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Ordinal Number Converter

Convert numbers to ordinals — 1st, first, primary, Roman — with the irregular cases right.

English ordinals take st, nd or rd after 1, 2 and 3 — except for 11, 12 and 13, which take th despite their final digit. That exception repeats every hundred, so 111 is 111th but 121 is 121st. This converter handles it, along with written-out words and Roman numerals.

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Runs entirely in your browser — nothing is uploaded
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Frequently asked questions

Why is it 11th and not 11st?

Because 11, 12 and 13 are exceptions that take "th" despite their final digits. The rule repeats every hundred, so 111 is 111th while 121 is 121st — which is why naive suffix code gets it wrong.

How to use the ordinal number converter

  1. 1Enter or paste your numbers.
  2. 2Choose the convert to.
  3. 3Choose the language.
  4. 4The result appears immediately — copy or download it.

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Put the working ordinal number converter on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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