and math

• el veinte por ciento (twenty percent)
• la mitad (half), un tercio (a third), un cuarto (a quarter), tres cuartos (three quarters)
• dos más dos son cuatro (2 + 2 = 4); diez menos tres son siete; cinco por cinco son veinticinco; veinte entre cuatro son cinco (20 ÷ 4 = 5)
• un punto cinco / uno coma cinco (1.5), depending on the country

Common mistakes with Spanish numbers

• "Veinte y uno" written as three words. From 16 to 29 it is one word: veintiuno.
• "Treinta y uno años". Before a masculine noun, uno becomes un: treinta y un años.
• "Ciento" before a noun for exactly 100. It is cien euros, cien personas. Ciento only appears with a following number (ciento dos) and in "por ciento".
• "Ciento y uno". No y after ciento: ciento uno.
• "Cincocientos", "sietecientos", "nuevecientos". The irregulars are quinientos, setecientos, novecientos.
• "Un mil". Just mil.
• "Un millón habitantes". Millón needs de: un millón de habitantes.
• Saying years in pairs. Dos mil veintiséis, never "veinte veintiséis".
• Mixing up sesenta and setenta. Slow down on 60 and 70; natives do too.
• Pronouncing quince as "kwin-say". The U is silent: KEEN-seh.
• Using ordinals for dates. El cinco de mayo, not "el quinto de mayo".

How to actually get fast at Spanish numbers

Knowing the list and being able to hear "cuarenta y siete con veinte" at a market stall and hand over the right coins are two different skills, and only the second one is useful. Numbers are the part of a language that has to be automatic, because there is never time to think.

1. Count out loud, in patterns. By ones to 30, then by tens to 100, then by fives, then by threes. Backwards from 100. While walking. Every day for a week.
2. Read every number you see in Spanish. Prices, licence plates, the clock, page numbers, your phone's battery percentage. Say them out loud. This is free and it works.
3. Say your own numbers. Your age, phone number, postcode, house number, birth year. Ten times each, until they come out in one breath.
4. Do sums out loud. Dos más tres son cinco. Setenta menos veinte son cincuenta. It forces retrieval, not reading.
5. Practise hearing them at speed. Have someone say random numbers and write them down, or use audio. The gap between reading numbers and hearing them is enormous.
6. Then do it in conversation. SPAIKING's AI speaking partner will ask your age, quote you prices, read out phone numbers and times, and make you say them back, correcting "kwin-say" and "veinte y uno" as you go. Numbers under pressure, with a voice that talks back, is the only practice that transfers to the market stall.