29 in Roman numerals is XXIX, built from XX + IX (XX = 20, IX = 9), which add up to 29. It uses subtractive notation: IX (10 - 1).
How 29 is written in Roman numerals
The number 29 is written XXIX 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 XXIX step by step — take the largest value that fits, write its symbol, subtract, repeat.
| Write | Value | Remaining before | Remaining after |
|---|
| X | 10 | 29 | 19 |
| X | 10 | 19 | 9 |
| IX | 9 | 9 | 0 |
Where you see XXIX
Regnal and papal names use it the same way — a 29th ruler of a name is styled XXIX, as in Louis XXIX or Pope John XXIX. The 29th Super Bowl was Super Bowl XXIX; the NFL has used Roman numerals for every edition except Super Bowl 50.
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Frequently Asked Questions
What is 29 in Roman numerals?
29 in Roman numerals is XXIX. Reading it left to right gives X (10) + X (10) + IX (9) = 29. The number below it, 28, is written XXVIII, and the number above it, 30, is written XXX.
How do you write 29 in Roman numerals?
Write 29 as XXIX, combining X (10) + X (10) + IX (9). Roman numerals are built by taking the largest value that still fits, writing its symbol and subtracting it, which reduces 29 in 3 steps: X leaves 19, X leaves 9, IX leaves 0. Every symbol keeps the same value wherever it stands, so the order is fixed and XXIX is the only standard spelling of 29.
Does XXIX use subtractive notation?
Yes, XXIX uses subtractive notation. Here IX means 10 minus 1. Without it, 29 would have to be written XXVIIII, and Roman numerals avoid a run of four identical letters wherever a subtractive pair will do.
Will the Roman numeral converter accept XXIX?
Yes, type XXIX into the Roman numeral converter and it returns 29. 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 XXVIIII is rejected rather than accepted quietly. Its working range runs from 1 to 3999, which covers 29.