M is a single Roman symbol group for 1000.
How 1000 is written in Roman numerals
The number 1000 is written M 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 M step by step — take the largest value that fits, write its symbol, subtract, repeat.
| Write | Value | Remaining before | Remaining after |
|---|
| M | 1000 | 1000 | 0 |
Where you see M
Written as a year, 1000 appears as M on cornerstones, film credits and copyright lines — the convention that keeps Roman numerals in daily use.
Nearby numbers
Popular numbers in Roman numerals
Frequently Asked Questions
What is 1000 in Roman numerals?
1000 in Roman numerals is M. It is written as one value group, M, worth 1000 on its own, so nothing has to be added to it. The number below it, 999, is written CMXCIX, and the number above it, 1001, is written MI.
How do you write 1000 in Roman numerals?
Write 1000 as M, a single Roman symbol group worth 1000. Roman numerals are built by taking the largest value that still fits, writing its symbol and subtracting it, which reduces 1000 in 1 step: M leaves 0. Every symbol keeps the same value wherever it stands, so the order is fixed and M is the only standard spelling of 1000.
What are the Roman numerals either side of 1000?
Either side of 1000 the Roman numerals are CMXCIX for 999 and MI for 1001, with M between them. Those three numerals are 6, 1 and 2 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.
How is M read out loud?
M is read as the number it stands for, one thousand, and never letter by letter. Roman numerals are a way of writing values rather than a separate set of names, so the spoken form is the same whether the page shows 1000 or M. A chapter or volume numbered M, for instance, is simply chapter one thousand.