1 in Roman Numerals
One is where the whole system starts. A single stroke, I, with nothing added or taken away. You meet it first on every clock face and in the opening chapter of anything numbered the old way.
How I is formed
Reading left to right, 1 breaks into these additive parts. Each Roman symbol is added in turn to reach the total.
I = 1 = 1.
Where 1 in Roman numerals is used
- Hour 1 on a clock or watch face, shown as I.
- Chapter, act or appendix numbering in books and plays.
- Super Bowl I and other numbered championship events.
- Outlines, exam questions and list items in formal documents.
Good to know about 1
- On a clock or watch face, 1 o'clock is shown as I.
- Super Bowl I was played in 1967; the NFL numbers its championship in Roman numerals (with the one-off exception of Super Bowl 50).
Convert another number
1 is written I in Roman numerals.
Frequently asked questions
How do you write 1 in Roman numerals?
Write 1 as I, combining I. Start from the largest value that fits and work down until nothing is left over.
Is I the 1 you see on a clock?
Yes. 1 o'clock is written I on Roman-numeral clock and watch faces, with the one quirk that many dials print four as IIII rather than IV out of tradition.
Which Super Bowl is I?
Super Bowl I is the 1st Super Bowl, played in 1967. The NFL sets its championship number in Roman numerals, which is why so many people look up values like I.
What number is I?
I is 1. Read the symbols left to right, treat any smaller-before-larger pair as a single subtraction, and add the groups together.