Roman Numerals
Roman Numeral Converter
Type a number or a Roman numeral below — it converts instantly as you type.
How it breaks down
Need a number above 3,999? Try the Large Number converter →
Everything for learning Roman numerals
From classroom lessons to exam practice — every Roman numeral tool a student or teacher could need.
Number → Roman
Convert any number with a full step-by-step breakdown.
Convert to Roman →Roman → Number
Translate Roman numerals back and catch errors instantly.
Translate numerals →Date Converter
Turn any date into Roman numerals — perfect for anniversaries & records.
Convert a date →Tattoo & Fonts
Preview dates in Classical Serif, Minimalist Sans, Gothic & Script with PNG export.
Design tattoo →Calculator
Add, subtract, multiply and divide using Roman numerals.
Open calculator →Large Numbers
Numbers above 3,999 up to 3,999,999 using the vinculum overline system.
Convert large numbers →Chart 1–1,000
Searchable reference grid — print it for your classroom.
View reference chart →Rules & Grammar
Master the 4 golden rules of Roman numerals with visual cards.
Explore the rules →IIII vs IV on Clocks
Why do clock faces use IIII instead of IV? The surprising answer.
Why clocks use IIII →Zero in Roman
How did the Romans handle the concept of nothing?
How zero worked →Super Bowl
Instantly find the Roman numeral for any Super Bowl game.
Find Super Bowl numerals →Royal & Regnal Numbers
From Charles III to Henry VIII & popes: explore royal naming rules and interactive directory.
Explore royal numerals →Movie Credits & Years
Decode MCMLXXXIV or MMXXIV on film credits & uncover Hollywood's anti-dating trick.
Decode movie years →Take the Quiz
Test your knowledge with our speed challenge. 3 difficulty levels!
Take the quiz →Flashcards
Flip, practise and memorise — 3 decks from Beginner to Master.
Practise flashcards →Classroom Worksheets
Customizable drill sheets (1–10, 1–100, arithmetic) with instant Page 2 answer keys.
Generate worksheets →