Free Roman Numeral Converter
Convert numbers from 1 to 3999 to Roman numerals and Roman numerals back to numbers.
Non-standard forms such as IIII are flagged.
- Runs locally
- Type a number
- Or type a numeral
- Read the conversion
- Free
- No sign-up
- Runs in your browser
- No watermark
2026 = MMXXVI
I = 1 · V = 5 · X = 10 · L = 50 · C = 100 · D = 500 · M = 1000
This tool runs in this browser tab and does not ask for an account. What you enter is not sent to PoYo.
Use cases
Where it helps
Quick answers
Open the page and get a result without installing an app.
Any computer
It works in a current browser on Windows, macOS, Linux or ChromeOS.
Nothing to clean up
Close the tab when you are done. PoYo keeps no copy.
Three steps
How to use Free Roman Numeral Converter
Type a number
From 1 to 3999.
Or type a numeral
Like MMXXVI or XLII.
Read the conversion
Both boxes stay in sync.
Features
What this tool includes
Runs locally
This tool runs in this browser tab and does not ask for an account. What you enter is not sent to PoYo.
Type a number
From 1 to 3999.
Or type a numeral
Like MMXXVI or XLII.
Read the conversion
Both boxes stay in sync.
PoYo
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These free tools work on files you already have. To create an image, video or audio from a description, open a PoYo generator.
Free Roman Numeral Converter FAQ
Do I need an account?
No. Open the page and use it.
Is what I enter sent anywhere?
This tool runs in this browser tab and does not ask for an account. What you enter is not sent to PoYo.
Does it cost anything?
No. It is free and does not use PoYo credits.
Can I use it on my phone?
Yes, in a current mobile browser. Tools that need a physical keyboard or mouse are easier on a computer.
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Free to use, right in your browser.
Convert numbers from 1 to 3999 to Roman numerals and Roman numerals back to numbers. Non-standard forms such as IIII are flagged.