Roman Numerals
Arabic numbers to Roman and back.
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Type 2024 or MMXXIV. Subtractive pairs such as IV and XC are used. Overlines for large numbers are not supported.
How to use this tool
- Enter the source value. Type the number, color, or timestamp you want to convert.
- Pick the target unit. Choose the output system. Conversion runs locally.
- Copy the converted value. Use Copy when you need the result elsewhere.
Range
1 through 3999 covers classic forms. 0 and negatives have no standard Roman form here.
Frequently asked
Is IIII allowed for 4?
Clock faces sometimes use IIII. This converter emits IV.
Can I convert a copyright year?
Yes, if it is between 1 and 3999.
Are lowercase letters accepted?
Yes. Output is uppercase.
What about Unicode Roman characters?
ASCII letters I V X L C D M are expected.
Does it accept IM for 999?
No. Non-standard subtractive forms are rejected on decode.