Roman Numeral Converter
Convert between Roman numerals and numbers (1–3999).
Number → Roman numeral
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Roman numeral → Number
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Quick reference
I
1
IV
4
V
5
IX
9
X
10
XL
40
L
50
XC
90
C
100
CD
400
D
500
CM
900
M
1000
How it's calculated
- I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000
- A smaller numeral before a larger one is subtracted: IV = 4, IX = 9, XL = 40, CM = 900
Numbers are built from the largest value down: 1987 = M (1000) + CM (900) + LXXX (80) + VII (7) = MCMLXXXVII.
Standard Roman numerals cover 1 to 3,999.
Frequently asked questions
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