Every week of Weekly Shōnen Jump since chapter 1 in July 1997. Each square is one week: a new chapter, a week Eiichiro Oda sat out, or a week with no magazine at all.
New chapter
Oda break · Jump came out without One Piece
Jump break · no issue that week
the two blues alternate from one story arc to the next; point at a week to light up its arc
Rows follow Jump's own issue numbering, so each row starts with issue 1, which goes on sale around the start of December of the year before. Columns are the weeks of that Jump year, and the two right-hand columns count chapters and Oda breaks.
Most Oda breaks are a single issue. These are the runs of two or more issues in a row.
Issues missed
Weeks of
Length
How to read it
Oda break means that week's Jump was printed and One Piece was not in it, whatever the reason: a scheduled rest, research, illness or surgery.
Jump break means there was no issue to be in. A few times a year, usually around New Year, Golden Week and Obon, Jump prints a double issue that stays on sale for two weeks; the second week is the hollow square.
Two Jump breaks had other causes: issue 17 of 2011 was held back a week after the Tōhoku earthquake, and issue 21 of 2020 was pushed back a week after a COVID-19 case in the editorial department. Neither week used up an issue number, so later issues in those two rows sit one column further right.
Week dates are the Monday of the issue's regular slot. When that Monday is a public holiday the issue goes on sale a day or two either side, and in the series' early years Jump came out on Tuesdays.
Arc by arc
A break is counted with the arc of the chapter that followed it. Point at a row to find the arc in the chart.
Arc
Chapters
Count
First chapter
Last chapter
Oda breaks
Year-by-year table
Jump year
Issues
Chapters
Chapter numbers
Oda breaks
Jump breaks
Where the data comes from, and how it was checked
Nothing here is estimated. Every square was placed from an issue-by-issue record and then compared against at least one other source.
1997 to mid-2017: the tables of contents of all 962 Jump issues in Japan's Media Arts Database (open dataset, processed for this chart). The chapter numbers recorded for those issues run from 1 to 872 without a gap, apart from six misprinted numbers and one missing entry in the database. Compared against Jajanken's One Piece index chapter by chapter up to 2008, and issue by issue for 2011, 2014 and 2015.
Mid-2017 to 2021:Jajanken's issue pages, compared against Claystage's yearly schedules for 2019 to 2021, which agree on every issue. For 2017 and 2018 the chapter numbers and the yearly totals were the second check.
Yearly totals were compared with One Piece.Log's count of breaks per year. 26 of 29 years match. For 2011, 2014 and 2015 that count differs by one; the issue pages for those years support the numbers shown here.