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Ordinal Numbers in English

Convert any number to its ordinal form — first, second, third, and beyond.

Ordinal Suffix Rules
1st
Numbers ending in 1 (except 11)
1st, 21st, 31st, 101st
2nd
Numbers ending in 2 (except 12)
2nd, 22nd, 32nd, 102nd
3rd
Numbers ending in 3 (except 13)
3rd, 23rd, 33rd, 103rd
th
All others including 11, 12, 13
4th, 11th, 12th, 13th, 20th

Frequently Asked Questions

What is an ordinal number?

An ordinal number indicates position or rank — first, second, third, etc. Cardinal numbers count quantity (one, two, three), while ordinal numbers indicate order.

What are the ordinal suffixes in English?

Use "st" for numbers ending in 1 (except 11), "nd" for 2 (except 12), "rd" for 3 (except 13), and "th" for all others.

Why is 11th, 12th, 13th not 11st, 12nd, 13rd?

These are exceptions because they come from Old English. The teens (11–13) always use "th" regardless of their last digit.