The appliance body is only part of the counter it consumes. Cords, doors, baskets, steam, heat, ventilation, ingredients, and cleaning space all compete for the same area.
Measure the permanent footprint
Record counter width and depth plus the clear height below cabinets or shelves. Note backsplash thickness, wall outlets, switches, under-cabinet lights, and any surface that reduces the rectangular area.
Open everything
Allow room for microwave doors, air-fryer baskets, dishwasher doors, water tanks, crumb trays, and controls. Make sure an open component does not extend across a sink, burner, walkway, or another appliance.
Follow heat and ventilation instructions
Use the manufacturer-required clearances rather than a generic rule. Do not treat an appliance fitting beneath a cabinet as proof that it can safely operate there. Consider steam, exhaust direction, and nearby heat-sensitive materials.
Protect usable prep space
A countertop appliance can technically fit while making the kitchen harder to use. Mark the area needed for a cutting board, dish landing zone, or ingredients, then decide whether the appliance can remain out or needs a realistic storage routine.