Best Microwaves Under 21 Inches Wide
Tight on space? These countertop and OTR microwaves fit in openings narrower than 21 inches — complete with clearance dimensions so you know exactly how much room you need.
366 models compared
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Enter your cabinet or counter dimensions below — we'll calculate the exact fit score for every model including manufacturer-required ventilation clearances.
Physical Specs
Required Space
Internal Features
Select required features
366 microwaves found
Breville
BMO870BSS1BUC1 (1.1 cu ft), countertop
20 1/2" Wx12 5/8" Hx20 1/8" D
Manufacturer Required Clearances
Clearances
4"
Top
4"
Each Side
4"
Back
1.5"
Door Swing
1"
Vent Gap
Breville
BMO850BSS1BUC1 (1.2 cu ft), countertop
20 3/8" Wx12 1/2" Hx19" D
Manufacturer Required Clearances
Clearances
4"
Top
4"
Each Side
4"
Back
1.5"
Door Swing
1"
Vent Gap
KitchenAid
KMML550RPS (1.1 cu ft), countertop
17" Wx9 5/8" Hx15 5/8" D
Manufacturer Required Clearances
Clearances
0"
Top
0"
Each Side
0"
Back
0"
Door Swing
1"
Vent Gap
Café
CVM519P2PS1 (1.9 cu ft), otr
19" Wx18" Hx30" D
Manufacturer Required Clearances
Clearances
0"
Top
0"
Each Side
0"
Back
0"
Door Swing
0"
Vent Gap
Sharp
SMC1461KW (1.4 cu ft), countertop
20 3/8" Wx12 3/8" Hx16 3/4" D
Manufacturer Required Clearances
Clearances
3"
Top
3"
Each Side
3"
Back
1.5"
Door Swing
1"
Vent Gap
GE
GCST10A1WSS (1.0 cu ft), countertop
20 5/8" Wx11 7/8" Hx16 5/8" D
Manufacturer Required Clearances
Clearances
3"
Top
0"
Each Side
1"
Back
1.5"
Door Swing
1"
Vent Gap
GE
JES1109RRSS (1.0 cu ft), countertop
20 5/8" Wx11 7/8" Hx16 5/8" D
Manufacturer Required Clearances
Clearances
3"
Top
0"
Each Side
1"
Back
1.5"
Door Swing
1"
Vent Gap
Café
CVM521P2MS1 (2.1 cu ft), otr
19" Wx18" Hx30" D
Manufacturer Required Clearances
Clearances
0"
Top
0"
Each Side
0"
Back
0"
Door Swing
0"
Vent Gap
Chefman
RJ55-11-V2 (1.1 cu ft), countertop
20 1/8" Wx12" Hx14 1/2" D
Manufacturer Required Clearances
Clearances
3"
Top
3"
Each Side
3"
Back
1.5"
Door Swing
1"
Vent Gap
KoolMore
KM-MOT-2SS (1.9 cu ft), otr
17 1/2" Wx16 1/2" Hx29 7/8" D
Manufacturer Required Clearances
Clearances
0"
Top
0"
Each Side
0"
Back
0"
Door Swing
0"
Vent Gap
Sharp
ZSMC1161KB (1.1 cu ft), countertop
20 5/8" Wx11 3/4" Hx14 3/4" D
Manufacturer Required Clearances
Clearances
3"
Top
3"
Each Side
3"
Back
1.5"
Door Swing
1"
Vent Gap
Café
CSB912P2VS1 (1.7 cu ft), built-in
27" Wx50 5/8" Hx27 1/2" D
Manufacturer Required Clearances
Clearances
0"
Top
0"
Each Side
0"
Back
0"
Door Swing
0"
Vent Gap
Café
CWB713P2VS1 (1.7 cu ft), countertop
15 1/2" Wx10 7/8" Hx15 1/2" D
Manufacturer Required Clearances
Clearances
0"
Top
0"
Each Side
0"
Back
0"
Door Swing
1"
Vent Gap
Café
CVM517P2RS1 (1.7 cu ft), otr
29 7/8" Wx16 5/16" Hx17 15/16" D
Manufacturer Required Clearances
Clearances
0"
Top
0"
Each Side
0"
Back
0"
Door Swing
0"
Vent Gap
Café
CVM517P3RD1 (1.7 cu ft), otr
19" Wx18" Hx30" D
Manufacturer Required Clearances
Clearances
0"
Top
0"
Each Side
0"
Back
0"
Door Swing
0"
Vent Gap
How to use this list
Every model listed here includes the physical dimensions (what you measure at the store) and the manufacturer-required clearances (the breathing room the unit needs around it). Most sites only show physical dimensions, which leads to returns — a 20" wide microwave needs 20" plus 3" on each side, so your cabinet needs to be at least 26" wide.
Use the MicrowaveFit calculator to enter your exact space and get a Fit Score for each model before you buy.
Not sure what you need?
The buying guide hub has curated lists by price, plate size, location, and use case.