23 in Roman numerals is XXIII, built from XX + III (XX = 20, III = 3), which add up to 23.
How 23 is written in Roman numerals
The number 23 is written XXIII 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 XXIII step by step — take the largest value that fits, write its symbol, subtract, repeat.
| Write | Value | Remaining before | Remaining after |
|---|
| X | 10 | 23 | 13 |
| X | 10 | 13 | 3 |
| I | 1 | 3 | 2 |
| I | 1 | 2 | 1 |
| I | 1 | 1 | 0 |
Where you see XXIII
Regnal and papal names use it the same way — a 23rd ruler of a name is styled XXIII, as in Louis XXIII or Pope John XXIII. The 23rd Super Bowl was Super Bowl XXIII; the NFL has used Roman numerals for every edition except Super Bowl 50.
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Frequently Asked Questions
What is 23 in Roman numerals?
23 in Roman numerals is XXIII. Reading it left to right gives X (10) + X (10) + I (1) + I (1) + I (1) = 23. The number below it, 22, is written XXII, and the number above it, 24, is written XXIV.
How do you write 23 in Roman numerals?
Write 23 as XXIII, combining X (10) + X (10) + I (1) + I (1) + I (1). Roman numerals are built by taking the largest value that still fits, writing its symbol and subtracting it, which reduces 23 in 5 steps: X leaves 13, X leaves 3, I leaves 2, I leaves 1, I leaves 0. Every symbol keeps the same value wherever it stands, so the order is fixed and XXIII is the only standard spelling of 23.
Which letters make up XXIII?
XXIII is made up of X twice and I three times. X is worth 10 and I is worth 1. Added together those values come to 23, because Roman numerals are read by summing the symbols from left to right.
Will the Roman numeral converter accept XXIII?
Yes, type XXIII into the Roman numeral converter and it returns 23. 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 23.