Roman Numerals Converter
Convert decimal ↔ Roman (1–3999) — two-way, validated.
See how it works
Watch a quick simulation of this tool in action — no file needed.
How to use Roman Numerals Converter
Follow these steps — everything happens instantly in your browser.
- 1
Step 1. Pick a direction: Decimal → Roman or Roman → Decimal.
- 2
Step 2. Type your value — the result updates as you type.
- 3
Step 3. Swap direction with the arrow button if you need to go the other way.
Why use this tool
Frequently asked questions
Everything you might want to know about roman numerals converter.
Popular
Unit Converter
Length, weight, temperature, area, volume & speed — all in one.
File Size Converter
Convert between B, KB, MB, GB, TB & PB — 1024-based.
Scientific Calculator
A real working calculator: functions, constants, memory & percent.
Aspect Ratio Calculator
Find the missing dimension for any aspect ratio.