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Roman Numerals

Convert decimal numbers to Roman numerals and Roman numerals to decimal numbers.

Roman numerals

With overline (× 1,000)

Use the buttons to insert numerals at the cursor. An overline multiplies the value by 1,000: X̅ = 10,000.

  • I: 1
  • V: 5
  • X: 10
  • L: 50
  • C: 100
  • D: 500
  • M: 1000

About Roman Numerals

Convert decimal numbers to Roman numerals and Roman numerals to decimal numbers.

How it works

The tool converts between decimal numbers and Roman numerals. An overline multiplies a numeral by one thousand.

How to use

  1. Enter a decimal number to convert.
  2. Or enter Roman numerals using the buttons.
  3. Read the equivalent number.

Practical example

X is 10 and X̅ is 10,000.

Useful tips

Follow valid Roman numeral sequences. The supported range is 1 through 3,999,999.