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Roman Numeral Converter
Convert numbers to Roman numerals and back, instantly. Type an Arabic number (1–3999) or a Roman numeral in either box and the other updates automatically — free, no sign-up.
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Works for numbers 1 to 3999.
Roman Numeral Values
I
1
V
5
X
10
L
50
C
100
D
500
M
1000
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Roman Numeral Converter — FAQ
How do I convert a number to a Roman numeral?
Type the number (1–3999) in the left box and its Roman numeral appears on the right. Type a Roman numeral on the right to convert it back to a number.
What is the largest number in Roman numerals?
Standard Roman numerals go up to 3,999 (MMMCMXCIX). This converter covers that full range.
What do the Roman numeral letters mean?
I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, and M = 1000. The full reference chart is shown below the converter.
