80 in Roman numerals is LXXX, built from L + XXX (L = 50, XXX = 30), which add up to 80.
How 80 is written in Roman numerals
The number 80 is written LXXX 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 LXXX step by step — take the largest value that fits, write its symbol, subtract, repeat.
| Write | Value | Remaining before | Remaining after |
|---|
| L | 50 | 80 | 30 |
| X | 10 | 30 | 20 |
| X | 10 | 20 | 10 |
| X | 10 | 10 | 0 |
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Frequently Asked Questions
What is 80 in Roman numerals?
80 in Roman numerals is LXXX. Reading it left to right gives L (50) + X (10) + X (10) + X (10) = 80. The number below it, 79, is written LXXIX, and the number above it, 81, is written LXXXI.
How do you write 80 in Roman numerals?
Write 80 as LXXX, combining L (50) + X (10) + X (10) + X (10). Roman numerals are built by taking the largest value that still fits, writing its symbol and subtracting it, which reduces 80 in 4 steps: L leaves 30, X leaves 20, X leaves 10, X leaves 0. Every symbol keeps the same value wherever it stands, so the order is fixed and LXXX is the only standard spelling of 80.
What are the Roman numerals either side of 80?
Either side of 80 the Roman numerals are LXXIX for 79 and LXXXI for 81, with LXXX between them. Those three numerals are 5, 4 and 5 letters long, so the length changes as you count. Roman numerals have no digit positions, so each step can rewrite the numeral rather than bumping a single digit.
Will the Roman numeral converter accept LXXX?
Yes, type LXXX into the Roman numeral converter and it returns 80. 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 80.