How to calculate roman numerals
Add values left to right; subtract when a smaller numeral precedes a larger one
Worked example. Roman numeral: 2,026.
Example inputs — Convert: Number → Roman numeral; Number (1–3999): 2,026; Roman numeral: MMXXVI. Starting values are illustrative.
MMXXVI
From George Guju, founder of Calculyn · Educational calculator guidance, not professional advice.
How it works
Roman numerals use I=1, V=5, X=10, L=50, C=100, D=500, M=1000. A smaller numeral before a larger one subtracts (IV = 4); after, it adds (VI = 6).
Assumptions & limitations
- Results are rounded for display.
Formula and assumptions reviewed October 2026 by the Calculyn team. How we build our calculators
Frequently asked questions
Why only up to 3,999?
Standard Roman numerals don't repeat a symbol more than three times, so 4,000 and above need special notation (an overline) rarely used today.