11 in Roman numerals is XI, built from X + I (X = 10, I = 1), which add up to 11.
How 11 is written in Roman numerals
The number 11 is written XI in Roman numerals. Roman numerals use seven letters — I (1), V (5), X (10), L (50), C (100), D (500) and M (1000) — combined from largest to smallest, with subtractive pairs such as IV (4) and IX (9). Need another number? Use the Roman numeral converter or see the 1–100 chart.
Building XI step by step — take the largest value that fits, write its symbol, subtract, repeat.
| Write | Value | Remaining before | Remaining after |
|---|
| X | 10 | 11 | 1 |
| I | 1 | 1 | 0 |
Where you see XI
On a clock face, the 11th hour is marked XI. Regnal and papal names use it the same way — a 11th ruler of a name is styled XI, as in Louis XI or Pope John XI. The 11th Super Bowl was Super Bowl XI; the NFL has used Roman numerals for every edition except Super Bowl 50.
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Frequently Asked Questions
What is 11 in Roman numerals?
11 in Roman numerals is XI. Reading it left to right gives X (10) + I (1) = 11. The number below it, 10, is written X, and the number above it, 12, is written XII.
How do you write 11 in Roman numerals?
Write 11 as XI, combining X (10) + I (1). Roman numerals are built by taking the largest value that still fits, writing its symbol and subtracting it, which reduces 11 in 2 steps: X leaves 1, I leaves 0. Every symbol keeps the same value wherever it stands, so the order is fixed and XI is the only standard spelling of 11.
Which letters make up XI?
XI is made up of X once and I once. X is worth 10 and I is worth 1. Added together those values come to 11, because Roman numerals are read by summing the symbols from left to right.
Will the Roman numeral converter accept XI?
Yes, type XI into the Roman numeral converter and it returns 11. The converter takes only the letters I, V, X, L, C, D and M, and it re-encodes whatever you enter and compares it with the standard spelling, so a non-standard form such as IIII is rejected rather than accepted quietly. Its working range runs from 1 to 3999, which covers 11.