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Monday, March 9, 2026

Roman Numeral Converter

Roman Numeral Converter

Convert standard numbers into ancient Roman Numerals. Great for checking copyright dates on movies, reading historical monuments, or learning Latin notation.

Roman Notation
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I1
V5
X10
L50
C100
D500
M1000

The Rules of the Romans

Roman numerals are based on seven symbols. They follow an additive principle (like VIII for 8) and a subtractive principle (like IV for 4). Generally, you cannot place more than three of the same symbol in a row; instead, you subtract the smaller value from the larger one next to it.

Frequently Asked Questions

Why is the limit 3,999? +
Standard Roman numerals don't have a single character for numbers larger than 1,000 (M). To write 4,000 and above, ancient Romans used a "vinculum" (a bar over the letter) to multiply values by 1,000, which is difficult to display in standard text.
Is there a zero in Roman numerals? +
No. The Roman numeral system was developed for counting and trade, and they did not have a symbol for "nothing" or zero. The concept of zero as a placeholder was introduced to Europe much later.
How do subtractive rules work? +
Only power-of-ten symbols (I, X, C) can be used for subtraction. I can subtract from V and X. X can subtract from L and C. C can subtract from D and M.

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