We list dimensions as length × width × height in centimetres, and capacities in millilitres or litres — the same units on every product page, so two tools are always comparable.
For anything that holds food or liquid, the capacity is the usable fill, not the brim: a 1L container really takes a litre without spilling.
Apparel has its own size chart on the product page, with the garment's flat measurements — measure a top you already like and match it, rather than guessing from a label.
Not sure a tool fits your drawer, your pan or your hand? Email hello@yummytummy-shop.com with what you're working with and a real human will tell you straight.