Most standard kitchen cabinets are about 24 inches deep for the lower (base) cabinets and about 12 inches deep for the upper (wall) cabinets, not counting the countertop overhang.

Quick Scoop

  • Base cabinets: usually 24 inches deep from the wall to the front of the cabinet box.
  • With countertop: the depth typically ends up around 25–26 inches because the countertop overhangs the cabinet slightly.
  • Wall (upper) cabinets: most commonly about 12 inches deep so they don’t stick too far over the counter, though some designs go up to 24 inches (for example, over a refrigerator).
  • Interior depth of a 24‑inch base cabinet is often around 23 inches, allowing for the cabinet back and door thickness.

Other common variations

  • Shallower base cabinets (18–21 inches) are used in tight or galley kitchens to keep walkways clear.
  • Tall pantry or utility cabinets are typically 12 or 24 inches deep to line up with wall or base cabinets.

If you’re measuring your own kitchen, remember that what you touch in front is usually the countertop, which sticks out a bit more than the cabinet box itself.

TL;DR: When people ask “how deep are kitchen cabinets,” they almost always mean base cabinets, which are typically 24 inches deep, plus about an extra inch or so for the countertop overhang.

Information gathered from public forums or data available on the internet and portrayed here.