How big should a hamster cage be?

The recurring consensus across r/hamstercare, r/hamsters and hobbyist forums is a minimum of roughly 100x50cm (about 620 square inches) of continuous, unbroken floor space, with more being better. Several smaller acrylic and 360-viewing tanks in this category are repeatedly flagged by those same communities as too small, so prioritize floor area over height or tube add-ons.