Roman Numeral Calculator & Converter

NUMBER FROM 1 TO 3999

Enter a whole number between 1 and 3999.

ROMAN NUMERAL

Use standard Roman numerals: I, V, X, L, C, D and M.

FIRST

OP

SECOND

Arithmetic results must be whole numbers from 1 to 3999 to be shown as standard Roman numerals.

ROMAN NUMERAL

MMXXVI

2026 = MMXXVI

Roman numeral symbols

I

1

V

5

X

10

L

50

C

100

D

500

M

1000

Common Roman numeral combinations

IV 4

IX 9

XL 40

XC 90

CD 400

CM 900

How Roman numerals work

Roman numerals use combinations of seven symbols: I, V, X, L, C, D and M.

Normally values are written from largest to smallest and added together. For example, VIII = 8.

In certain combinations a smaller numeral before a larger numeral is subtracted. For example, IV = 4, IX = 9 and XL = 40.

This calculator uses the conventional modern Roman numeral notation for whole numbers from 1 to 3999.

Historical Roman numeral usage was not always completely standardised. This calculator uses the modern conventional forms commonly used today.