Number to English Ordinal Converter
Convert numbers to English ordinal forms and back: 21 → 21st / twenty-first, 101 → one hundred first, with negative integers and up to 999 trillion, suffixes (st/nd/rd/th) explained, live validation, recent 10 records, one-click copy and PNG download.
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What is it
This tool turns an ordinary number into its English ordinal form and reads ordinals back into numbers. Ordinals say position or order: 1st, 2nd, 3rd, 21st, 101st, and their spoken word forms first, second, third, twenty-first, one hundred first. The tool explains the suffix rule (st/nd/rd after 1/2/3, th otherwise, with teens always th), builds the full word form with hyphens for compound tens (twenty-first), and handles hundreds, thousands, millions and beyond up to 999 trillion, including negative numbers. Perfect for dates, rankings, address floors, edition numbers and any ordered list.
Notes & fun facts
Ordinal numbers are among the oldest words in English: first and second arrived from Old English thousands of years ago, while suffix writing such as 1st grew out of medieval manuscripts and settled into everyday dates, ranks and addresses by the 19th century.
Origin & history
English ordinals come from ancient Germanic word forms: first traces to a Proto-Indo-European root meaning “forward,” and second was borrowed from Latin secundus (“following”), replacing the Old English word ōðer. The th suffix was already attached to number words in Old English to mark order, while st/nd/rd grew out of sound changes on Old English endings. By the Middle Ages ordinals were routinely used in dates, chapters and royal numbering, such as Henry VIII.
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