How do I use the Roman Numeral Calculator?

Enter numbers to convert to Roman numerals, or enter Roman numerals to convert to Arabic numbers. Use batch mode to convert multiple numbers at once (one per line). Try the arithmetic feature to add or subtract Roman numerals directly.

Is the Roman Numeral Calculator free?

Yes, the Roman Numeral Calculator is completely free. It runs entirely in your browser with no signup, no download, and no data sent to any server.

🏛️

calculator

Roman Numeral Calculator

Advanced Roman numeral converter with batch mode and arithmetic. Convert multiple numbers, add and subtract Roman numerals. Full conversion table included.

roman numeral calculatorroman numeral converterroman numeral arithmeticroman numeralsbatch roman numeral

Advanced Roman numerals

Batch conversion and arithmetic

Batch list

Roman numeral AOperationRoman numeral B

Batch mode accepts one Arabic number or one Roman numeral per line.

Batch rows

Roman result

Arabic result

Batch output

Validated

Conversion table

Quick guide

Arabic	Roman	Note
4	IV	Subtractive
9	IX	Subtractive
40	XL	Tens pattern
400	CD	Hundreds pattern
2024	MMXXIV	Modern year

How to use

How to Use the Roman Numeral Calculator

1 Enter numbers to convert to Roman numerals, or enter Roman numerals to convert to Arabic numbers.
2 Use batch mode to convert multiple numbers at once (one per line).
3 Try the arithmetic feature to add or subtract Roman numerals directly.

Roman numerals use seven symbols: I(1), V(5), X(10), L(50), C(100), D(500), M(1000). Subtractive notation places a smaller value before a larger one (IV = 4, IX = 9).

This advanced tool goes beyond simple conversion with batch processing and arithmetic operations, making it useful for educational purposes and puzzle solving.

More Calculator tools