Math & science
Roman Numeral Converter
Convert standard numbers to Roman numerals or convert valid Roman numerals back into numbers.
Interactive calculator
Convert numbers to and from Roman numerals
Switch between Arabic numbers and Roman numerals for quick historical, educational, and formatting conversions.
Results
Roman numeral
MCMXCIV
Number
1994
How to use it
- 01Choose whether you are converting a number to Roman numerals or Roman numerals to a number.
- 02Enter the number or Roman numeral string.
- 03Review the converted value in the opposite format.
Result guide
- This converter supports the standard range from 1 to 3999 for number-to-Roman conversion.
- Roman numeral input is validated against standard notation rather than simply summing letters.
- Subtractive pairs such as IV and IX are handled automatically.
About this calculator
Roman numeral pages are useful in schoolwork, book formatting, clocks, and historical references where users need quick conversion in both directions.
A good converter should validate Roman input rather than accepting any random letter sequence, because many invalid strings can still look superficially Roman-like.
Frequently asked questions
Why can't I convert numbers above 3999 here?
Because the standard Roman numeral system most people learn and use is typically limited to 1 through 3999 in basic converters.
Why does the converter reject some Roman-letter strings?
Because not every string made from I, V, X, L, C, D, and M follows valid Roman numeral rules.
What is subtractive notation?
It is the rule that uses a smaller numeral before a larger one to indicate subtraction, such as IV for 4 and IX for 9.
Method and limitations
This calculator uses the formula and assumptions described on this page. We do not claim independent professional review. Direct references will be listed here when they support a specific rule or data source used by this calculator.
Results are estimates for general information. Verify current rules and assumptions before making financial, tax, or health decisions.
Read our Editorial and Verification Policy →Related calculators
Keep the next question one click away.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal representations.
Decimal to Fraction Calculator
Convert a decimal into an exact simplified fraction and, when relevant, a mixed-number form.
Ratio Calculator
Simplify a ratio and compare the percentage share represented by each side of the total.