Roman Numeral Converter
Convert between Arabic and Roman numerals.
Input Data
數字模式請輸入 1–3999；羅馬模式請輸入如 XIV。
Results
MMXXVI
2026 = MMXXVI
At a glance:Roman numerals use I, V, X, L, C, D, M for 1, 5, 10, 50, 100, 500, 1000, combining with subtractive notation.
Formula
Number→Roman: subtract largest denominations first.
Roman→Number: subtract when a smaller value precedes a larger one.
How to Use
- Enter a value and pick a direction.
- Read the converted result.
FAQ
What range is supported?
1–3999 for Arabic→Roman (Roman has no standard zero or larger forms).
Does case matter?
No, upper or lower case is accepted.
Related Tools
References
Content review: Calculatorism Science Team.