1 in Roman Numerals
1 is written as I in Roman numerals.
How I is built
Roman numerals are written one place value at a time, largest first. 1 splits into 1 (ones), and each piece becomes its own group of symbols:
| Symbol | Value | Running total | Note |
|---|---|---|---|
| I | 1 | 1 |
Read left to right, the symbols add up: 1 = 1. I needs no subtractive pairs: every symbol in it is simply added, because no place value of 1 is a 4 or a 9.
The symbol I (1) is the largest one used to build I -- it also shows up in 79 other numbers between 1 and 100.
Frequently Asked Questions
What is 1 in Roman numerals?
1 in Roman numerals is I. It is built from 1 symbol group: I (1).
How do you write I as a number?
Add the symbol values left to right, subtracting whenever a smaller symbol sits before a larger one: 1 = 1.
Does I use subtractive notation?
No. None of the place values of 1 is a 4 or a 9, so every symbol in I is simply added.
What comes before and after 1 in Roman numerals?
0 is I and 2 is II. Counting up in Roman numerals changes only the lowest place until it rolls over, the same way decimal digits do.
How long is I compared to other numbers near 1?
I is 1 character long. Roman numerals don't get longer in a straight line with the number they represent -- I (0) is 1 character and II (2) is 2 characters, because each number is rebuilt from scratch out of the largest symbols that fit, not incremented digit by digit.
More Number Conversions
- Roman Numeral Converter (convert any number)
- Factors of 1