## How to convert ordinal numerals to words in (US) American English, how to write them out using letters instead of numerals

### How to write out ordinal numbers (those denoting order) in words?

#### Most ordinal numbers end in "th", so just add "th" to the end of the cardinal number (those denoting quantity, ex: 1 one, 2 two, 3 three, 4 four, ... etc.):

- cardinal: 4 = four → ordinal: 4th = fourth
- cardinal: 7 = seven → ordinal: 7th = seventh
- cardinal: 10 = ten → ordinal: 10th = tenth
- cardinal: 19 = nineteen → ordinal: 19th = nineteenth
- cardinal: 100 = one hundred → ordinal: 100th = (one) hundredth
- cardinal: 1,000 = one thousand → ordinal: 1,000th = (one) thousandth

#### Exceptions:

- cardinal: 1 = one → ordinal: first = 1st
- cardinal: 2 = two → ordinal: second = 2nd
- cardinal: 3 = three → ordinal: third = 3rd
- cardinal: 5 = five → ordinal: fifth = 5th
- cardinal: 8 = eight → ordinal: eighth = 8th
- cardinal: 9 = nine → ordinal: ninth = 9th
- cardinal: 12 = twelve → ordinal: twelfth = 12th
- cardinal: 20 = twenty → ordinal: twentieth = 20th
- cardinal: 30 = thirty → ordinal: thirtieth = 30th
- cardinal: 40 = forty → ordinal: fortieth = 40th
- cardinal: 50 = fifty → ordinal: fiftieth = 50th
- cardinal: 60 = sixty → ordinal: sixtieth = 60th
- cardinal: 70 = seventy → ordinal: seventieth = 70th
- cardinal: 80 = eighty → ordinal: eightieth = 80th
- cardinal: 90 = ninety → ordinal: ninetieth = 90th

#### Here there are a couple of the main ordinal numbers, from 1st up to 19th, you can find a longer list in the full article:

- cardinal: 1 = one; → ordinal: 1st = first;
- cardinal: 2 = two; → ordinal: 2nd, second;
- cardinal: 3 = three; → ordinal: 3rd, third;
- cardinal: 4 = four; → ordinal: 4th, fourth;
- cardinal: 5 = five; → ordinal: 5th, fifth;
- cardinal: 6 = six; → ordinal: 6th, sixth;
- cardinal: 7 = seven; → ordinal: 7th, seventh;
- cardinal: 8 = eight; → ordinal: 8th, eighth;
- cardinal: 9 = nine; → ordinal: 9th, ninth;
- cardinal: 10 = ten; → ordinal: 10th, tenth;
- cardinal: 11 = eleven; → ordinal: 11th, eleventh;
- cardinal: 12 = twelve; → ordinal: 12th, twelfth;
- cardinal: 13 = thirteen; → ordinal: thirteenth;
- cardinal: 14 = fourteen; → ordinal: 14th, fourteenth;
- cardinal: 15 = fifteen; → ordinal: 15th, fifteenth;
- cardinal: 16 = sixteen; → ordinal: 16th, sixteenth;
- cardinal: 17 = seventeen; → ordinal: 17th, seventeenth;
- cardinal: 18 = eighteen; → ordinal: 18th, eighteenth;
- cardinal: 19 = nineteen; → ordinal: 19th, nineteenth;