This website was created, because we had the impression, that the conversion of Roman Numbers challenges even smart people. But the rules are easy. We will explain their use, here.

You may use every digit maximum three times. This also means, that the largest number is MMMDDDCCCLLLXXXVVVIII (4998). The smallest is I (1), as there is no digit for zero.

The digits are added, if the larger one is on the left side. Example : CI - here we have C(100) which is left of I(1) - therefore the value is 100 + 1 = 101.

The digits are subtracted, if the smaller one is on the left side. Example : IX - here we have I(1) which is left of X(10) - therefore the value is 10 - 1 = 9.

It is not possible to combine any smaller digit with any larger digit.

• I (1) can only be followed by V (5) and X (10)
• X (10) can only be followed by L (50) and C (100)
• C (100) can only be followed by D (500) and M (1000)

Credits: The calculator is from Netzreport (2006)

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