Spanish Number Converter & Guide

◄ Back to Spanish Numbers Hub | Practice with Our Spanish Numbers Quizzes!►

Key Takeaways

•Convert any number 0-999,999,999 from digits to Spanish words instantly using our free tool above!
•Learn the patterns for numbers 0-30 (unique forms), 31-99 (tens y units), and 100-199 (cien/ciento)
•Master thousands (mil - never plural) and millions (millón/millones - does become plural)
•Understand the difference between cardinal numbers (one, two, three) and ordinal numbers (first, second, third)
•Avoid common mistakes like "cien libros" vs "ciento libros" and "dos miles" vs "dos mil"

Understanding Spanish Numbers: A Complete Guide

Spanish numbers follow logical patterns, but there are important rules to remember. Unlike English, where numbers like "twenty-one" combine simply, Spanish uses specific structures for different ranges. Once you learn the patterns below, you can spell any number up to 999,999,999 correctly using the converter tool above.

Spanish Number Rules: 0 to 30 (Unique Forms)

The first 31 numbers in Spanish have unique names that must be memorized. Once you master these, the rest of the numbers build upon this foundation.

Number	Spanish	Number	Spanish
0	cero	16	dieciséis
1	uno	17	diecisiete
2	dos	18	dieciocho
3	tres	19	diecinueve
4	cuatro	20	veinte
5	cinco	21	veintiuno
6	seis	22	veintidós
7	siete	23	veintitrés
8	ocho	24	veinticuatro
9	nueve	25	veinticinco
10	diez	26	veintiséis
11	once	27	veintisiete
12	doce	28	veintiocho
13	trece	29	veintinueve
14	catorce	30	treinta
15	quince

Spanish Numbers 31-99: The "Tens y Units" Pattern

From 31 to 99, Spanish numbers follow a simple pattern: the tens word + "y" (and) + the unit word. For example, 31 is "treinta y uno" (thirty and one). Here are the tens you need to know:

Tens	Spanish
40	cuarenta
50	cincuenta
60	sesenta
70	setenta
80	ochenta
90	noventa

Examples:
31 → treinta y uno
45 → cuarenta y cinco
57 → cincuenta y siete
68 → sesenta y ocho
72 → setenta y dos
89 → ochenta y nueve
94 → noventa y cuatro

Sapnish Numbers 100-199: Cien vs Ciento

The number 100 has two forms in Spanish. "Cien" is used for exactly 100, while "ciento" is used for 101-199.

100 → cien
101 → ciento uno
115 → ciento quince
120 → ciento veinte
150 → ciento cincuenta
199 → ciento noventa y nueve

Spanish Numbers 200-900: Hundreds

Hundreds	Spanish
200	doscientos
300	trescientos
400	cuatrocientos
500	quinientos
600	seiscientos
700	setecientos
800	ochocientos
900	novecientos

Note: 500, 700, and 900 have irregular forms (quinientos, setecientos, novecientos) instead of following the regular pattern. For numbers like 245, you combine: doscientos cuarenta y cinco.

Thousands: Using "Mil"

The word for thousand is "mil". Unlike English, "mil" does NOT become plural. You say "dos mil" (two thousand), not "dos miles". This rule applies for all thousands.

1,000 → mil
2,000 → dos mil
5,000 → cinco mil
10,000 → diez mil
100,000 → cien mil
999,000 → novecientos noventa y nueve mil

Millions: Millón vs Millones

Unlike "mil", the word for million DOES change for plural. Use "un millón" for exactly 1,000,000 and "millones" for 2,000,000 and above.

1,000,000 → un millón
2,000,000 → dos millones
5,500,000 → cinco millones quinientos mil
10,000,000 → diez millones
999,999,999 → novecientos noventa y nueve millones novecientos noventa y nueve mil novecientos noventa y nueve

Ordinal Numbers: First, Second, Third in Spanish

Ordinal numbers indicate position or order (1st, 2nd, 3rd). Unlike cardinal numbers, ordinals must match the gender of the noun they modify.

Ordinal	Spanish (Masculine)	Spanish (Feminine)
1st	primero	primera
2nd	segundo	segunda
3rd	tercero	tercera
4th	cuarto	cuarta
5th	quinto	quinta
6th	sexto	sexta
7th	séptimo	séptima
8th	octavo	octava
9th	noveno	novena
10th	décimo	décima

For numbers 11th through 19th, combine "décimo" with the unit: décimoprimero (11th), décimosegundo (12th), etc. For 20th and above, use "vigésimo" (20th), "trigésimo" (30th), "centésimo" (100th), "milésimo" (1000th), and "millonésimo" (1,000,000th).

Note: When "primero" and "tercero" appear directly before a masculine singular noun, they drop the final -o: "primer libro" (first book), "tercer capítulo" (third chapter).

Common Mistakes to Avoid

Using "cien" before another number: Say "ciento uno" not "cien uno" (except for exactly 100)
Making "mil" plural: Say "dos mil" not "dos miles" - mil never becomes plural
Forgetting the accent marks: dieciséis, veintidós, veintitrés, veintiséis all need accents
Writing numbers 31-99 without "y": "treinta y uno" is correct, not "treinta uno"
Confusing "quinientos" (500) with "quinientos" - it's irregular, not "cincocientos"
Using "y" between hundreds and tens: "doscientos treinta" not "doscientos y treinta" - the "y" is only between tens and units
Matching ordinal gender incorrectly: "la primera vez" (feminine) vs "el primer día" (masculine with apocopation)
Writing "un millón" for 2,000,000: Use "dos millones" with the plural form

Quick Reference Chart

Category	Spanish Examples
0-30	cero, uno, dos, tres... treinta (unique forms)
31-99	treinta y uno, cuarenta y dos, etc. (tens + y + units)
100	cien (exact hundred)
101-199	ciento uno, ciento quince, etc.
200-900	doscientos, trescientos, quinientos, etc.
1,000	mil (never becomes plural)
1,000,000	un millón / millones (does become plural)
Ordinal 1st-10th	primero, segundo, tercero, cuarto, quinto, sexto, séptimo, octavo, noveno, décimo

💡 Related Spanish Grammar Tools

Practice Spanish verb conjugations: Spanish Verb Conjugator Tool

Ready to Practice Your Spanish Numbers?

Think you understand Spanish numbers? Test your knowledge with our interactive resources!

📖 Spanish Numbers 1-100: Complete A1 Beginner's Guide►
🔢 Numbers in Spanish: List of Cardinal and Ordinal Numbers►
✍️ Spanish Numbers Exercises
🧠 Spanish Numbers Quiz

What's Next in Your A1 Spanish Journey?

◄ Spanish Alphabet and Pronunciation | Spanish Days of the Week and Months ►