Encoding & Decoding

Roman Numeral Converter (1–3999)

Convert integers from 1 to 3999 to standard Roman numerals and back. Rejects nonstandard forms outside common subtractive notation.

Quick switch→Excel Column Converter

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Quick switch:Excel Column Converter

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Copy this tool URL or open the system share sheet on a supported device.

Use cases

Produce Roman year marks for design layouts
Interpret chapter numbers written in Roman numerals

How to use

Enter an Arabic integer or a Roman numeral
Review the converted value
Copy the result

Example input and output

Number

Roman

MMXXIV

FAQ

Can it convert years beyond 3999?

No. Standard forms here stop at 3999. Larger values need overline notation outside this tool’s scope.

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Excel Column Converter

Excel Column Letter and Index Converter

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Convert between Excel-style column letters (A, Z, AA) and 1-based column indexes. Useful when mapping spreadsheet headers to array indexes in scripts.

Data Excel Math

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