This converts Roman numerals to Arabic and back. It assumes standard Roman
numeral positional notation. Prefix values are limited to the next lesser
multiple of ten. The standard numeral range is I=1, V=5, X=10, L=50, C=100,
D=500, M=1000. The extended range adds Y=5000, Z=10000, F=50000, H=100000,
B=500000, and A=1000000. Some users of Roman numerals used a bar
over the standard value to indicate multiplcation by 1000. Use the extended
range for these examples.
To convert from Roman to Arabic, enter the value in the box denoted
Roman and then click anywhere outside the box or press the Enter key. To
convert from Arabic to Roman, enter the value in the box marked Arabic
and click or press Enter.