Pronunciation key
Ordinal numerals
1first [fɜːst]
2second [ˈsɛkn(ə)d]
3third [θɜːd]
4fourth [fɔːθ]
5fifth [fɪf(t)θ]
6sixth [sɪks(t)θ]
7seventh [ˈsɛvnθ]
8eighth [eɪtθ]
9ninth [naɪnθ]
10tenth [tɛnθ]
11eleventh [ɪˈlɛvnθ]
12twelfth [twɛl(f)θ]
13thirteenth [ˌθɜːˈtiːnθ]
14fourteenth [ˌfɔːˈtiːnθ]
15fifteenth [ˌfɪfˈtiːnθ]
16sixteenth [ˌsɪksˈtiːnθ]
17seventeenth [ˌsɛvnˈtiːnθ]
18eighteenth [ˌeɪˈtiːnθ]
19nineteenth [ˌnaɪnˈtiːnθ]
20twentieth [ˈtwɛntɪəθ]
30thirtieth [ˈθɜːtɪəθ]
40fortieth [ˈfɔːtɪəθ]
50fiftieth [ˈfɪftɪəθ]
60sixtieth [ˈsɪkstɪəθ]
70seventieth [ˈsɛvntɪəθ]
80eightieth [ˈeɪtɪəθ]
90ninetieth [ˈnaɪntɪəθ]
100hundredth [ˈhʌndrɪtθ]
1,000thousandth [ˈθaʊzn(t)θ]
1,000,000millionth [ˈmɪljənθ]
1,000,000,000milliardth [ˈmiljɑːtθ], billionth1 [ˈbɪljənθ]

1 The word billion can mean both 109 and 1012.