How to use the Roman Numeral Converter
- Type a number such as 1999, or Roman numerals such as MCMXCIX.
- The tool detects which one you typed and converts it.
- Click Copy to use the result.
Formula used
| Symbol | I | V | X | L | C | D | M |
|---|---|---|---|---|---|---|---|
| Value | 1 | 5 | 10 | 50 | 100 | 500 | 1000 |
Subtractive pairs: IV 4, IX 9, XL 40, XC 90, CD 400, CM 900. A bar over a numeral multiplies it by 1,000 (V̄ = 5,000).
Worked examples
| Number | Roman |
|---|---|
| 4 | IV |
| 9 | IX |
| 14 | XIV |
| 40 | XL |
| 1999 | MCMXCIX |
| 2026 | MMXXVI |
Frequently asked questions
What is 2026 in Roman numerals?
MMXXVI: MM (2000) + XX (20) + VI (6).
Why is 4 written IV and not IIII?
Roman numerals avoid four repeats of a symbol, so 4 is written as 5 minus 1. Some clocks still use IIII.
Is there a zero in Roman numerals?
No. The Romans had no symbol for zero.
What is the largest Roman numeral?
Without bars, MMMCMXCIX (3,999). With a bar (×1,000), numbers up to 3,999,999 can be written.
How do I write 1 lakh in Roman numerals?
100,000 is C̄ (C with a bar).
Written and tested by MasterKit Online Editorial Team
Our team builds and tests every tool by hand, checks each formula against official sources (IRS, HMRC, the Income Tax Department of India, CBSE, NHS, WHO) and reviews pages whenever rules change. Last reviewed on . Spotted a mistake? Tell us.