Tire Inflation & Rider Weight

[Heifzilla]

My BF just sent me this:
Tire Width=20: Pressure(psi) = 0.33 * Rider Weight in lbs + 63.33
Tire Width=23: Pressure(psi) = 0.33 * Rider Weight in lbs + 53.33
Tire Width=25: Pressure(psi) = 0.33 * Rider Weight in lbs + 43.33
Tire Width=28: Pressure(psi) = 0.33 * Rider Weight in lbs + 33.33

My tires are 26x1.95 so what size is that? Inches to mm? Bike tire sizing is a new world to me at this point, kind of confusing.

Does anyone have an inflation chart for larger tires like mine?