Roman Numeral Converter

Convert between Arabic numbers (1,2,3) and Roman numerals (I, V, X, L, C, D, M). Instant, accurate, educational.

Roman ↔ Arabic Converter

enter value to convert

From:

👉 Arabic number

To:

Roman

🔁 Roman numeral

conversion

MMXXVI

2026 in Roman numerals

validated with classic Roman rules (subtractive notation)

How it works: Roman numerals use letters I=1, V=5, X=10, L=50, C=100, D=500, M=1000. Modern standard uses subtractive principle (e.g., IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900).

Roman numeral reference chart

Roman	Value	Roman	Value	Roman	Value
I	1	X	10	C	100
II	2	XX	20	CC	200
III	3	XXX	30	CCC	300
IV	4	XL	40	CD	400
V	5	L	50	D	500
VI	6	LX	60	DC	600
VII	7	LXX	70	DCC	700
VIII	8	LXXX	80	DCCC	800
IX	9	XC	90	CM	900
V̅	5000	X̅	10000	M	1000

* Vinculum (bar) multiplies by 1000, but our converter supports up to 3999 (classic).

How to use the roman converter

1 enter value

Type an Arabic number (e.g., 2026) or a Roman numeral (e.g., MMXXVI) in the 'From' field. Choose the correct type from the dropdown.

2 swap if needed

Use the swap button to reverse conversion direction instantly.

3 click convert

Press the gold CONVERT button or use quick presets. Result appears in the lower panel.

4 copy / learn

Read the converted value. Reference chart helps you understand roman numeral combinations.

Understanding Roman numerals

Basic principles

Addition: VI = 5+1 = 6 (larger first)
Subtraction: IV = 5-1 = 4 (smaller before larger) — only for I, X, C (e.g., IX=9, XL=40, XC=90, CD=400, CM=900).
No zero: Romans had no symbol for 0.
Repetition: I, X, C, M can be repeated up to three times. V, L, D never repeat.

Common uses today

Clock faces (IV, VI, etc.)
Movie copyright years (e.g., MMXXV)
Book chapters & volume numbers
Monarchs & popes (Elizabeth II, Louis XIV)
Sporting events (Super Bowl LVII)

Note on accuracy: This converter uses strict subtractive notation (standard modern roman). Values above 3999 are not represented with classic symbols (no vinculum support). For large numbers, the converter will warn you.

roman numeral tips & trivia

largest roman number

3999 = MMMCMXCIX. Beyond that, romans sometimes used a vinculum (bar) to multiply by 1000.

no zero, no negative

Romans had no symbol for zero; the concept arrived later with Arabic numerals.

year MMXXVI

2026 in roman is MMXXVI (M=1000, M=1000, XX=20, VI=6). Exactly as our default example.