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The numbers in Portuguese follow a fairly similar set of rules to the numbers in English. There are a few minor differences and little quirks to pick up, but for the most part Portuguese numbers are one of the simpler aspects of learning the language.
To get the pronunciation right, and to make sure you’re using the numbers in a grammatically correct way, you can practice them with an expert, like the tutors at PortugueseTutoring.com.
Below is a list of the important numbers in Portuguese, from zero up to one trillion. Where gender is an issue, the masculine inflection is marked (m) and the feminine inflection is marked (f). Also, some numbers differ between European and Brazilian Portuguese. The European spellings are marked (EU) and the Brazilian ones (BR).
0: Zero
1: Um (m) / Uma (f)
2: Dois (m) / Duas (f)
(Some numbers in Portuguese–basically, all the numbers ending in 1 or 2–change their spelling depending on the gender of the noun they enumerate.)
3: Três
4: Quatro
5: Cinco
6: Seis
7: Sete
8: Oito
9: Nove
10: Dez
11: Onze
12: Doze
13: Treze
14: Catorze (Sometimes spelled “quatorze” in Brazil)
15: Quinze
16: Dezasseis (EU) Dezesseis (BR)
17: Dezasseis (EU) Dezessete (BR)
18: Dezoito
19: Dezanove (EU) Dezenove (BR)
20: Vinte
21: Vinte e um (m) / Vinte e uma (f)
22: Vinte e dois (m) / Vinte e duas (f)
23: Vinte e três
24: Vinte e quatro
25: Vinte e cinco
26: Vinte e seis
27: Vinte e sete
28: Vinte e oito
29: Vinte e nove
30: Trinta
31: Trinta e um (m) / Trinta e uma (f)
32: Trinta e dois (m) / Trinta e duas (f)
40: Quarenta
50: Cinquenta
60: Sessenta
70: Setenta
80: Oitenta
90: Noventa
100: Cem
101: Cento e um (m) Cento e uma (f)
(Only use the word “cem” when the number is exactly one hundred. If it’s a hundred and something, you say “cento e x”)
200: Duzentos (m) Duzentas (f)
300: Trezentos (m) Trezentas (f)
400: Quatrocentos (m) Quatrocentas (f)
500: Quinhentos (m) Quinhentas (f)
600: Seiscentos (m) Seiscentas (f)
700: Setecentos (m) Setecentas (f)
800: Oitocentos (m) Oitocentas (f)
900: Novecentos (m) Novecentas (f)
1000: Mil
2000: Dois mil (m) Duas mil (f)
1 Million: Um milhão
1 Billion: Mil milhões (EU) Um bilhão (BR)
1 Trillion: Um bilhão (EU) Um trilhão (BR)
(“Um milhão,” “Um bilhão,” and “Um trilhão” are never inflected for gender because in this case the “Um” is enumerating the number of millions, billions, or trillions of things, not the number of things.)
As you can see, once you’ve learned the basic words, the numbers in Portuguese work in a similar way to the numbers in English. Just knowing the numbers, however, won’t get you very far. The best way to learn how to use Portuguese numbers in real situations is to work with a Portuguese tutor, practicing how to use them in the context of real sentences. With regular practice, before long you’ll be using Portuguese numbers with total confidence.