What is the largest number supported?

The ordinal suffix and word outputs support numbers up to 1 trillion (1,000,000,000,000). Roman numerals are only generated for 1–3999.

Does it handle negative numbers or decimals?

No — ordinals are only defined for positive integers. Negative or decimal inputs will show an error message.

What does batch mode do?

Paste one number per line into the batch input area and click Convert All to get the ordinal, ordinal word, and Roman numeral for every number at once.

Why does Roman numeral stop at 3999?

Standard Roman numeral notation does not have an established symbol for numbers 4000 and above, so the tool marks those as N/A.

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Number to Ordinal Converter

Convert numbers to ordinal form, ordinal words, and Roman numerals.

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Convert any integer up to one trillion into its ordinal suffix (1st, 2nd, 3rd…), its full ordinal word (first, second, third…), and its Roman numeral representation for values up to 3999. Paste a list of numbers to convert them all at once in batch mode. Useful for sorting logic, reports, ranking systems, and educational content.

使い方

1 Type a number into the input field and press Convert (or Enter).
2 See the ordinal suffix (e.g. 42nd), ordinal word (forty-second), and Roman numeral.
3 For multiple numbers, switch to Batch Mode, enter one number per line, then click Convert All.
4 Copy any result with the copy button.

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