Under-Counter Fridge Dimensions: What Size Fits Your Cabinet Opening?

Typical sizes by type run like this. Exact figures vary by a fraction of an inch from unit to unit, so treat the table as ranges.

The 15-inch and 18-inch widths are separate classes. Real 18-inch units are compact, under-counter or beverage models, and the under-counter all-refrigerators among them hold roughly 2.7 to 3.7 cu ft. A 20-inch under-counter unit is a niche size of about 3.2 to 3.4 cu ft.

In metric, 24 in is about 61 cm. Wider commercial-style units exist but are outside this guide.

The height comes from the counter. Units are sized for a standard 36-inch counter, which leaves a small gap above for leveling and airflow.

Adjustable leveling feet change the final height by a small amount, which helps on uneven floors. Cutout heights run about 34 to 35 inches. One 24-inch example calls for an opening 34 5/8 in high, 24 in wide and 24 in deep.

Counters built lower for accessibility leave very little room above a unit this tall. Check the unit's minimum height with the feet fully lowered before you commit, and measure your actual counter rather than assuming 36 inches.

Each width class suits a different kind of spot.

15-inch models

This is the narrowest option, made for slim gaps between cabinets. It also has the least storage, so it suits a few drinks or snacks.

18-inch models

This is the usual fallback for tight under-counter spots. Capacity for under-counter all-refrigerators runs roughly 2.7 to 3.7 cu ft. Only front-venting units can sit flush in a cabinet run.

24-inch models

This is the most common size, with the widest choice of door styles, finishes and drawer formats. It holds more than the narrower classes, so compare the cu ft figure on each unit.

Refrigerator drawers

Drawers are 24 inches wide. With no door swing and a low reach, they suit island aisles where a door would be in the way.

Build the opening from the cutout dimensions in the installation guide. Handles, hinges and door swing add to the overall size, so the exterior can run deeper than the cutout.

Panel-ready units take a custom cabinet panel on the door, so account for the panel thickness and the hinge points. Keep the cabinet shop's panel spec sheet and buy extra panel blanks. When the fridge is replaced years later, the new model's panel dimensions and hinge points may not match, and an aged wood finish is hard to reproduce.

Some built-in under-counter models have a non-reversible door, so the hinge side is fixed. Confirm this before the cabinet is built.

Front-vent (toe-kick) models push heat out through a grille at the bottom front. They can sit flush between cabinets with no side or rear gap.

Rear-vent models need open space behind them to shed heat. The gap is a few inches, and the installation guide gives the exact figure for each unit.

• Front-vent: grille at the bottom front, suited to built-in use, no side or rear gap.
• Rear-vent: exhaust at the back, better for open spots, needs clear space behind.

Never put a freestanding mini fridge into an enclosed cabinet. It is not designed for trapped heat, so it can overheat, which shortens its life and strains the compressor. Most compact drinks fridges are freestanding, though some slide under a countertop if the opening is tall enough. Check that the unit is rated for built-in use.

1. Measure the width between cabinets or side walls at the top, middle and bottom. Use the smallest figure.
2. Measure the height from the floor to the underside of the counter. Include any change in floor covering.
3. Measure the depth from the back wall to the front of the cabinet face. Allow for the handle and any rear-vent space.
4. Check the outlet location. It should be reachable behind or beside the unit, and may need to sit in an adjacent cabinet.
5. Check the door swing and hinge side against walls, appliances and cabinet doors.
6. For ice-maker models, confirm the water line and drain are in place before the cabinet is closed.
7. Compare your numbers with the unit's cutout figures and leave a small clearance margin.
8. Make sure the unit can get through doorways and up stairs to the room.

Leave about 24 inches of open aisle in front so a full-swing door can open. In a narrow aisle or on an island, drawers skip the swing entirely and are easier to reach.

Reversible hinges let the door swing away from a wall, but some built-in models are not reversible. Near a corner, check that the door can open past the neighboring cabinet's handles.

Pick 15 or 18 inches when width is the limit and storage needs are small, such as drinks, snacks or one user. Pick 24 inches for more capacity and the widest range of features. Choose drawers for islands and busy aisles.

Decide early between a freestanding unit and a built-in one, since that drives the venting and the cutout. A shallower, flush-fitting unit also holds less than a deeper freestanding fridge of the same width.

Match capacity in cu ft to how you use it: drinks only, everyday food or entertaining. Price varies with width, built-in rating, ice maker, panel-ready design, finish and drawer or door format. Each of those adds either capacity, a custom look or a convenience feature.