Roman Numeral Converter
Convert numbers to Roman numerals or Roman numerals to numbers. Supports 1 to 3999. Shows a full symbol breakdown.
How to use the Roman Numerals
Roman numeral symbols
I=1, V=5, X=10, L=50, C=100, D=500, M=1000. A smaller symbol before a larger one means subtraction: IV=4, IX=9, XL=40, XC=90, CD=400, CM=900. All others are additive: VII=7, XII=12, MMXXVI=2026.
When Roman numerals are still used
Clock and watch faces (IIII is common on clocks for visual balance — the 'IIII vs IV' debate has been ongoing since the 14th century). Copyright dates in film and TV credits. Super Bowl numbering (Super Bowl LVIII = 58). Monarchs (King Charles III). Popes. Chapters and book volumes. Academic outlines.
Frequently asked questions
Is the Roman Numerals free to use?
Yes, the Roman Numerals is completely free. There is no sign-up, no account required, and no limit on how often you can use it.
How accurate is the Roman Numerals?
The Roman Numerals uses standard mathematical formulas and produces results accurate to standard precision. For critical applications, always verify with an authoritative source.
What devices does the Roman Numerals work on?
The Roman Numerals works on any device with a modern web browser — desktop, laptop, tablet, or phone. It is mobile-friendly and works offline once the page has loaded.