Number
1 in Roman numerals
1 is written I
Type any other number or numeral below to convert it.
Above 3,999? Type the barred part in brackets, e.g. (IV)CC = 4,200.
How I is built
Roman numerals are written one decimal place at a time, largest first.
- Iones · 1I is 1.
About the number 1
- One is neither prime nor composite. In Roman numerals it's the single stroke I, the mark every other numeral grows from.
- I is a single letter, one of only seven in the system: I, V, X, L, C, D and M.
- On a clock face, 1 o'clock is I.
- As a month in a date, I is January.
- As a day of the month, I is the 1st. Write a date
Counting from 1 to 10
| Number | Roman numeral |
|---|---|
| 1 | I |
| 2 | II |
| 3 | III |
| 4 | IV |
| 5 | V |
| 6 | VI |
| 7 | VII |
| 8 | VIII |
| 9 | IX |
| 10 | X |