Roman Numeral Converter
Convert any number from 1 to 3999 into Roman numerals instantly. Roman numerals use seven letters — I, V, X, L, C, D, and M — combined according to specific rules.
Formula reviewed for accuracy. Our methodology & sources
Roman Numeral Converter
math calculator
How It Works
The converter works through the values from largest to smallest, repeatedly subtracting the biggest symbol that still fits and appending its letters until the number reaches zero. It includes the subtractive pairs — like IV for 4 and CM for 900 — so the output follows standard notation rather than writing IIII. Because classic Roman numerals have no symbol for zero and no standard form above 3,999, the tool accepts whole numbers in the 1 to 3,999 range.
Formula
I=1, V=5, X=10, L=50, C=100, D=500, M=1000
Examples
Convert 2025
2025 in Roman numerals is MMXXV.
Frequently Asked Questions
How do Roman numerals work?
Roman numerals combine seven letters. Symbols are added when a larger or equal value precedes a smaller one (VI=6), and subtracted when a smaller precedes a larger (IV=4).
What is the largest Roman numeral?
Using standard notation, the largest number is 3,999 (MMMCMXCIX). Larger numbers require a bar notation (vinculum) that multiplies values by 1,000.
Related Calculators
Fraction Calculator
Free fraction calculator. Add, subtract, multiply, and divide fractions. Get sim...
Ratio Calculator
Free ratio calculator. Simplify ratios to lowest terms, convert to decimals, and...
Average Calculator
Free average calculator. Find the mean, median, sum, min, and max of any list of...
Standard Deviation Calculator
Free standard deviation calculator. Find sample and population standard deviatio...