Mana reserved calculator

Hello,

where I can find Mana reserved calculator? I have 800 Mana.

I'm using Clarity aura + I'd like to use Helm with these sockets:
Blasphemy + Temporal chains + Enfeeble + Enlighten lvl 3

I wonder how much unreserved mana be left. I don't want tu buy Enlighten lvl 3 just to test..
Maybe anyone could help?

https://poe.mikelat.com/