It's 200 blocks in the x and z directions.

 

So true... double checked my islands, 99x99 is actually that size, 149x149 is actually that size, but yeah 199x199 is actually 200x200

Imagine all you could do with one extra block! I support this although wouldn't say its a huge deal lol

 

Isn't it something with the bedrock not being counted?

 

Hear me out:
We LEAVE it at 199x199 so when they decide to measure it themselves and discover the one extra block on each side, they will be like "NOICE one extra block on each side" and it will be a little bonus to their day.

 

Yeah I'm under the assumption that its not counting the bedrock. Eg the smallest island you can own is 1 block. So any expansions added would be Minus-1 block. Hence the 200x200 is actually 199x199 added, otherwise you'd have a 201x201 Isle. This means that whilst yes the expansion should be 200x200, you already have that 1st block so the store isn't purchasing you that bedrock block space. The store is offering the remaining blocks.

 

But here's the thing: 99x99 and 149x149 count the bedrock...

 

I dont think it does..?

99x99:
radius is 50, thus 100x100 is accessible, yet its called 99x99


149x149:
radius is 75, thus 150x150 is accessible, yet its called 149x149


same for 199x199....
radius of 100, 200x200 accessible... called 199x199

 

99x99:
99x99 is accessible
149x149:
149x149 is accessible
199x199:
200x200 is accessible.

 

You see how it says in your picture: buildable (65951, -14449) - (66049, -14351)?
66049 - (65951 - 1) = 66049 - 65950 = 99 blocks buildable
-14351 - (-14449 - 1) = 99 blocks buildable

(-12274, -10874) - (-12126, -10726)
-12126 - (-12274 - 1) = 149 blocks buildable
-10726 - (-10874 - 1) = 149 blocks buildable