Kitchen Cabinet Sizes Are Standard, but Walls Aren't
On a 146-inch wall, 144 inches of cabinets leave 2 inches for fillers at the corners, where walls run out of square and doors need knuckle room at returns.
Every stock kitchen in North America is built from the same dimensional system. Learn five numbers and the 3-inch module, and any layout becomes arithmetic.
Base cabinets
34½” tall × 24” deep, which lands countertops at the canonical 36” after a 1½” top. Widths run 9” to 48” in 3-inch steps — the module that makes mixing brands possible. Special citizens: sink bases (30–36”, false-front), corner solutions (36” blind or 33–36” lazy susan), and drawer bases (12–36”, the most cost-per-inch you’ll spend and the storage you’ll use most).
Wall cabinets
12” deep (13” nominal with the door on some lines), widths on the same 3-inch grid. Heights are the design decision: 30” classic with a soffit, 36” standard today, 42” to the ceiling in 8-foot rooms. Mounting convention: bottoms at 54” off the floor — 18” of backsplash above the counter. Over appliances: 12–15” tall units above fridges, microwave cabinets at 15–18”.
Tall cabinets
84”, 90”, or 96” heights, 24” deep for pantry/oven units, 12” for broom storage. An 84” tall aligns with 30” walls-plus-soffit; 96” runs to an 8-foot ceiling exactly.
The clearances that make it a kitchen
- 42” work aisles (48” in two-cook kitchens); 36” walkways elsewhere
- Dishwasher within 36” of the sink edge; landing counters of 15”+ beside the fridge and 12”/15” flanking the cooktop
- 30” clearance cooktop-to-hood (check the hood’s spec)
- Islands need 42” on working sides — the island that “just fits” doesn’t
Reading a plan like a maker
Runs are dimensioned in fillers: a 146” wall holds 144” of cabinet plus a 2” filler split at the corners, because walls are never square and doors need knuckle room at returns. A plan with zero fillers wasn’t drawn by someone who has installed one — the 3-inch module builds the kitchen, and the fillers make it fit the house.