Unit Converters · Numbers
Roman Numeral Converter — Numbers ⇄ Roman Numerals
Turn a number or a year into Roman numerals, or read a Roman numeral back as a number, with each symbol's value broken down. Standard numerals run from I (1) to MMMCMXCIX (3,999); a bar over a numeral multiplies it by 1,000 for bigger numbers. Invalid forms like IIII or VX are flagged.
Also listed inMathematicsEducation
Your inputs
Quick start — try a typical case
Your result Live
Roman Numeral
MMXXVI
2,026
- Breakdown
- M = 1,000 + M = 1,000 + X = 10 + X = 10 + V = 5 + I = 1
- Lower Case
- mmxxvi
How this is calculated
I 1 · V 5 · X 10 · L 50 · C 100 · D 500 · M 1000 · a smaller numeral before a larger one subtracts (IV 4, IX 9, XL 40, XC 90, CD 400, CM 900)
- Bar (vinculum)
- × 1,000 — V̅ = 5,000
Write the number from the largest values down, using the six subtractive pairs (IV, IX, XL, XC, CD, CM) instead of four of the same letter. 2026 = 1000 + 1000 + 10 + 10 + 5 + 1 = MMXXVI. A numeral is never repeated more than three times in a row, which is why plain Roman numerals stop at 3,999.
Assumptions & sources
- Standard (subtractive) Roman numerals; historical variants like IIII on clock faces aren't accepted as input.
- 1Roman numerals — NCERT Mathematics, Class 6 — Knowing Our Numbers
Calculator ID MATH-ROMAN-001 · version 1.0.0
Common questions
How do you write 2026 in Roman numerals?
MMXXVI — M + M + X + X + V + I.
Why is 4 written IV and not IIII?
Standard numerals use subtraction to avoid four of the same letter: IV = 5 − 1. Some clocks still show IIII for style.
Is there a Roman numeral for zero?
No — the Romans had no numeral for zero.