Roman Numeral Converter

Convert Numbers to Roman Numerals & Roman Numerals to Numbers Instantly

Enter Number

Examples:

Roman Numeral

Enter a number and click convert

Enter Roman Numerals

Examples:

Number

Enter Roman numerals and click convert

Select Date

Formats:

Roman Date

Select a date and click convert

Roman Numeral Reference Chart

The seven basic symbols: I=1, V=5, X=10, L=50, C=100, D=500, M=1000

About Roman Numeral Converter

Our free Roman numeral converter provides instant, accurate conversion between Arabic numbers and Roman numerals. Unlike AI chatbots that often hallucinate complex conversions (especially for numbers like 1999, 4999, or dates), our tool uses deterministic algorithms for 100% accuracy every time. Supports numbers from 1 to 3,999,999 with overline notation for larger values.

How Roman Numerals Work

Roman numerals use seven symbols: I (1), V (5), X (10), L (50), C (100), D (500), M (1000). Numbers are formed by combining these symbols using two rules:

  • Addition: When a larger symbol precedes a smaller one, add their values (VI = 5+1 = 6)
  • Subtraction: When a smaller symbol precedes a larger one, subtract it (IV = 5-1 = 4)

Why This Tool Beats AI

  • 100% Accurate — AI frequently makes errors on complex conversions (e.g., MCMXCIX vs MIM for 1999)
  • Instant Results — No waiting for AI generation, conversions happen in milliseconds
  • Date to Roman — Perfect for tattoos, engravings, and special occasions
  • Large Numbers — Supports up to 3,999,999 with overline notation
  • Privacy Safe — All processing happens in your browser, nothing is sent to any server

Common Uses

  • Decoding movie copyright years and book chapter numbers
  • Creating Roman numeral tattoos and engravings with dates
  • Understanding clock faces and historical documents
  • Academic writing and formal outlines
  • Super Bowl and Olympic event numbering

Frequently Asked Questions

What is the largest number you can write in Roman numerals?

Using standard notation, the largest is 3,999 (MMMCMXCIX). For larger numbers, a vinculum (overline) multiplies the value by 1,000, allowing representation up to 3,999,999.

Why is 4 written as IV instead of IIII?

Roman numerals use the subtraction principle to avoid four consecutive identical symbols. IV is shorter and more standard, though IIII still appears on some clock faces for aesthetic symmetry.

How do I convert a date to Roman numerals for a tattoo?

Use our Date → Roman tab. Each part (month, day, year) is converted separately and joined with dots. For example, June 10, 2026 becomes VI·X·MMXXVI.

What is 2026 in Roman numerals?

2026 in Roman numerals is MMXXVI. M=1000, M=1000, X=10, X=10, V=5, I=1. Total: 2000+20+5+1 = 2026.

Does this tool work offline?

Yes! Since everything runs in your browser via JavaScript, you can use this tool even without an internet connection after the first load.

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