Thanks for the comments so far.
I think it’s good to have an idea of how much weight gain is necessary in comparison to my lifting progress. [/quote]
What I wrote does not mean that.
E.g., a person can move up from Class III to Class II to Class I to Master or even up to Elite all in the same weight class.
That represents improved strength-for-weight of course.
What I gave you above was the easier task of strength-for-weight remaining the same.
I was not saying that strength cannot improve faster than that: that it is necessarily necessary to gain that weight to gain that strength.
By no means should one think, “Well, my strength cannot go up much because my weight hasn’t gone up that much.”
For example you might (it will depend on the person and the time) be able to add say 10% to a major lift such as squat or deadlift, and this will AID you in adding muscular bodyweight, but it is not as if it cannot happen until your bodyweight goes up 10%. Feeling that it can’t would be underestimating what you can do and setting low standards.
Unless of course you’re already at a level like Master: in that case, to add another 10% strength (for example) and wanting to do it in a relatively short time, it is reasonable to figure that adding another 10% or a little more bodyweight will likely be needed to do that relatively quickly. But that is not your situation.
For a practical example: For my first three years of training, stupidly I followed Dr Ellington Darden’t HIT prescriptions to the letter. (For a brief period, this would have been an okay thing to do). And for roughly the last year of that, can’t recall exactly, I even more dumbly followed the exceedingly wrong nutritional advice of John Parillo, who claimed that carbs cannot convert to fat. The result was a weight in the low 190s and some given modest level of strength, much improved over the starting point (about 2.5 times on average I think) but nothing to write home about.
The following training year, I slowly shed fat, having abandonded Parillo’s nutty theory, and wound up at 158 lb at 8% by skinfold and 6% by hydrostatic, with the skinfold measurement probably being about the true value and the hydrostatic being silly. And during this period I was training according to the teachings of Scott Warman as I understood them, or pretty much so.
And I was substantially stronger at the 158 than I had been in the low 190’s. Still nothing to write home about. But the point is, strength gain is not necessarily tied to bodyweight gain, or vice-versa, in individuals who have not maxed out – or even more so if they have not even come close to maxing out – their potential in strength-for-weight.