This Roman numeral converter turns numbers into Roman numerals and Roman numerals back into numbers. Type either one; the converter detects which you entered and shows a place-by-place breakdown.
Roman numeral symbols
I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1,000. Symbols are added from largest to smallest, except for six subtractive pairs: IV (4), IX (9), XL (40), XC (90), CD (400) and CM (900).
Worked example
2026 = 2000 + 20 + 6 = MM + XX + VI = MMXXVI.
Frequently asked questions
Why does the converter stop at 3,999?
Standard Roman numerals allow at most three M’s. Larger numbers used a bar over a numeral to multiply it by 1,000, which is not part of the standard form.
Is there a Roman numeral for zero?
No. The Roman system had no symbol for zero.
Why is IIII on some clocks?
Many clock faces use IIII instead of IV by tradition and for visual balance. The standard form is IV.