โ Math
Roman Numeral Converter
Roman numerals use seven symbols and work by addition, except when a smaller symbol precedes a larger one, which means subtraction. The largest value expressible in standard form is 3,999.
How it works
Number or Roman numeral
Direction
Result
Decimal value
Symbols used
Frequently asked questions
How do I use the Roman Numeral Converter?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.