Roman Numerals to Number Converter

Decode Roman Numerals in Seconds

Reading Roman numerals shouldn't require a history degree. Whether you're trying to figure out which Super Bowl just aired, deciphering the copyright year on an old movie, or reading the inscription on a historic monument, our free Roman Numerals to Number Converter makes it effortless. Simply enter the letters, and we instantly translate them into modern Arabic numerals.

Why Use This Tool?

Roman numerals use a complex system of addition and subtraction (e.g., IX is 9, but XI is 11). Doing this mental math for long strings like MDCCLXXVI is prone to error. Our tool automates the process, strictly adhering to standard rules to ensure your translation is 100% accurate. It handles everything from simple digits to complex dates.

How to Use the Roman to Number Converter

1. Input Data: Type the Roman numeral (e.g., MMXXV) into the input box. Capitalization doesn't matter; the tool handles it for you.
2. Convert: Click "Convert to Number" to process the text.
3. Result: The numeric value appears immediately below.
4. Copy: Hit "Copy Number" to save the result to your clipboard for use in your documents or research.

Frequently Asked Questions About Roman Numerals

How do you convert Roman numerals to numbers?

Read the symbols from left to right. Assign each letter its value (I=1, V=5, X=10, L=50, C=100, D=500, M=1000). If a smaller value appears before a larger one (like IV), subtract it. Otherwise, add the values together.

What does XXVIII mean in numbers?

XXVIII represents the number 28. It is calculated by adding the values in descending order: X (10) + X (10) + V (5) + I (1) + I (1) + I (1) = 28.

Why is 1999 not written as MIM in Roman numerals?

Standard Roman numerals follow strict subtractive rules. You cannot subtract I from M. Instead, 1999 is broken into 1000 (M), 900 (CM), 90 (XC), and 9 (IX), resulting in MCMXCIX.

What is the Roman numeral for 2025?

The year 2025 is written as MMXXV. This combines MM (2000), XX (20), and V (5).

Why did people stop using Roman numerals?

Roman numerals lack a zero and a place-value system, making complex arithmetic like multiplication and division extremely difficult. The Arabic numeral system we use today is far more efficient for mathematics and trade.