Target weight

Body Mass Index is a generally accepted way to look at how your height and weight should relate to each other. BMI is the ratio of your weight to the square of your height

An ideal BMI for an adult male is someplace in the range of about 20.7-28.4.

Using the upper end of that range you can estimate a target weight (including a factor for conversion between feet/pounds and metric measurements) as

W = .0404 * H²

where H is your height in inches.

For me, at 68 inches, that gives a target weight of about 186 pounds.

Ideally I think I should probably weigh in less than that, but it provides a good target at the upper range of acceptable weight for me.