Using pound hou to calculate his strenght.
Pre Time skip Zoro==>
1 Sword=36 pound hou, 2 Sword =72 pound hou, 3 Sword=108 pound hou.
Aqualaguna feat=300 pound hou
Asura Zoro 108 x 3 =324 pound hou>300 pound hou meaning Asura Zoro pre Time skip has the strenght to accomplish that feat alone.
Post Time skip===>
1 Sword style become=360 >324 post Time skip Zoro Can casualy acomplish Aqua laguana feat in base.
2 swordstyles=720 , 3 Sword styles=1080 Was able to slice through montains+ level Pica easily.
Asura Zoro 1080 x 3 = 3240 pound hou, Post Time skip Asura has the Strenght of 3240 pound hou, this attack is si strong it Can cut through a landscapes (a conbination of montains,rivers, forest and anything else that Can be find on an Island Aka a great portion of it).
Post Wano Zoro===>
With the confirmation that they are 100x stronger
Current Zoro is capable to easily cut through landscapes because his KoH pound hou should be around 3600 >rooftop Asura 3240 pound hou.
3600 x 3 = 10800 pound hou far more than enough to easily Split an island.
KoH Asura=10800 x 3 =32400 pound hou should be able to completely erase an island Level target outa of existante not just cut it.
To sum UP.
pre Time skip Zoro Can slice through a tidal wave like Aqualaguna alone
post Time skip Zoro Can slice though landscapes
- current Zoro had the power to erase an island sized target outa of existance not just merely cut it.