If you go to the my recipes section you can add your own weights and amounts/recipe it takes a little time weighing everything out and you also have to add the amount of portions you expect to get from the dish you are making. I've done it a few times it can be useful if you eat the food regularly and the ingredients remain the same. I cook pretty much always from scratch but I tend to weigh as I go and something like cottage pie with mixed ingredients I guesstimate.