Both the number of cups of coffee you get out of 200g of Nescafe and the number of washes you get out of 1 kg of washing powder will vary (depending on how you

Both the number of cups of coffee you get out of 200g of Nescafe and the number of washes you get out of 1 kg of washing powder will vary (depending on how you strong you like your Nescafe and how dirty your clothes are). The same is true for deodorant or shower gel. I think weight/volume measurements are fine for almost everything. Packages for things like dishwasher tabs usually have a number on them (in addition to weight/volume, which is mandated to be on the packaging).