Ordinal Numbers: 1st, 2nd, Rules and Conversions
Everything about ordinal numbers: st/nd/rd/th suffixes, spelled-out ordinals, irregular forms, and style guide rules for using them in writing.
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Ordinal Numbers: 1st, 2nd, 3rd — The Rules and Exceptions Ordinal numbers express position or rank: first, second, third, or their abbreviated forms 1st, 2nd, 3rd. The suffix rules are mostly regular but have famous exceptions (11th, not 11st), and the written-out forms have irregular patterns that trip up even native English speakers. --- Ordinal Number Suffixes The suffix rule for ordinal numerals: | Ending | Suffix | Examples | |--------|--------|---------| | 1 (except 11) | st | 1st, 21st, 101st, 1001st | | 2 (except 12) | nd | 2nd, 22nd, 102nd | | 3 (except 13) | rd | 3rd, 23rd, 103rd | | All other digits | th | 4th, 5th, 11th, 12th, 13th, 20th, 100th | The "except 11, 12, 13" rule is the key exception: The rule depends on the last two digits, not just the last digit. --- Computing…
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