Diablo 2 Resurrected Calculator has not been completed due to lack of easy data availability (There is no API for diablo 2 resurrected at this moment atleast from what I've found out) and because of that, it didn't even make sense to make all features, which without data, won't work, and if I try to gather data myself, it will take ages to complete it.

Calculator just shows skilltree and skills up to 20 lvl without calculating whole synergies.
Everything works nearly the same as in diablo 2.
Maybe one day this project will be finished...

Click on desired character image on top of the website, then set your level and click LMB to add points or RMB to remove points.

Pay attention to skilltree pathing.
Holding ctrl increases adding or removing points by 10.