Roman numerals converter
Numbers to Roman numerals and back.
Quick answer
To convert to Roman numerals, type a number from 1 to 3999. To go back, type the numerals such as MCMXCIV.
Roman numeral
MMXXVI
How to use the roman numerals tool
- Type a number from 1 to 3999, or Roman numerals such as MCMXCIV.
- The answer appears below straight away.
- Press Copy to use it.
Roman numerals use the letters I, V, X, L, C, D and M. A smaller letter before a larger one is subtracted (IV is 4), and after it is added (VI is 6).
Common questions
How do I write 4 and 9 in Roman numerals?
Four is IV (one before five) and nine is IX (one before ten). The same rule gives 40 as XL, 90 as XC, 400 as CD and 900 as CM.
Why does it stop at 3999?
Standard Roman numerals have no symbol above M (1000) and repeat a letter at most three times, so the largest number is MMMCMXCIX, which is 3999.
Why is IIII not accepted?
The standard form writes 4 as IV. Clock faces sometimes use IIII, but this tool only accepts the standard form so it can catch typing mistakes.
Is there a zero?
No. The Romans had no symbol for zero, so the converter starts at 1.
Is anything sent to a server?
No. It is calculated in your browser.