One Piece planet size

I'll be using the Number of Islands method to do this as accurately as possible.

 In chapter 964, a young Marco says that there are over 20 000 000 islands in the world, even saying that the number of islands impossible to count. Therefore, we will use 20 000 000 as a lowball.

Of course, the credibility of this statement will be brought into question, and so I will clear that up real quick.

Although we know little about Marco himself, we do know that he enjoys cartography and geography. Why?

In his Vivre Card, we know that during his childhood or 子供のころ, he studied nautical maps and was very interested in the subject.

幼少期に海図の勉強もしており、戦闘以外に知識でも隊を支えていた。

translates to…

“He also studied nautical charts when he was a child and supported the group with knowledge as well as combat.”

So, a man passionate about cartographer and maps, and likely the main navigator of a Yonko crew, is quite the reliable source in terms of information about One Piece’s geography.

Now, let us move on to the methodology of the calc. First, I will be taking the average size of our world and multiple it by 20 000 000 to get the minimum amount of space needed for the islands to exist on the planet.

https://en.wikipedia.org/wiki/List\_of\_islands\_by\_area

I will be using this list of islands to get the average.

Using this Excel file, I found that the average island size is 30 062 km². Now to multiply that my 20 000 000.

30 062 x 20 000 000 = 601 240 000 000 km² of land mass

Judging by this image of the planet from the Vivre Cards, the Red Line would make up about 15% of the planet. This would leave the 85% of the space for the land of islands and the actual water. Given that the One Piece planet is a lot more water than our own,

https://www.usgs.gov/special-topic/water-science-school/science/how-much-water-there-earth?qt-science\_center\_objects=0#

and our own planet is around 71% water, let us use 90% of the 85% is water. So, 76.5% is water. This means that 8.5% of the planet is island land mass.

To review, One Piece’s planet is…

15% Red Line

76.5% Water

8.5% Island Land Mass

Now, to turn these percentages into surface area.

8.5% = 601 240 000 000 km²

1% = 70 734 117 647.0588235294117647 km²

100% = 7 073 411 764 705.88235294117647 km²

https://www.calculatorsoup.com/calculators/geometry-solids/sphere.php

Using this, we would have…

A surface area of 5 110 540 000 000 000 000 m²

A volume of 1 768 956 790 000 000 000 000 000 000 m³

A radius of 750 256 105 m

A diameter of 1 500 512 210 m

A circumference of 4 713 998 140 m

https://solarsystem.nasa.gov/solar-system/sun/by-the-numbers/

Looking at these numbers, this means the One Piece planet is 84% the size of our Sun.

However, there is another way of calculating the One Piece planet’s size I find to be more accurate as it’s not as assumptive and uses what the series not only has stated, but shown.

It is important to note is that the islands are extremely far apart. We know this because of Long Ring Long Land.

 Long Ring Long Land is actually one ring-shaped island whose peaks become separated into ten smaller islands. However, these “islands” are separated so far from one another,

that we do not see them at the horizon at even dozens of meters in the sky. This means these “islands” are even farther than the horizon. Note how this is all the same island. Separate islands are even farther apart than that.

https://en.wikipedia.org/wiki/Horizon

https://aty.sdsu.edu/explain/atmos\_refr/horizon.html

Using the formula seen here,

d = √2hR

d = Distance in km

h = Height in m

R = Radius in km

I’ll use this formula to determine the horizon distance of the One Piece planet. I will be using the radius I received from above to act as the approximate radius considering it would have to be around that size given everything the story has told us.

Luckily, the lovely Wade Strine scaled the trees for me.

Average Pirate/Person: 8 Pixels

Trees: 203 Pixels

https://www.medicinenet.com/height\_men/article.htm

Average male is 1.76 m.

1.76/8 = 0.22 m Per Pixel

(0.22)(203) = 44.66 m

As we are far above the trees, we’ll go with 75 m for a decent lowball.

d = √2(75)(750 256.105) = 10 608.412499049987451 km or 10 608 412.499049987451 m

This is the distance between the peaks of Long Ring Long Land. We’ll use this as a lowball for the distance between all islands.

I will order the 20 million islands in a way that I can determine the water mass of the One Piece planet. I will do so by creating a square in which the distance between islands acts as the length and the amount and diameters of the islands act as a width.

 Using the average island size I got in the Excel file, 30 062 km², I’ll get the average diameter of each island.

Assuming the islands are circle shaped, I’ll use this calculator,

https://www.sensorsone.com/circle-area-to-diameter-calculator/

to get a diameter of 195 642.856 m.

Multiplying the diameter to the number of islands gets me,

(195 642.856)(20 000 000) = 3 912 857 120 000 m

Now, for the surface area of water.

(10 608 412.499049987451)(3 912 857 120 000) = 41 509 202 378 804 736 633.55600112 m²

This would be the total amount of m2 of water in between islands and using the percentages I stated above, this would be our 76.5%.

41 509 202 378 804 736 633.55600112 = 76.5%

1% = 542 603 952 664 114 204.3602091649673203 km²

100% = 54 260 395 266 411 420 436.02091649673203 m²

This would mean the One Piece planet is 8.93910959907931144 times larger than our Sun.

https://www.calculatorsoup.com/calculators/geometry-solids/sphere.php

Using this calculator again, we get...

A surface area of 54 260 395 266 411 420 436.02091649673203 m²

A volume of 37 583 588 400 000 000 000 000 000 000 m³

A radius of 2 077 956 940 m

A diameter of 4 155 913 880 m

A circumference of 13 056 188 500 m

http://www.stardestroyer.net/Empire/Tech/Beam/Calculator.html

Putting the numbers of

Planetary Diameter = 4 155 913.88 km

Surface gravity = 1 g

Height of observer = 75 m

we get the following numbers.

Planetary volume =  3.758E+28 m³

Surface gravity = 1 g

Surface area = 5.426E+19 m²

Distance to horizon =  558.3 km (which doesn't make sense given the above formula)

Mass = 6.346E+29 kg

Average density = 17 kg/m³

Surface escape velocity = 201.9 km/s

Death Star yield LL = 7.758E+39 J

Death Star yield UL = 1.370E+50 J

Calc by: **Lustful#6996**