Question 1

What are the basic Roman numerals?

Accepted Answer

I=1, V=5, X=10, L=50, C=100, D=500, M=1000.

Question 2

How does subtractive notation work?

Accepted Answer

Place a smaller numeral before a larger one to subtract: IV=4, IX=9, XL=40, XC=90, CD=400, CM=900.

Question 3

What range can I convert?

Accepted Answer

Commonly 1 to 3,999 using standard symbols. Larger numbers sometimes use bars for thousands, but conventions vary.

Question 4

Are there zeros or negative numbers?

Accepted Answer

Roman numerals have no symbol for zero and do not represent negatives in the classic system.

Question 5

How do I format years and outlines?

Accepted Answer

Years often appear as Roman numerals (MMXXV). Outlines use uppercase with periods (I., II., III.).

Roman Numerals Calculator — Roman to Decimal Converter