Number to Ordinal Converter
Convert numbers to ordinal suffixes instantly online. Enter one or multiple numbers and get 1st, 2nd, 3rd, 4th... Handles special cases like 11th, 12th, 13th. Free — runs in your browser.
Related Tools
Markdown → HTML
Convert Markdown to clean HTML instantly. Supports GFM, tables, code blocks, and more.
Case Converter
Convert text to camelCase, PascalCase, snake_case, kebab-case, and more — all at once.
HTML → Markdown
Convert HTML to clean Markdown instantly. Supports headings, links, lists, tables, and code blocks.
Ordinal numbers express rank or position in a sequence — first, second, third — as opposed to cardinal numbers that express quantity. In English, ordinals are formed by appending a suffix (st, nd, rd, or th) to the cardinal number, with special rules for the teens: 11th, 12th, and 13th always take 'th' regardless of their units digit.
The suffix logic follows a pattern: numbers ending in 1 take 'st', ending in 2 take 'nd', ending in 3 take 'rd', and all others take 'th'. However, numbers ending in 11, 12, or 13 always use 'th'. This exception exists because English evolved from Old English where these words ('eleventh', 'twelfth', 'thirteenth') have distinct forms that don't follow the standard contraction pattern.
This tool converts comma-separated lists of integers into their ordinal forms in the browser using pure JavaScript. It handles arbitrarily large numbers, negative values, and edge cases like 111th, 112th, 113th. Common uses include generating ordered lists, formatting dates (May 3rd), building ranking displays, and producing narrative content that references sequence positions.
Common Use Cases
Generating date strings for content
Content management systems and blog platforms often need human-readable date formats like 'May 3rd, 2026' or 'the 21st of January'. Converting day numbers to their ordinal forms is a required step when composing these strings, especially in template engines and email marketing platforms like Mailchimp or Klaviyo that use custom date formatting logic.
Building ranking and leaderboard displays
Leaderboard UIs for gaming platforms, sports apps, and sales dashboards display player or team positions as ordinals: 1st, 2nd, 3rd, 4th. When fetching rank data from an API as integers, the frontend must convert them to ordinal strings for display. Converting a batch of ranks at once speeds up template and mock-up work.
Formatting footnotes and references
Academic writing tools, citation managers (Zotero, Mendeley), and legal document editors frequently need to render ordinal references such as '3rd edition', '2nd Circuit Court', or '14th Amendment'. Converting a list of edition or amendment numbers to ordinals in bulk is faster than manually applying suffix rules, especially for documents with many such references.
Ordinal Suffix Rules
Exceptions: 11th, 12th, 13th always use th regardless of the tens digit.