17 in Roman numerals is XVII, built from X + V + II (X = 10, V = 5, II = 2), which add up to 17.
How 17 is written in Roman numerals
The number 17 is written XVII 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 XVII step by step — take the largest value that fits, write its symbol, subtract, repeat.
| Write | Value | Remaining before | Remaining after |
|---|
| X | 10 | 17 | 7 |
| V | 5 | 7 | 2 |
| I | 1 | 2 | 1 |
| I | 1 | 1 | 0 |
Where you see XVII
Regnal and papal names use it the same way — a 17th ruler of a name is styled XVII, as in Louis XVII or Pope John XVII. The 17th Super Bowl was Super Bowl XVII; the NFL has used Roman numerals for every edition except Super Bowl 50.
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Frequently Asked Questions
What is 17 in Roman numerals?
17 in Roman numerals is XVII. Reading it left to right gives X (10) + V (5) + I (1) + I (1) = 17. The number below it, 16, is written XVI, and the number above it, 18, is written XVIII.
How do you write 17 in Roman numerals?
Write 17 as XVII, combining X (10) + V (5) + I (1) + I (1). Roman numerals are built by taking the largest value that still fits, writing its symbol and subtracting it, which reduces 17 in 4 steps: X leaves 7, V leaves 2, I leaves 1, I leaves 0. Every symbol keeps the same value wherever it stands, so the order is fixed and XVII is the only standard spelling of 17.
Which letters make up XVII?
XVII is made up of X once, V once and I twice. X is worth 10, V is worth 5 and I is worth 1. Added together those values come to 17, because Roman numerals are read by summing the symbols from left to right.
Will the Roman numeral converter accept XVII?
Yes, type XVII into the Roman numeral converter and it returns 17. 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 17.