Roman Number Conversion Calculator

➔ Convert Standard Numbers to Roman Numbers
➔ Convert Roman Numbers to Standard Numbers

Convert Standard Numbers to Roman Numbers

Enter Standard Number:
Roman Number:

Convert Roman Numbers to Standard Numbers

Enter Roman Number:
Standard Number:

A Roman numeral conversion calculator is a tool designed to convert numbers between the Roman numeral system and the standard Arabic numeral system (the numbers we use daily, like 1, 2, 3, etc.). Roman numerals are an ancient system used by the Romans, primarily in their architecture, clocks, books, and other record-keeping.

Why use it?

Roman numerals are still used today in various contexts like clock faces, book chapters, movie sequels (e.g., "Rocky IV"), and dates (e.g., the year on monuments). A Roman numeral conversion calculator makes it easy to quickly switch between the two systems.

How does it work?

  1. For Conversion from Roman Numerals to Arabic Numbers: The calculator scans the Roman numeral string from left to right, interpreting each letter based on its assigned value. When a numeral is followed by one of a greater value, it's subtracted (like IV for 4), otherwise, it's added.

  2. For Conversion from Arabic Numbers to Roman Numerals: The calculator uses predefined rules (like 1 = I, 5 = V, 10 = X, etc.) to break down the number and construct the Roman numeral, using subtraction rules like IV for 4, IX for 9, etc.

When to use it?

You'd typically use it when:

  • You need to convert between Roman and Arabic numerals.
  • You’re learning about Roman numerals or working on a project where you need to include them.