File:Ink Saver Main Charger Splatling Chart.png

Formula
Number of full charges = ROUNDDOWN(100/([base consumption]*(1-(0.99*x-(0.09*x)^2)/(200/3))),0)

Base consumption of full charges:
 * Bamboozler 14: 7
 * Squiffer: 10.5
 * Mini Splatling: 15
 * Splat Charger: 18
 * Heavy Splatling: 22.5
 * E-liter 3K: 30
 * Hydra Splatling: 35