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The symbols "I", "X", "C", and "M" can be repeated three times in succession, but no more. (They may appear more than three times if they appear non-sequentially, such as XXXIX.) "D", "L", and "V" can never be repeated.
"I" can be subtracted from "V" and "X" only. "X" can be subtracted from "L" and "C" only. "C" can be subtracted from "D" and "M" only. "V", "L", and "D" can never be subtracted
Only one small-value symbol may be subtracted from any large-value symbol.
A horizontal line above a Roman Numeral represent one thousand times that Roman Numeral.
To enter a Roman Numeral with a horizontal line above it, type the # key and then the Roman Numeral.
I = 1,000 type #i or #I
V = 5,000 type #v or #V
X = 10,000 type #x or #X
L = 50,000 type #l or #L
C = 100,000 type #c or #C
D = 500,000 type #d or #D
M = 1,000,000 type #m or #M
MMMCMXCIXCMXCIX = 3,999,999 type #m#m#m#c#m#x#c#i#xcmxcix
Type a Number or a Roman Numeral in the entry box and then click "Click to Convert"
The range of numbers the computer will accept is 1 to 3,999,999.
The largest Roman Numeral the computer will convert is MMMCMXCIXCMXCIX (3,999,999)
The computer will ignore decimal points and commas.
The computer will ignore letters that are not Roman Numeral letters.
Letters for the Roman Numeral entry box may be typed in upper or lower case.
If the number is 2154 you may type "2,154", you may type the comma. Type "2,154".
If you want to type "256,678", but you type "25k,678", the computer will use "25678" to calculate the answer.
If you type "ghblxz", the computer will use " " to calculate the answer.
NaN = not a number
To clear the entry boxes click "Reset".
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