These are great charts that will help you determine the number of grams of protein that you should be striving to consume each day. NX Labs the maker of ISO XP have provided these charts to help you out. Find the weight range and gender that you fit into and look across to see the number of recommended grams of protein per day you should be consuming. You'll notice that the suggested intake of protein from Whey Protein makes up half of your recommended daily intake of protein. The other half should come from whole food sources such as:
Seeds & Nuts
The great thing about protein powder is the convenience of it and the taste. It's like drinking dessert multiple times a day and who doesn't like that? honestly... Another added benefit to whey protein (Isolate in particular) is its quick absorption profile that accompanies it which your metabolism can digest relatively quickly.
If you fall in between the chart in terms of weight, you can simply use the formula of 1 pound of body weight equals 1 gram of protein recommended per day. It's that simple :) Happy eating