Upper Cabinet Height
How high should wall cabinets be mounted?
Vertical Elevation Standards
Standard mounting height is 18" above the countertop (54" from the floor). For taller homeowners or those with large countertop appliances (e.g., professional mixers), 20" to 22" of clearance is often specified.
The industry-standard 18" gap between the countertop and the bottom of wall cabinets for appliance clearance.