CDI in Numbers

The Roman numeral CDI equals 401.

How CDI breaks down

CDI is built by adding these Roman numeral groups together:

Add them up: CD + I = 401.

Nearby values

How Roman numerals work

Roman numerals use seven letters, each with a fixed value: I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, and M = 1000. Numbers are formed by combining these symbols and adding their values, working from the largest to the smallest.

When a smaller symbol appears before a larger one, it is subtracted instead of added — this is the subtractive rule. For example, IV is 4 (5 − 1) and IX is 9 (10 − 1). The same idea gives XL (40), XC (90), CD (400), and CM (900). The same symbol is never repeated more than three times in a row.

Roman numeral reference chart

Frequently asked questions

What number is CDI?

The Roman numeral CDI is 401.

What is the largest number in Roman numerals?

Using the standard seven symbols, the largest value is 3,999, written MMMCMXCIX. Larger numbers historically used a bar over a numeral to multiply it by 1,000.

Is there a Roman numeral for zero?

No. The Roman system has no symbol for zero; the concept of zero came later from Indian mathematics.