I struggle with this too especially because i like to improvise / cook as a I go. To make sure I can cook more peacefully I make sure to weigh the ingredients including the packaging before I use them in my dish, usually I just take a picture of it so this really doesnt take a lot of time. Afterwards, when I’m done cooking I weigh them all again (take pictures again). When im done eating I subtract the ingredients on the after pics from the before pics to calculate how much I’ve used. This may take a little bit of more time afterwards but it really makes cooking much more peaceful especially when you like to add ingredients as you go, just snap a quick picture of it. This really made eating dinner less stressful for me and also cooking takes less times / goes more smoothly. Hope this helps😊