Roman Numeral Converter

Type into either field — both update automatically. Supports 1 to 3,999,999 (overlines for thousands).

Quick reference

I
1
V
5
X
10
L
50
C
100
D
500
M
1,000
5,000

A small symbol before a bigger one means subtract: IV = 4, IX = 9, XL = 40, CD = 400. A bar above a letter (the "vinculum") multiplies it by 1,000.