Enter your mana value: 

Result:




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Note: This is accurate only when you don't use:

nv mana regen
non-class warmth
nv passive warmth
nv state mana shrine
meditation

Also, errors may occur on sorcs with points into warmth.
If you really want it, I think that having a level 99 warmth
(sorc or non-class) ~= 5 items with 255% mana regen.

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(Result may sometimes be 1% less than the cap due to rounding errors.)