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Converters & Notation

Roman Numeral Converter

Type a number from 1 to 3999 or a Roman numeral. The converter shows which symbols make up the value and validates numerals so IIII is flagged.

Updated October 3, 2026Written and reviewed by Mateuss M.Method: how we calculate

Try an example:

AnswerMCMXCIV

1994 in Roman numerals

Step-by-step working 1 steps

1
Take the largest value that fits, repeatedly
```
1000 → M
900 → CM
90 → XC
4 → IV
```
Subtractive pairs (CM, CD, XC, XL, IX, IV) are used instead of four equal symbols in a row.

How to use the roman numeral converter

Type a number or numeral.
Read the converted value.
Open the breakdown to see each symbol.
Try the examples for tricky cases like 49.

Symbols

I = 1   V = 5   X = 10   L = 50
C = 100   D = 500   M = 1000
Subtractive pairs: IV 4, IX 9, XL 40, XC 90, CD 400, CM 900

Standard numerals do not repeat a symbol more than three times in a row.

Worked examples

Each example below is generated by the same calculator you used above, so the working always matches the answer.

1994

AnswerMCMXCIV

1994 in Roman numerals

Step-by-step working 1 steps

1
Take the largest value that fits, repeatedly
```
1000 → M
900 → CM
90 → XC
4 → IV
```
Subtractive pairs (CM, CD, XC, XL, IX, IV) are used instead of four equal symbols in a row.

MCMXCIV

Answer1994

MCMXCIV as a number

Step-by-step working 1 steps

1
Read left to right, grouping subtractive pairs
```
M = 1000
CM = 900
XC = 90
IV = 4
Sum = 1994
```

49

AnswerXLIX

49 in Roman numerals

Step-by-step working 1 steps

1
Take the largest value that fits, repeatedly
```
40 → XL
9 → IX
```
Subtractive pairs (CM, CD, XC, XL, IX, IV) are used instead of four equal symbols in a row.

2026

AnswerMMXXVI

2026 in Roman numerals

Step-by-step working 1 steps

1
Take the largest value that fits, repeatedly
```
1000 → M
1000 → M
10 → X
10 → X
5 → V
1 → I
```
Subtractive pairs (CM, CD, XC, XL, IX, IV) are used instead of four equal symbols in a row.

Common mistakes to avoid

Writing 49 as IL

XLIX is correct: 40 (XL) + 9 (IX). Only I, X and C subtract, and only from the next two larger symbols.

Repeating a symbol four times

4 is IV, not IIII (clock faces are a well-known exception).

Expecting zero or fractions

Standard Roman numerals have no zero and cover 1 to 3999.

Frequently asked questions

Why stop at 3999?

Standard numerals have no symbol above M, and MMMM would break the three-repeat rule.