Your spreadsheet is very unorganized and hard to work with, so I'll skip it for now, but I can assure you that the formula is very straightforward and quirk-free:
Base Heal = (Base Amount) + (Total AP) × (AP Ratio)
Base HPS = (Base Heal) / (Cooldown)
Total AP is the sum of all flat AP values, times all AP multipliers (Rabadon's Deathcap).
To get the Total AP I recommend using leaguecraft.com's builder to input runes/masteries/items, as I believe mobafire's has some quirks.
I'm not sure whether heal-reducing or buffing effects stack additively or multiplicatively, however.
Base Heal = (Base Amount) + (Total AP) × (AP Ratio)
Base HPS = (Base Heal) / (Cooldown)
Total AP is the sum of all flat AP values, times all AP multipliers (Rabadon's Deathcap).
To get the Total AP I recommend using leaguecraft.com's builder to input runes/masteries/items, as I believe mobafire's has some quirks.
I'm not sure whether heal-reducing or buffing effects stack additively or multiplicatively, however.
Sorry about the messy spreadsheet, it was originally made to prevent me from running calculations manually. I'm just starting to work with Excel so I really don't know too much about it. I'm sure I could "hide" a lot of the math so that all you would need to do would be to input the items, masteries, and runes. The only problem is my inexperience.
On the actual formulas, I'm glad that I got them correct.
On the actual formulas, I'm glad that I got them correct.
Thanks to The Nameless Bard and Vavena for the sigs!
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My guide is here:http://www.mobafire.com/league-of-legends/build/mad-heals-with-soraka-50699
Direct link to spreadsheet: http://www.mediafire.com/?f62hf25x2e4x5or