Number to Ordinal Converter

Convert numbers to ordinal words — 1st, 2nd, 3rd — or written form like "twenty-first".

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How it works

Enter any positive integer. The tool produces the short ordinal suffix (1st, 2nd, 3rd, 4th…), the ordinal word form (first, second, third, twenty-first…), and the ordinal in written-out long form (one hundred and first). The suffix rules follow English conventions: -st for 1 (except 11th), -nd for 2 (except 12th), -rd for 3 (except 13th), -th for all others. All conversion runs locally in your browser.

Common use cases

  • Formatting ordinal numbers correctly in a document or report.
  • Generating the written ordinal word for a chapter or section title.
  • Checking the correct suffix for a number near 11, 12, or 13 (the common exceptions).

Frequently asked questions

Why is 11th not 11st?

English ordinal suffixes follow the last two digits, not just the last one. Because 11 ends in 11, it uses -th rather than -st. The same applies to 12th and 13th.

How large a number can I convert?

The tool accurately handles numbers up to about one quadrillion (10^15) in written form. Larger numbers exceed standard named groupings in short-scale English.