Learn Roman Numerals Online
Type a number or a numeral. Every result shows how it is built, and every fact on the site comes with a source.
Tools
- XI·XIDate converterBirthdays, weddings and today's date
- MMXXVIYear converterRead a year from a film or a building
- XXVTattoo generatorA date as a design to download
- ⅫFont generatorNumerals to copy and paste in other styles
- ?GeneratorRandom numerals for practice
- IIIIValidatorIs a numeral written correctly?
- XXICenturiesFrom the 1st to the 21st century
Seven letters, six pairs
- I1
- V5
- X10
- L50
- C100
- D500
- M1,000
- IV4
- IX9
- XL40
- XC90
- CD400
- CM900
Add when the letters go down (XVI = 10 + 5 + 1), subtract only with the six pairs, and never repeat a letter more than three times. The guide to the rules goes through each one with examples.
Charts
Numbers 1 to 20
Practice
Learn
From the blog
Common questions
What are the seven Roman numerals?
I = 1, V = 5, X = 10, L = 50, C = 100, D = 500 and M = 1000. Every other numeral is built from these.
How do I read a Roman numeral?
Left to right, adding the values. When a smaller letter comes before a larger one, subtract it: IV is 5 − 1 and IX is 10 − 1.
What is the largest Roman numeral?
MMMCMXCIX (3,999) with the seven letters. Larger numbers use a bar over the thousands; the converter writes them.
How do I write a date in Roman numerals?
Convert the day, the month and the year separately and join them with a dot or another separator. The date converter does it and lets you choose the order.