Measure your usual serving
Start with the drink you actually make. A latte made in a small home cup and a large takeaway-style drink can need very different glasses. The word “latte” on a product page is useful for finding ideas, but it does not tell you whether your recipe will fit.
For example, Judge sells a 275ml latte set, while ZWILLING lists a 350ml latte set. Neither capacity is the universal correct choice. Your preferred amount of coffee, milk and foam is the more useful starting point.
Make your normal drink in the cup you already use. Note its finished level, then later measure an equivalent amount of cold water in a measuring jug. This gives you a practical reference without changing your recipe to suit a product photograph. If you are choosing for several people, repeat the exercise for the largest drink you regularly serve.
Leave usable room
Treat the advertised capacity as a comparison figure, rather than a promise that you will comfortably carry that amount filled to the rim. Leave the room you need for foam, stirring and moving the glass. If you like iced drinks too, check those separately with your usual quantity of ice.
Compare measurements in millilitres where possible. If a listing provides only ounces, check which measurement system it uses rather than relying on a familiar-looking number.
Finally, compare external height as a separate decision. A glass can hold more by being wider, taller, or both. Your shortlist should therefore pass two tests: enough room for your drink and enough clearance in your kitchen setup.
Check shape separately
A useful shopping note is simply: “my usual drink volume, my maximum height, and my preferred grip.” Those three details will narrow the choice more effectively than a generic “large latte glass” search.