Cooking for 2

I use the recipe builder when I cook for my husband and I, weigh the ingredients as I go and then weigh the entire dish afterward in grams and change the number of servings to the number of grams. I then get my portion in grams afterward and it works well if I eat leftovers for lunch the next days as I can get an accurate amount then too. Or if I made a big batch of chili, I know how many calories I'm eating even if it's been in the freezer for a few weeks after I made it.

That's pretty much what I do, too, especially when it's not something I'm planning on making again so it doesn't make sense to do a recipe. For big-batch things that I freeze portions of later, recipe builder is awesome, but, for example, if a friend gives me some organic grass fed beef from their ranch, for example, I'm not likely to have that meat in the house often enough to build a recipe or anything. Or if something comes in the organic veggie box that I'd never buy on my own, I just weigh everything that goes in, write it down, then divide it out.
My husband is counting his calories and tracking intake, too, and has a much stricter dietary requirement when it comes to carbs than I do, so I have to make sure we're both getting our requirements met.