Ordinal Number Converter
Turn integers into English ordinal forms (1st, 2nd, 3rd) and parse ordinals back to numbers with rule-based grammar.
Convert integers to English ordinals and back
Ordinal numbers attach position suffixes in English: 1st, 2nd, 3rd,
4th, with special cases for 11th through 13th. This tool formats integers into numeric and word
ordinals and parses common ordinal strings back to cardinal values for copywriting, tests, and localization QA.
How to use it
- Type an integer in the first field to see numeric and word forms update instantly.
- Paste an ordinal such as
21stor a phrase likeforty-secondin the second field. - Copy the parsed output when you need the normalized cardinal and suffix form.
For date-based ordinals (day-of-year) see Ordinal Date Converter.
Frequently Asked Questions
Why do 11, 12, and 13 use "th"?
English uses "th" for teens (11th, 12th, 13th) even when the final digit would suggest st/nd/rd.
What ordinal phrases are supported?
Numeric forms like 3rd and many English word ordinals (first, twenty-first) map back to integers.
Does this run on the server?
No. All formatting uses your browser only.
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