File:Ink Saver Main Charger Splatling Chart.png

Formula
A = Ability Points = 10 &times; Mains + 3 &times; Subs

B = % change due to Ink Saver (Main) = (0.99 &times; A &minus; (0.09 &times; A)2 ) / (200 / 3)

C = ink consumption per full charge = [base consumption] &times; (1 &minus; B)

Number of full charges = 100 / C

Round the final result down to a whole number, because there is never a fraction of a shot.