A 1.1 cubic feet microwave is a medium-size unit, commonly around 20 to 21 inches wide, 12 to 15 inches high, and 15 to 18 inches deep for countertop models, with low-profile over-the-range versions near 30 inches wide.
For the full breakdown, see our best 1.1 cu ft Microwave Oven guide.
A countertop microwave labeled 1.1 cu. ft. almost always has a smaller exterior than an over-the-range (OTR) model with the same interior volume. The interior cavity measures capacity, not the external footprint, so the model type decides the size. Before buying, measure your cabinet-to-cabinet width, wall-to-cabinet-front depth, and the height of the opening. The broad estimate below gets you close; your specific model’s spec sheet settles it.
What Are the Real Dimensions of a 1.1 Cubic Feet Microwave?
Most 1.1 cu. ft. countertop microwaves land near 20–21 inches wide, 11.8–15.1 inches high, and 14.4–18.4 inches deep. Low-profile over-the-range versions are much wider, running about 29 7/8 inches wide, 10 3/4 inches high, and 19 1/8 inches deep because they span a 30-inch cabinet opening above a range.
GE also identifies the JES1139WL as a 1.1 cu. ft. countertop microwave oven. The gap between these two countertop models — 20.9 inches versus 24 inches wide — shows why the cu. ft. rating alone can’t tell you the exterior size.
The table below shows typical dimensions by installation type.
| Installation Type | Typical Width & High/Dark | Typical Depth |
|---|---|---|
| Countertop (1.1 cu. ft.) | 20–21 in. wide, 11.8–15.1 in. high | 14.4–18.4 in. |
| Low-profile over-the-range | 29 7/8 in. wide, 10 3/4 in. high | 19 1/8 in. |
| Wide countertop example (GE Monogram ZEM115SJSS) | 24 in. wide, 12 1/8 in. high | 12 7/8 in. |
| Standard OTR microwave | 30 in. class width | Depends on model |
KitchenAid’s sizing guide lists low-profile over-the-range microwaves at 1.1 cu. ft. and notes the category is a little smaller than a standard over-the-range microwave, but still roomy enough for regular-sized dishes.
Over-the-Range vs Countertop: Which Fit Do You Have?
The two 1.1 cu. ft. categories are not interchangeable. A low-profile OTR unit is built for a 30-inch cabinet span and mounts above a range, while a countertop model sits on an open surface. KitchenAid says most standard microwave cutouts are 30 inches wide, and the brand recommends measuring the opening before you buy.
- Countertop: needs roughly 21 inches of width, 15 inches of height clearance, and 15–19 inches of depth. Leave a few extra inches behind and above for vents and the cord.
- Over-the-range: a 30-inch class unit designed to span the cabinet opening, with required clearance above the cooking surface.
One detail trips up more buyers than any other: door-open depth is much larger than closed depth. Add the swing arc to your clearance math or the door will strike the opposite counter. If you’ve confirmed a countertop 1.1 cu. ft. unit fits your space and want tested picks, see this roundup of the best 1.1 cu ft microwave oven models to compare wattage and features side by side.
What Most Buyers Get Wrong About 1.1 Cu. Ft. Size
Cavity volume does not equal external size. Models with identical 1.1 cu. ft. ratings can differ by several inches in width, height, and depth, so the capacity figure is never a fit guide on its own. A compact countertop 1.1 cu. ft. microwave may be far smaller than a low-profile over-the-range 1.1 cu. ft. microwave, so always check the installation type and the exact exterior dimensions.
Measure twice before ordering: cabinet-to-cabinet width, wall-to-cabinet-front depth, and opening height. Those three numbers, matched against the model’s published specs, prevent almost every fit problem.
FAQs
Will It Fit Under Standard Upper Cabinets?
Usually yes for countertop models, since most stand 12 to 15 inches tall and leave several inches of clearance below a standard 18-inch gap. Check your actual cabinet height first; some models sit near the top of that range and vents need breathing room.
Is a 1.1 Cu. Ft. Microwave Good for a Family?
It suits small households and reheats regular-sized plates and casserole dishes well. The low-profile over-the-range versions are designed to still hold standard dinnerware. Large families cooking big meals may prefer more interior capacity.
How Much Space Should I Leave Behind the Unit?
The 57-inch cord on some models gives some flexibility, but a cramped back gap can trap heat and shorten the microwave’s life.
References & Sources
- KitchenAid. “Microwave Dimensions Guide.” Supports sizing, 30-inch cutout, and low-profile 1.1 cu. ft. guidance.
- GE Appliances. “GE Monogram ZEM115SJSS Spec Sheet.” Supports exterior dimensions, 800 watts, and cord and weight details.
- GE Appliances. “GE JES1139WL Installation Page.” Identifies the model as a 1.1 cu. ft. countertop microwave.
