

Since I don't read the manga and I can't remember a lot of it, maybe someone
who has more extensive knowledge/understanding of One Piece world can have a
rough estimate of how big the universe/planet/ocean is, I'm just curious
because all that sea and island being wide apart and we haven't even got to
half (or quarter) of it (I guess?).

Would the One Piece planet look similar to earth's size? Or is it more
comparable to Jupiter, for example?


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one-piece
How big would the One Piece planet/universe be if looked from outer space?


As mirroroftruth
[mentioned](https://anime.stackexchange.com/questions/46799/how-big-would-the-
one-piece-planet-universe-be-if-looked-from-outer-space#comment60976_46799),
One Piece is based on real life: most characters are based on real historical
people and many places as well. For example:

  * Dressrosa = Spain

  * Wano = Japan

  * Kurohige = Edward Teach (even the name is the same)

However, it seems to me that islands are not very big so I wouldn't say the
One Piece world is as big as the Earth...


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The One Piece planet is similar to Earth not only in its Earth-inspired
character names. In [Chapter 115](http://onepiece.wikia.com/wiki/Chapter_115),
Vivi mentions the "Age of Dinosaurs" on Little Garden and Kuzan (Aokiji) has a
move called [Ice Age](http://onepiece.wikia.com/wiki/Hie_Hie_no_Mi),
suggesting that there was an Ice Age on this planet. With the exception of the
Grand Line, most of the planet experiences four seasons, regular tides, and
weather patterns similar to Earth. All of this in addition to regular days and
nights suggest that the One Piece galaxy is heliocentric.

However, the One Piece planet has [6
moons](https://i.stack.imgur.com/HB27B.png), and one of these moons has its
own moon (which is large enough itself to be a self-gravitating sphere).
Assuming the Ohara citizens were correct about their model of the planet and
that the One Piece universe has the same laws of physics as ours, their planet
is probably not Earth. Theoretically, it should be much larger but considering
imaginary logic, maybe we should just leave the physics up to our
imaginations.

I would put the One Piece planet at a similar size to Earth's for several
reasons:

  1. According to the [One Piece Timeline](https://thelibraryofohara.com/the-one-piece-timeline/) (not perfect but probably the best we can get with what we have), it took Luffy and his crew something like 75 days to get through [Paradise](http://onepiece.wikia.com/wiki/Paradise) with excursions (again, I understand that could be spot on or way off, we just can't know for certain). Earth has a circumference of ~40,000 km. The average caravel (Going Merry) speed is let's say 5 knots with a Nami navigator and Grand Line conditions. A Franky-built brig (Thousand Sunny) averages let's say 10 knots because Franky is awesome and Nami is navigating. So that means the Straw Hats traveled [Paradise](http://onepiece.wikia.com/wiki/Paradise) at an overall average of let's say 7 knots. 20,000 km / 7 knots is ~65 days without excursions and the Straw Hats knock out most of these excursions in a day or two.

  2. Apart from the Grand Line, the One Piece planet has Earth-like weather patterns and four seasons per year. Considering Luffy supposedly has a Gregorian calendar birthday ([Cinco de Mayo](http://onepiece.wikia.com/wiki/Monkey_D._Luffy)), there are 365 days in said years. Oh, also, he weighs [64 kg](https://www.absoluteanime.com/one_piece/luffy) and that's a reasonable Earth weight. He is really strong though so maybe it's a bit smaller and that's why everyone can jump really high and Luffy only weighs 64kg, apart from "because reasons," which is probably how we should be approaching this question. Now, correct me if I'm wrong but I do not believe either of these measurements are technically canon, so take all that with the same grain of salt with which you are probably taking this question and answer.

  3. The deepest part of the ocean we know about in One Piece is just below Fishman Island, which lies [10km](http://onepiece.wikia.com/wiki/Chapter_490) below sea level. Not-so-coincidentally, the deepest depth of Earth's ocean is [just over 10km](https://geology.com/records/deepest-part-of-the-ocean.shtml). Since the One Piece planet supports land and water on its crust similarly to Earth, it probably has a similar geological structure to Earth. With identical water depths, I think I can rest my case here.


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I stopped last year reading the manga in the Big Mom flashback, so I don't
know if it has been answered in the manga or not, but, in Robin flashback in
chapter 392 (episode 275), there's a planetarium of One Piece planet with the
moons.

There are 5 orbits, with 6 or more satellites. There might be another moon(s)
behind the planet, so from that, we can say that One Piece planet might be
very big than planet Earth. It might be like Saturn or even Jupiter size.

We can also see the Grand Line coming from almost the top to the bottom of the
planet and the rest are just islands. Unlike our planet, there are big lands
which are the continents, but in One Piece planet, the only big land is the
Red Line.

Here's a picture of that planetarium:

[![Planetarium on chapter 392/episode
275](https://i.stack.imgur.com/0r42o.jpg)](https://i.stack.imgur.com/0r42o.jpg)


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I would like to point out that most of One Piece (Straw Hats adventures) were
on the little part that is named Grandline, so don't forget about the Four
Seas. They may have bigger islands. Look at their size (East Blue, West Blue,
South Blue, North Blue).

![](https://i.stack.imgur.com/Ihb48.png)

So, can you take it into consideration?

Add another fact that Kuma can repel things at the speed of light, and imagine
that with that speed, it took Luffy 3 days and nights to reach Amazon Lily
while in a repel bubble that travels at the speed of light.

I say this because the Four Seas are not explored properly. So, don't base One
Piece on Grandline. That is hardly a tiny light of One Piece, about 10% of the
entire world, and it got about thousands of islands (Grandline alone), not to
mention the ones in the Four Seas.


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