Roman numeral converter

Type a number or Roman numerals. It works out which way to convert.

For example 2026 or MMXXVI.

The symbols

I1
V5
X10
L50
C100
D500
M1,000

Questions people ask

How do Roman numerals work?

Seven letters stand for values: I 1, V 5, X 10, L 50, C 100, D 500, M 1,000. Add them from largest to smallest, except that a smaller letter before a larger one is subtracted: IV is 4, IX is 9, XL is 40, CM is 900.

Why does it stop at 3,999?

Standard Roman numerals repeat a letter at most three times, so MMMCMXCIX (3,999) is the largest. Larger numbers used a bar over a letter to multiply it by 1,000.